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Offline Medical Wikipedia
[edit]By Kmcpesh
[edit]- 17-beta-hydroxysteroid dehydrogenase deficiency
- 17q21.31 microdeletion syndrome
- 1p36 deletion syndrome
- 2-Hydroxyglutaric aciduria
- 2q37 monosomy
- 3 hydroxyisobutyric aciduria
- 3-hydroxy-3-methylglutaryl-CoA lyase deficiency
- 3-hydroxyacyl-coenzyme A dehydrogenase deficiency
- 3-M syndrome
- 3-Methylcrotonyl-CoA carboxylase deficiency
- 3-Methylglutaconic aciduria
- 3C syndrome
- 48, XXXX
- 49, XXXXX
- 49, XXXXY syndrome
- 5-alpha-reductase deficiency
- 6-Pyruvoyltetrahydropterin synthase deficiency
- 8p23.1 duplication syndrome
- 9q34 deletion syndrome
- Aagenaes syndrome
- Aarskog–Scott syndrome
- Aase syndrome
- Abasia
- ABCD syndrome
- Abdallat–Davis–Farrage syndrome
- Abdominal adhesion
- Abdominal aortic aneurysm
- Abdominal cramps
- Abdominal hernia
- Abdominal migraine
- Abdominal musculature absent with microphthalmia and joint laxity
- Abdominal pain
- Abdominal wall defect
- Abdominoplasty
- Aberrant subclavian artery
- Ablation
- Ablation of atrial fibrillation
- Ablative brain surgery
- Ablepharon macrostomia syndrome
- Abortion
- Abrasion
- Abrasion (dental)
- Abrasion (geology)
- Abrasion (mechanical)
- Abrasion (medical)
- Abruzzo–Erickson syndrome
- Abscess
- Absence of gluteal muscle
- Absence seizure
- Abyssinian tea
- Acanthocheilonemiasis
- Acanthocyte
- Acanthosis nigricans
- Acatalasia
- Accessory navicular bone
- Accessory pancreas
- Achalasia
- Achard syndrome
- Achard–Thiers syndrome
- Ache
- Acheiropodia
- Achilles tendon
- Achilles tendon rupture
- Achondrogenesis
- Achondrogenesis type 1B
- Achondrogenesis type 2
- Achondroplasia
- Achondroplastic dwarfism
- Achromatopsia
- Acitretin
- Ackerman syndrome
- Acne aestivalis
- Acne conglobata
- Acne cosmetica
- Acne fulminans
- Acne keloidalis nuchae
- Acne mechanica
- Acne medicamentosa
- Acne miliaris necrotica
- Acne scars
- Acne vulgaris
- Acne with facial edema
- Acneiform eruption
- Acneiform rash
- Acoustic neuroma
- Acquired brain injury
- Acquired Epileptic Aphasia (landau-kleffner syndrome)
- Acrocallosal syndrome
- Acrochordon
- Acrocyanosis
- Acrodermatitis
- Acrodermatitis enteropathica
- Acrodysostosis
- Acrofrontofacionasal dysostosis
- Acrogeria
- Acrokeratoelastoidosis of Costa
- Acromegaly
- Acromicric dysplasia
- Acropectoral syndrome
- Acrophobia
- Acrospiroma
- Actinic keratosis
- Actinism
- Actinomycosis
- Activated protein C resistance
- Acupuncture
- Acute (medicine)
- Acute compartment syndrome
- Acute hepatitis B
- Acute intermittent porphyria
- Acute kidney failure
- Acute kidney injury
- Acute lung injury
- Acute lymphoblastic leukemia
- Acute lymphocytic leukemia
- Acute megakaryoblastic leukemia
- Acute monocytic leukemia
- Acute myeloblastic leukemia
- Acute myeloblastic leukemia with maturation
- Acute myeloblastic leukemia without maturation
- Acute myeloid leukemia
- Acute myeloid leukemia M7
- Acute myelomonocytic leukemia
- Acute necrotizing ulcerative gingivitis
- Acute pancreatitis
- Acute porphyria
- Acute posterior multifocal placoid pigment epitheliopathy
- Acute promyelocytic leukemia
- Acute radiation syndrome
- Acute respiratory distress syndrome
- Acute tubular necrosis
- Adams–Nance syndrome
- Adams–Oliver syndrome
- Addison's disease
- Adducted thumb syndrome
- Adenine phosphoribosyltransferase deficiency
- Adenocarcinoma of the lung
- Adenoid
- Adenoid basal cell carcinoma
- Adenoid cystic carcinoma
- Adenoid hypertrophy
- Adenoid seborrheic keratosis
- Adenoid squamous-cell carcinoma
- Adenoidectomy
- Adenoiditis
- Adenoids
- Adenoma
- Adenomatous polyposis coli
- Adenomyosis
- Adenosine
- Adenosine deaminase deficiency
- Adenosine Monophosphate Deaminase Deficiency type 1
- Adenovirus infection
- Adenylosuccinate lyase deficiency
- Adhesion (medicine)
- Adie syndrome
- Adiposis dolorosa
- Adiposogenital dystrophy
- Adolescence
- Adrenal gland
- Adrenal gland disorder
- Adrenal insufficiency
- Adrenal tumor
- Adrenocortical carcinoma
- Adrenocortical hyperfunction
- Adrenocorticotropic hormone deficiency
- Adrenoleukodystrophy
- Adult attention deficit hyperactivity disorder
- Adult Brain Tumor
- Adult stem cell
- Adult-onset diabetes
- Adult-onset Still's disease
- Advanced sleep phase disorder
- Aerosinusitis
- Affordable Care Act
- African iron overload
- African trypanosomiasis
- Afro-textured hair
- Aganglionosis
- Age spots
- Age-related macular degeneration
- Agenesis of the corpus callosum
- Ageusia
- Aggressive fibromatosis
- Agnosia
- Agoraphobia
- Agranulocyte
- Agranulocytosis
- Agraphia
- Agraphobia
- Aicardi syndrome
- Aicardi–Goutières syndrome
- Aichmophobia
- AIDS-related lymphoma
- Ainhum
- Airsickness
- Airsickness bag
- ALAD porphyria
- Alagille syndrome
- Alanine transaminase
- Albinism
- Albinism–deafness syndrome
- Albright's hereditary osteodystrophy
- Alcaptonuria
- Alcohol abuse
- Alcohol dependence
- Alcohol dependence syndrome
- Alcohol intoxication
- Alcohol poisoning
- Alcohol withdrawal syndrome
- Alcohol-related dementia
- Alcoholic hepatitis
- Alcoholism
- Aldolase A deficiency
- Alice in Wonderland syndrome
- Alkaptonuria
- Allan–Herndon–Dudley syndrome
- Allergen immunotherapy
- Allergic asthma
- Allergic bronchopulmonary aspergillosis
- Allergic conjunctivitis
- Allergic contact dermatitis
- Allergic granulomatosis
- Allergic purpura
- Allergic reaction
- Allergic reactions to anaesthesia
- Allergic rhinitis
- Allergy
- Allergy shots
- Alopecia areata
- Alopecia areata totalis
- Alopecia areata universalis
- Alopecia contractures dwarfism mental retardation
- Alopecia totalis
- Alopecia universalis
- Alpers' disease
- Alpha 1-antitrypsin deficiency
- Alpha-1 antitrypsin deficiency panniculitis
- Alpha-1 proteinase inhibitor
- Alpha-1 related emphysema
- Alpha-fetoprotein
- Alpha-galactosidase
- Alpha-galactosidase A deficiency
- Alpha-mannosidosis
- Alpha-thalassemia
- Alpha-thalassemia mental retardation syndrome
- Alport syndrome
- ALS
- Alström syndrome
- ALT test
- Alternating hemiplegia
- Alternating hemiplegia of childhood
- Altitude sickness
- Alveolar capillary dysplasia
- Alveolar hydatid disease
- Alveolar osteitis
- Alveolar rhabdomyosarcoma
- Alveolar soft part sarcoma
- Alzheimer's disease
- Amblyopia
- Amelia (birth defect)
- Amelogenesis
- Amelogenesis imperfecta
- Amenorrhoea
- American trypanosomiasis
- Amino acid
- Aminolevulinic acid dehydratase deficiency porphyria
- AML
- Amnesia
- Amnesic shellfish poisoning
- Amniocentesis
- Amniotic band constriction
- Amniotic fluid
- Amoebiasis
- Amyloid
- Amyloidosis
- Amyloidosis, familial
- Amyotrophic lateral sclerosis
- Anal cancer
- Anal fissure
- Anal fistula
- Anal itching
- Anaphylactoid purpura
- Anaphylaxis
- Anaplasmosis
- Anaplastic large-cell lymphoma
- Anaplastic thyroid cancer
- Androgen insensitivity syndrome
- Anemia
- Anencephaly
- Aneurysm
- Aneurysm of heart
- Aneurysm of sinus of Valsalva
- Angioedema
- Angioimmunoblastic T-cell lymphoma
- Angiolipoma
- Angioma
- Angiomatosis
- Angiosarcoma
- Angiostrongyliasis
- Aniridia
- Aniridia ataxia renal agenesis psychomotor retardation
- Anisakis
- Ankylosing spondylitis
- Ankylosis
- Annular pancreas
- Annuloaortic ectasia
- Anodontia
- Anomic aphasia
- Anonychia
- Anophthalmia
- Anorchia
- Anorexia nervosa
- Anorgasmia
- Anotia
- Anterior horn disease
- Anterior segment mesenchymal dysgenesis
- Anterograde amnesia
- Anthrax
- Anti-mitochondrial antibody
- Anti-nuclear antibody
- Antimitochondrial antibody
- Antinuclear antibody
- Antiphospholipid syndrome
- Antisocial personality disorder
- Antisynthetase syndrome
- Antithrombin
- Antley–Bixler syndrome
- Anton–Babinski syndrome
- Aortic aneurysm
- Aortic dissection
- Aortic valve stenosis
- Aortic window
- Apert syndrome
- Aphalangia
- Aphthous stomatitis
- Aplasia
- Aplasia cutis congenita
- Aplastic anemia
- Apparent mineralocorticoid excess syndrome
- Appendicitis
- Apraxia
- Apudoma
- Aqueductal stenosis
- Arachnodactyly
- Arachnoid cyst
- Arachnoiditis
- Arakawa's syndrome II
- Arbovirus
- Ardalan–Shoja–Kiuru syndrome
- ARDS
- AREDYLD syndrome
- Argentine hemorrhagic fever
- Argininemia
- Argininosuccinic aciduria
- Arnold–Chiari malformation
- Aromatase deficiency
- Aromatase excess syndrome
- Arrhinia
- Arrhythmogenic right ventricular dysplasia
- Arsenic poisoning
- Arterial tortuosity syndrome
- Arteriovenous malformation
- Arteritis
- Arthritis
- Arthrogryposis
- Arthrogryposis–renal dysfunction–cholestasis syndrome
- Ascariasis
- Ascher's syndrome
- Ascites
- Aseptic meningitis
- Asherman's syndrome
- Ashman phenomenon
- Aspartylglucosaminuria
- Asperger syndrome
- Aspergillosis
- Asphyxiating thoracic dysplasia
- Asplenia
- Asplenia with cardiovascular anomalies
- Astasia-abasia
- Astasis
- Asthma
- Astigmatism (eye)
- Astraphobia
- Astrocytoma
- Astrovirus
- Asymmetric crying facies
- Ataxia
- Ataxia telangiectasia
- Atelectasis
- Atelosteogenesis, type II
- Atherosclerosis
- Athetosis
- Athlete's foot
- Atopic dermatitis
- Atresia
- Atrial myxoma
- Atrial septal defect
- Atrioventricular fistula
- Atrioventricular septal defect
- Atrophic vaginitis
- Atrophoderma
- Atrophy
- Attention deficit hyperactivity disorder
- Atypical pneumonia
- Auditory brainstem response
- Auditory processing disorder
- Autism
- Autoimmune hemolytic anemia
- Autoimmune hepatitis
- Autoimmune polyendocrine syndrome
- Autoimmune polyendocrine syndrome type 1
- Autoimmune polyendocrine syndrome type 2
- Autosomal dominant polycystic kidney
- Autosomal recessive polycystic kidney
- Avascular necrosis
- Avoidant personality disorder
- Ayazi syndrome
- B-cell chronic lymphocytic leukemia
- Babesiosis
- Bacillus cereus
- Bacterial pneumonia
- Bacterial vaginosis
- Balantidiasis
- Bangstad syndrome
- Bannayan–Riley–Ruvalcaba syndrome
- Banti's syndrome
- Barbiturate dependence
- Barbiturate overdose
- Bardet–Biedl syndrome
- Bare lymphocyte syndrome
- Bare lymphocyte syndrome 2
- Baritosis
- Barrett's esophagus
- Barth syndrome
- Bartonella
- Bartter syndrome
- Basal ganglia disease
- Basal-cell carcinoma
- Bathophobia
- Batten disease
- Bauxite fibrosis
- Bazex–Dupré–Christol syndrome
- Becker's muscular dystrophy
- Becker's nevus
- Beckwith–Wiedemann syndrome
- Behr syndrome
- Behçet's disease
- Bell's palsy
- Benign familial neonatal seizures
- Benign fasciculation syndrome
- Benign fibrous histiocytoma
- Benign lymphoepithelial lesion
- Benign paroxysmal positional vertigo
- Benign symmetric lipomatosis
- Benzodiazepine dependence
- Benzodiazepine overdose
- Benzodiazepine withdrawal syndrome
- Berdon syndrome
- Beriberi
- Bernard–Soulier syndrome
- Berylliosis
- Beta thalassemia
- Beta-ketothiolase deficiency
- Beta-mannosidosis
- Bethlem myopathy
- Bhaskar–Jagannathan syndrome
- Bicuspid aortic valve
- Biemond syndrome
- Biliary atresia
- Bilirubin
- Binder's syndrome
- Binswanger's disease
- Biotin deficiency
- Biotinidase deficiency
- Bipolar disorder
- Bipolar I disorder
- Bipolar II disorder
- Birdshot chorioretinopathy
- Birt–Hogg–Dubé syndrome
- Björnstad syndrome
- BK virus
- Black Death
- Black hairy tongue
- Black piedra
- Bladder cancer
- Bladder exstrophy
- Blastoma
- Blastomycosis
- Blepharitis
- Blepharophimosis
- Blepharophyma
- Blepharospasm
- Blood phobia
- Bloom syndrome
- Blount's disease
- Blue diaper syndrome
- Blue rubber bleb nevus syndrome
- Body dysmorphic disorder
- Boil
- Bolivian hemorrhagic fever
- Bone
- Bone marrow failure
- Bone tumor
- Boomerang dysplasia
- Borderline personality disorder
- Bothrops lanceolatus
- Botulism
- Bovine spongiform encephalopathy
- Bowen's disease
- Bowenoid papulosis
- Brachydactyly
- Brain tumor
- Branchio-oculo-facial syndrome
- Branchio-oto-renal syndrome
- Brazilian hemorrhagic fever
- Breast cancer
- Brief psychotic disorder
- Bright's disease
- Bronchiectasis
- Bronchiolitis obliterans
- Bronchiolitis obliterans organizing pneumonia
- Bronchitis
- Bronchopulmonary dysplasia
- Brown's syndrome
- Brown-Séquard syndrome
- Brucellosis
- Bruck syndrome
- Brunner syndrome
- Bubonic plague
- Budd–Chiari syndrome
- Bulimia nervosa
- Bullous pemphigoid
- Bunion
- Burkitt's lymphoma
- Burning mouth syndrome
- Bursitis
- Buruli ulcer
- Buschke–Ollendorff syndrome
- Byssinosis
- CADASIL syndrome
- Caffeine-induced sleep disorder
- Café au lait spot
- Calcinosis cutis
- Calciphylaxis
- Calculus (medicine)
- CAMFAK syndrome
- Campylobacteriosis
- Camurati–Engelmann disease
- Canavan disease
- Cancer
- Candida (fungus)
- Candidiasis
- Canga's bead symptom
- Canine distemper
- Cannabis dependence
- Capillary leak syndrome
- Caplan's syndrome
- Carcinoid syndrome
- Cardiac amyloidosis
- Cardiac arrest
- Cardiac dysrhythmia
- Cardiac tamponade
- Cardiofaciocutaneous syndrome
- Cardiomyopathy
- Caregiver syndrome
- Carney complex
- Carnitine palmitoyltransferase I deficiency
- Carnitine palmitoyltransferase II deficiency
- Carnitine-acylcarnitine translocase deficiency
- Carnosinemia
- Caroli disease
- Carotenosis
- Carotid artery dissection
- Carpal tunnel syndrome
- Carpenter syndrome
- Cartilage–hair hypoplasia
- Castleman's disease
- Cat eye syndrome
- Cat scratch disease
- Cataract
- Catecholaminergic polymorphic ventricular tachycardia
- Catel–Manzke syndrome
- Caudal regression syndrome
- Cavernous hemangioma
- Cavernous sinus thrombosis
- Cenani–Lenz syndactylism
- Central core disease
- Central serous retinopathy
- Centronuclear myopathy
- Cerebellar hypoplasia
- Cerebral amyloid angiopathy
- Cerebral arteriovenous malformation
- Cerebral hypoxia
- Cerebral palsy
- Cerebrotendineous xanthomatosis
- Cervical cancer
- Chagas disease
- Chalazion
- Chancroid
- Charcot disease
- Charcot–Marie–Tooth disease
- CHARGE syndrome
- Cheilitis
- Chemophobia
- Cherubism
- Chickenpox
- Chikungunya
- Chilblains
- Child abuse
- Child sexual abuse
- CHILD syndrome
- Childhood amnesia
- Childhood disintegrative disorder
- Chimera (genetics)
- Chlamydia infection
- Chlamydia trachomatis
- Chlamydophila pneumoniae
- Cholangiocarcinoma
- Cholecystitis
- Cholemia
- Cholera
- Cholestasis
- Cholesteryl ester storage disease
- Chondroblastoma
- Chondrocalcinosis
- Chondrodysplasia punctata
- Chondrodystrophy
- Chondroma
- Chondromalacia patellae
- Chondrosarcoma
- Chordoma
- Chorea
- Chorea acanthocytosis
- Choriocarcinoma
- Chorioretinitis
- Choroid plexus cyst
- Choroid plexus papilloma
- Choroideremia
- Chromhidrosis
- Chromoblastomycosis
- Chromosome 15q partial deletion
- Chromosome 15q trisomy
- Chromosome 5q deletion syndrome
- Chronic fatigue syndrome
- Chronic granulomatous disease
- Chronic inflammatory demyelinating polyneuropathy
- Chronic kidney disease
- Chronic mountain sickness
- Chronic myelogenous leukemia
- Chronic myelomonocytic leukemia
- Chronic obstructive pulmonary disease
- Chronic progressive external ophthalmoplegia
- Chronic recurrent multifocal osteomyelitis
- Churg–Strauss syndrome
- Chédiak–Higashi syndrome
- Cicatricial pemphigoid
- Ciguatera
- Cinchonism
- Cirrhosis
- Citrullinemia
- Cleft lip and palate
- Cleidocranial dysostosis
- Cloacal exstrophy
- Clouston's hidrotic ectodermal dysplasia
- Club foot
- Cluster headache
- Coagulopathy
- Coalworker's pneumoconiosis
- Coarctation of the aorta
- Coats' disease
- Cocaine dependence
- Cocaine intoxication
- Coccidioidomycosis
- Cockayne syndrome
- Coeliac disease
- Coffin–Lowry syndrome
- Coffin–Siris syndrome
- Cogan syndrome
- Cohen syndrome
- Cold agglutinin disease
- Cold antibody hemolytic anemia
- Cold urticaria
- Colitis
- Collagenous colitis
- Coloboma
- Color blindness
- Colorado tick fever
- Colorectal cancer
- Combined hyperlipidemia
- Common cold
- Common variable immunodeficiency
- Compartment syndrome
- Complement component 2
- Complement receptor 1
- Complex regional pain syndrome
- Conduct disorder
- Conductive hearing loss
- Condylomata lata
- Cone dystrophy
- Congenital absence of the vas deferens
- Congenital adrenal hyperplasia
- Congenital adrenal hyperplasia due to 11β-hydroxylase deficiency
- Congenital adrenal hyperplasia due to 17 alpha-hydroxylase deficiency
- Congenital adrenal hyperplasia due to 21-hydroxylase deficiency
- Congenital adrenal hyperplasia due to 3 beta-hydroxysteroid dehydrogenase deficiency
- Congenital afibrinogenemia
- Congenital amputation
- Congenital cataract
- Congenital contractural arachnodactyly
- Congenital cytomegalovirus infection
- Congenital diaphragmatic hernia
- Congenital disorder of glycosylation
- Congenital dyserythropoietic anemia
- Congenital dyserythropoietic anemia type I
- Congenital dyserythropoietic anemia type II
- Congenital dyserythropoietic anemia type III
- Congenital fiber type disproportion
- Congenital generalized lipodystrophy
- Congenital heart defect
- Congenital hemolytic anemia
- Congenital hepatic fibrosis
- Congenital hyperinsulinism
- Congenital hypoplastic anemia
- Congenital hypothyroidism
- Congenital ichthyosiform erythroderma
- Congenital insensitivity to pain with anhidrosis
- Congenital lymphedema
- Congenital melanocytic nevus
- Congenital myopathy
- Congenital nephrotic syndrome
- Congenital pulmonary airway malformation
- Congenital rubella syndrome
- Congenital self-healing reticulohistiocytosis
- Congenital syphilis
- Conjunctivitis
- Conn's syndrome
- Connective tissue disease
- Conradi–Hünermann syndrome
- Constitutional growth delay
- Contact dermatitis
- Conversion disorder
- Cooks syndrome
- Cor pulmonale
- Cor triatriatum
- Corneal dystrophy
- Cornelia de Lange Syndrome
- Corneodermatoosseous syndrome
- Coronary artery aneurysm
- Coronary artery disease
- Cortical dysplasia
- Corticobasal degeneration
- Costello syndrome
- Costochondritis
- Cowden syndrome
- Cowpox
- Crab louse
- Cramp
- Cramp fasciculation syndrome
- Crandall syndrome
- Craniodiaphyseal dysplasia
- Craniofrontonasal dysplasia
- Craniosynostosis
- Creatine
- CREST syndrome
- Cretinism
- Creutzfeldt–Jakob disease
- Cri du chat
- Crigler–Najjar syndrome
- CRLF1
- Crohn's disease
- Crome syndrome
- Cronkhite–Canada syndrome
- Croup
- Crouzon syndrome
- Crouzonodermoskeletal syndrome
- Cryoglobulinemia
- Cryptococcosis
- Cryptosporidiosis
- Crystal arthropathy
- Currarino syndrome
- Cushing's syndrome
- Cutaneous larva migrans
- Cutaneous lymphoid hyperplasia
- Cutaneous small-vessel vasculitis
- Cutaneous T cell lymphoma
- Cutis laxa
- Cutis marmorata telangiectatica congenita
- Cutis verticis gyrata
- Cyclic neutropenia
- Cyclic vomiting syndrome
- Cyclosporiasis
- Cyclothymia
- Cystic fibrosis
- Cystic hygroma
- Cysticercosis
- Cystinosis
- Cystinuria
- Cytochrome c oxidase
- Cytomegalovirus
- D-Glyceric acidemia
- Daentl Towsend Siegel syndrome
- Dahlberg Borer Newcomer syndrome
- Dandy–Walker syndrome
- Darier's disease
- De Barsy syndrome
- Death anxiety (psychology)
- Deep vein thrombosis
- Degos disease
- Dejerine–Roussy syndrome
- Dejerine–Sottas disease
- Delayed ejaculation
- Delayed sleep phase disorder
- Delirium
- Delirium tremens
- Delusional disorder
- Dementia
- Dementia pugilistica
- Dementia with Lewy bodies
- Demyelinating disease
- Dengue fever
- Dent's disease
- Dental abscess
- Dental caries
- Dental fluorosis
- Dental phobia
- Dentatorubral-pallidoluysian atrophy
- Dentin dysplasia
- Dentinogenesis imperfecta
- Dependent personality disorder
- Depersonalization disorder
- Depressive personality disorder
- Dermabrasion
- Dermatitis
- Dermatitis herpetiformis
- Dermatographic urticaria
- Dermatomyositis
- Dermatopathia pigmentosa reticularis
- Dermatophytid
- Dermatophytosis
- Dermoodontodysplasia
- DeSanctis–Cacchione syndrome
- Desmin-related myofibrillar myopathy
- Desmoplastic small-round-cell tumor
- Developmental coordination disorder
- Dextrocardia
- Diabetes insipidus
- Diabetes mellitus
- Diabetes mellitus and deafness
- Diabetes mellitus type 1
- Diabetes mellitus type 2
- Diabetic angiopathy
- Diabetic nephropathy
- Diabetic neuropathy
- Diabetic retinopathy
- Diamond–Blackfan anemia
- Diaper rash
- Diarrhetic shellfish poisoning
- Diastematomyelia
- Diastrophic dysplasia
- Dicarboxylic aminoaciduria
- Diethylstilbestrol
- Diffuse idiopathic skeletal hyperostosis
- Diffuse large B-cell lymphoma
- Diffuse neonatal hemangiomatosis
- Diffuse panbronchiolitis
- DiGeorge syndrome
- Digoxin
- Digoxin toxicity
- Dihydropyrimidine dehydrogenase deficiency
- Dilated cardiomyopathy
- Diphallia
- Diphtheria
- Diphyllobothrium
- Diplopia
- Disaccharidase
- Discoid lupus erythematosus
- Disease
- Disinhibited attachment disorder
- Dislocation of hip
- Dissociative disorder
- Dissociative identity disorder
- Distal 18q-
- Distal muscular dystrophy
- Distal renal tubular acidosis
- Distal Trisomy 10q
- Diverticulitis
- Diverticulosis
- Donnai–Barrow syndrome
- Donohue syndrome
- DOOR syndrome
- Dopamine beta hydroxylase deficiency
- Double outlet right ventricle
- Down syndrome
- Doxorubicin
- Dracunculiasis
- Drug-induced amnesia
- Duane syndrome
- Dubin–Johnson syndrome
- Dubowitz syndrome
- Duchenne muscular dystrophy
- Duodenal atresia
- Dupuytren's contracture
- Dwarfism
- Dysautonomia
- Dysbarism
- Dyscalculia
- Dyschromatosis universalis hereditaria
- Dysferlinopathy
- Dysfibrinogenemia
- Dysgerminoma
- Dysgeusia
- Dysgraphia
- Dyskeratosis congenita
- Dyskinesia
- Dyslexia
- Dysostosis
- Dyspareunia
- Dysplasia
- Dysplastic nevus syndrome
- Dysthymia
- Dystonia
- Early-onset Alzheimer's disease
- Ebola virus disease
- Echinococcosis
- Echovirus
- Ectodermal dysplasia
- Ectopia cordis
- Ectopia lentis
- Ectopic pregnancy
- Ectrodactyly
- Ectrodactyly–ectodermal dysplasia–cleft syndrome
- Edwards syndrome
- EEM syndrome
- Effects of cannabis
- Egg allergy
- Ehlers–Danlos syndrome
- Ehrlichiosis
- Ehrlichiosis ewingii infection
- Eiken syndrome
- Eisenmenger's syndrome
- Ekbom syndrome
- Elective mutism
- Elejalde syndrome
- Elephantiasis
- Ellis–van Creveld syndrome
- Emery–Dreifuss muscular dystrophy
- Emetophobia
- Empty sella syndrome
- Encephalitis
- Encephalitis lethargica
- Encephalocele
- Encephalomyelitis
- Enchondromatosis
- Encopresis
- Endocardial fibroelastosis
- Endocarditis
- Endocrinology
- Endodermal sinus tumor
- Endometrial ablation
- Endometrial stromal sarcoma
- Endometriosis
- Endosalpingiosis
- Enolase deficiency
- Enterobiasis
- Entomophthoramycosis
- Enuresis
- Eosinophilia–myalgia syndrome
- Eosinophilic cellulitis
- Eosinophilic cystitis
- Eosinophilic fasciitis
- Eosinophilic folliculitis
- Eosinophilic gastroenteritis
- Eosinophilic granuloma
- Eosinophilic pneumonia
- Ependymoma
- Epicondylitis
- Epidermodysplasia verruciformis
- Epidermolysis bullosa
- Epidermolysis bullosa acquisita
- Epidermolysis bullosa dystrophica
- Epidermolytic hyperkeratosis
- Epididymitis
- Epilepsia partialis continua
- Epilepsy
- Epileptic spasms
- Epithelial-myoepithelial carcinoma
- Equinophobia
- Erb's palsy
- Erdheim–Chester disease
- Ergophobia
- Erosive pustular dermatitis of the scalp
- Erysipelas
- Erythema multiforme
- Erythema nodosum
- Erythroblastopenia
- Erythroderma
- Erythrokeratodermia variabilis
- Erythrokeratodermia with ataxia
- Erythromelalgia
- Erythroplakia
- Erythroplasia of Queyrat
- Erythropoietic protoporphyria
- Erythrotelangiectatic rosacea
- Esophageal atresia
- Esophageal cancer
- Esophageal varices
- Esophagus
- Esophoria
- Esotropia
- Essential fatty acid
- Essential fructosuria
- Essential hypertension
- Essential thrombocythaemia
- Essential tremor
- Esthesioneuroblastoma
- Evans syndrome
- Ewing's sarcoma
- Exanthema subitum
- Excoriated acne
- Exencephaly
- Exophoria
- Exophthalmos
- Exostosis
- Exotropia
- Experimental autoimmune encephalomyelitis
- Exploding head syndrome
- Extramammary Paget's disease
- Eye movement
- Fabry disease
- FACES syndrome
- Facial cleft
- Facial nerve paralysis
- Facioscapulohumeral muscular dystrophy
- Factor IX
- Factor V
- Factor V Leiden
- Factor VII
- Factor X
- Factor XI
- Factor XII
- Factor XIII
- Factor XIII deficiency
- Fahr's syndrome
- Familial adenomatous polyposis
- Familial aortic dissection
- Familial British dementia
- Familial dysautonomia
- Familial dysbetalipoproteinemia
- Familial hemiplegic migraine
- Familial hypertriglyceridemia
- Familial isolated vitamin E deficiency
- Familial male-limited precocious puberty
- Familial Mediterranean fever
- Familial partial lipodystrophy
- Fan death
- Fanconi anemia
- Fanconi syndrome
- Farber disease
- Farmer's lung
- Fasciolosis
- Fatal familial insomnia
- Fatty liver
- Fazio–Londe disease
- Fear of bees
- Fear of daylight
- Fear of fish
- Fear of frogs
- Fear of mice
- Fear of needles
- Febrile neutrophilic dermatosis
- Febrile seizure
- Fechtner syndrome
- Feingold syndrome
- Felty's syndrome
- Female sexual arousal disorder
- Femur fibula ulna syndrome
- Ferroportin
- Fetal alcohol syndrome
- Fetal hydantoin syndrome
- Fetal trimethadione syndrome
- Fetal warfarin syndrome
- FG syndrome
- Fibrochondrogenesis
- Fibrodysplasia ossificans progressiva
- Fibroma
- Fibromatosis
- Fibromuscular dysplasia
- Fibromyalgia
- Fibrosarcoma
- Fibrosis
- Fibrous dysplasia of bone
- Fifth disease
- Filariasis
- Fish-eye disease
- Fissured tongue
- Fitz-Hugh–Curtis syndrome
- Fitzsimmons–Guilbert syndrome
- Flat feet
- Floater
- Floating-Harbor syndrome
- Fluorosis
- Flynn–Aird syndrome
- Focal dermal hypoplasia
- Focal dystonia
- Focal facial dermal dysplasia
- Foix–Alajouanine syndrome
- Foix–Chavany–Marie syndrome
- Folie à deux
- Follicular lymphoma
- Follicular thyroid cancer
- Foodborne illness
- Foreign accent syndrome
- Formaldehyde
- Fountain syndrome
- Fournier gangrene
- Fox–Fordyce disease
- Fragile X syndrome
- Franceschetti–Klein syndrome
- Fraser syndrome
- Frasier syndrome
- Freeman–Sheldon syndrome
- Freiberg disease
- Frey's syndrome
- Friedreich's ataxia
- Frontonasal dysplasia
- Frontotemporal dementia
- Fructose 1,6-bisphosphatase
- Fucosidosis
- Fugue state
- Fukuyama congenital muscular dystrophy
- Fumarase deficiency
- Galactocele
- Galactokinase deficiency
- Galactorrhea
- Galactorrhea hyperprolactinemia
- Galactose epimerase deficiency
- Galactose-1-phosphate uridylyltransferase deficiency
- Galactosemia
- Galactosialidosis
- Galloway Mowat syndrome
- Gallstone
- Ganglioglioma
- Gangliosidosis
- Ganser syndrome
- GAPO syndrome
- Gardner's syndrome
- Gastric antral vascular ectasia
- Gastric dumping syndrome
- Gastric lymphoma
- Gastrocutaneous syndrome
- Gastroenteritis
- Gastroesophageal reflux disease
- Gastrointestinal cancer
- Gastrointestinal stromal tumor
- Gastroschisis
- Gaucher's disease
- Gender identity disorder
- Generalised epilepsy
- Generalized anxiety disorder
- Genital wart
- Genu varum
- Genuphobia
- Geographic tongue
- Gerodermia osteodysplastica
- Gerstmann syndrome
- Gestational diabetes
- Gestational pemphigoid
- Gestational trophoblastic disease
- Gianotti–Crosti syndrome
- Giant axonal neuropathy
- Giant platelet disorder
- Giant-cell arteritis
- Giardiasis
- Gigantism
- Gilbert's syndrome
- Gingivitis
- Gitelman syndrome
- GJB2
- Glandular rosacea
- Glanzmann's thrombasthenia
- Glaucoma
- Glioblastoma multiforme
- Glioma
- Gliomatosis cerebri
- Gliosarcoma
- Glomerulonephritis
- Glomerulosclerosis
- Glossophobia
- Glucagonoma
- Glucocorticoid deficiency 1
- Glucose-6-phosphate dehydrogenase deficiency
- Glucose-galactose malabsorption
- Glutamate flavoring
- Glutaric aciduria type 1
- Glutathione synthetase deficiency
- Gluten-sensitive enteropathy-associated conditions
- Glycine encephalopathy
- Glycogen storage disease
- Glycogen storage disease type 0
- Glycogen storage disease type I
- Glycogen storage disease type II
- Glycogen storage disease type III
- Glycogen storage disease type IV
- Glycogen storage disease type V
- Glycogen storage disease type VI
- Glycogen storage disease type XI
- Glycosuria
- GM1 gangliosidoses
- GM2 gangliosidoses
- GMS syndrome
- Gnathophyma
- Goitre
- Goldenhar syndrome
- Gonadal dysgenesis
- Goodpasture syndrome
- Gorham's disease
- Gougerot–Blum syndrome
- Gout
- Graft-versus-host disease
- Gram-negative rosacea
- Granulocyte
- Granuloma annulare
- Granulomatosis with polyangiitis
- Granulomatous facial dermatitis
- Graves' disease
- Gray platelet syndrome
- Group B streptococcal infection
- Growth hormone deficiency
- Guanidinoacetate methyltransferase deficiency
- Guillain–Barré syndrome
- Gunther disease
- Gymnophobia
- Gynecomastia
- Haemochromatosis type 3
- Haemophilia
- Haemophilia A
- Haemophilia B
- Haemophilia C
- Hagemoser–Weinstein–Bresnick syndrome
- Hailey–Hailey disease
- Hair disease
- Hair loss
- Hairy cell leukemia
- Hairy palms and soles
- Hajdu–Cheney syndrome
- Halal syndrome
- Hallermann–Streiff syndrome
- Hallucinogen persisting perception disorder
- Halogen acne
- Hamartoma
- Hand, foot and mouth disease
- Hand–Schüller–Christian disease
- Hantavirus hemorrhagic fever with renal syndrome
- Harding ataxia
- Harlequin-type ichthyosis
- Harpaxophobia
- Hartnup disease
- Hashimoto's thyroiditis
- Hawkinsinuria
- Hay–Wells syndrome
- Hearing loss
- Heart block
- Heart failure
- Heavy metal (chemistry)
- HEC syndrome
- Heliophobia
- HELLP syndrome
- Helminthiasis
- Hemangioblastoma
- Hemangioendothelioma
- Hemangioma
- Hemangiopericytoma
- Hemifacial microsomia
- Hemiplegia
- Hemoglobin C
- Hemoglobin E
- Hemoglobinopathy
- Hemoglobinuria
- Hemolytic-uremic syndrome
- Hemophagocytic lymphohistiocytosis
- Hemorrhoid
- Hemosiderosis
- Hemothorax
- Hennekam syndrome
- Henoch–Schönlein purpura
- Hepadnaviridae
- Heparin-induced thrombocytopenia
- Hepatic encephalopathy
- Hepatic veno-occlusive disease
- Hepatitis
- Hepatitis A
- Hepatitis B
- Hepatitis B virus
- Hepatitis C
- Hepatitis D
- Hepatitis E
- Hepatoblastoma
- Hepatocellular carcinoma
- Hepatorenal syndrome
- Hereditary angioedema
- Hereditary breast–ovarian cancer syndrome
- Hereditary coproporphyria
- Hereditary elliptocytosis
- Hereditary fructose intolerance
- Hereditary hemorrhagic telangiectasia
- Hereditary inclusion body myopathy
- Hereditary mucoepithelial dysplasia
- Hereditary multiple exostoses
- Hereditary nonpolyposis colorectal cancer
- Hereditary pancreatitis
- Hereditary pyropoikilocytosis
- Hereditary spastic paraplegia
- Hereditary spherocytosis
- Hereditary stomatocytosis
- Hermansky–Pudlak syndrome
- Hermaphrodite
- Hernia
- Herpangina
- Herpes B virus
- Herpes of the eye
- Herpes simplex
- Herpes simplex virus
- Herpes zoster
- Herpesviral encephalitis
- Herpesviridae
- Herpetophobia
- Heterophoria
- HFE hereditary haemochromatosis
- Hiccup
- Hidradenitis suppurativa
- High-altitude pulmonary edema
- Hip dysplasia (canine)
- Hip dysplasia (human)
- Hirschsprung's disease
- Histidinemia
- Histoplasmosis
- Histrionic personality disorder
- HIV
- HIV-associated neurocognitive disorder
- HIV/AIDS
- Hodgkin's lymphoma
- Holocarboxylase synthetase deficiency
- Holoprosencephaly
- Holt–Oram syndrome
- Homocystinuria
- Homophobia
- Hookworm
- Horner's syndrome
- Horseshoe kidney
- Hot tub folliculitis
- Howel–Evans syndrome
- HOXA13
- Ho–Kaufman–Mcalister syndrome
- Human granulocytic anaplasmosis
- Human monocytotropic ehrlichiosis
- Hunter syndrome
- Huntington's disease
- Hurler syndrome
- Hutchinson's teeth
- Hydranencephaly
- Hydrocephalus
- Hydrolethalus syndrome
- Hydronephrosis
- Hydrops fetalis
- Hydrops-ectopic calcification-moth-eaten skeletal dysplasia
- Hymenolepiasis
- Hyper IgM syndrome
- Hyper-IgD syndrome
- Hyperaldosteronism
- Hyperammonemia
- Hyperandrogenism
- Hypercalcaemia
- Hypercalciuria
- Hypercementosis
- Hypercholesterolemia
- Hyperekplexia
- Hypereosinophilic syndrome
- Hypergeusia
- Hyperglycemia
- Hyperglycerolemia
- Hyperglycinemia
- Hyperhidrosis
- Hyperhomocysteinemia
- Hyperimmunoglobulin E syndrome
- Hyperkalemia
- Hyperkalemic periodic paralysis
- Hyperkeratosis
- Hyperlipidemia
- Hyperlysinemia
- Hypermethioninemia
- Hypermobility
- Hyperopia
- Hyperostosis frontalis interna
- Hyperoxaluria
- Hyperparathyroidism
- Hyperphenylalaninemia
- Hyperprolactinaemia
- Hyperprolinemia
- Hyperreflexia
- Hypersensitivity
- Hypersensitivity pneumonitis
- Hypersomnia
- Hypertension
- Hypertensive nephropathy
- Hypertensive retinopathy
- Hyperthermia
- Hyperthyroidism
- Hypertrichosis
- Hypertriglyceridemia
- Hypertrophic cardiomyopathy
- Hypertropia
- Hypertryptophanemia
- Hyperuricemia
- Hypervalinemia
- Hypervitaminosis A
- Hypervitaminosis D
- Hypervitaminosis E
- Hypoactive sexual desire disorder
- Hypoaldosteronism
- Hypobetalipoproteinemia
- Hypocalcaemia
- Hypochondriasis
- Hypochondrogenesis
- Hypochondroplasia
- Hypodermyasis
- Hypodontia
- Hypogammaglobulinemia
- Hypoglycemia
- Hypogonadism
- Hypohidrotic ectodermal dysplasia
- Hypokalemia
- Hypokalemic periodic paralysis
- Hypokalemic sensory overstimulation
- Hypokinesia
- Hypolipoproteinemia
- Hypoparathyroidism
- Hypophosphatasia
- Hypopituitarism
- Hypoplastic left heart syndrome
- Hypoprothrombinemia
- Hypospadias
- Hypothermia
- Hypothyroidism
- Hypotonia
- Hypotrichosis
- Hypoxia (medical)
- I-cell disease
- Ichthyoallyeinotoxism
- Ichthyosis
- Ichthyosis acquisita
- Ichthyosis bullosa of Siemens
- Ichthyosis follicularis with alopecia and photophobia syndrome
- Ichthyosis linearis circumflexa
- Ichthyosis vulgaris
- Idiopathic facial aseptic granuloma
- Idiopathic giant-cell myocarditis
- Idiopathic intracranial hypertension
- Idiopathic pulmonary fibrosis
- Idiopathic pulmonary haemosiderosis
- Idiopathic sclerosing mesenteritis
- Idiopathic thrombocytopenic purpura
- IgA nephropathy
- Iminoglycinuria
- Immunodeficiency–centromeric instability–facial anomalies syndrome
- Imperforate anus
- Impetigo
- Impossible syndrome
- Inborn error of metabolism
- Inborn errors of renal tubular transport
- Incidentaloma
- Inclusion body myositis
- Incontinentia pigmenti
- Incontinentia pigmenti achromians
- Indometacin
- Infant respiratory distress syndrome
- Infantile acne
- Infantile cortical hyperostosis
- Infantile digital fibromatosis
- Infantile free sialic acid storage disease
- Infantile myofibromatosis
- Infantile neuroaxonal dystrophy
- Infantile neuronal ceroid lipofuscinosis
- Infantile Refsum disease
- Infectious mononucleosis
- Infective endocarditis
- Inflammatory breast cancer
- Influenza
- Ingrown nail
- Inguinal hernia
- Insulinoma
- Intellectual disability
- Intermediate uveitis
- Interrupted aortic arch
- Intersex
- Interstitial cystitis
- Interstitial lung disease
- Intestinal atresia
- Intestinal pseudoobstruction
- Intestinal spirochetosis
- Intoxicative inhalant
- Intracranial aneurysm
- Intraocular lymphoma
- Iodine
- Iodine deficiency
- Iridocorneal endothelial syndrome
- Iridogoniodysgenesis, dominant type
- Iron deficiency
- Iron overload
- Irritable bowel syndrome
- Irritant contact dermatitis
- Irritant diaper dermatitis
- Isosporiasis
- Isotretinoin
- Isovaleric acidemia
- Jackson–Weiss syndrome
- Jacobsen syndrome
- Jalili syndrome
- Jansky–Bielschowsky disease
- Japanese encephalitis
- Jervell and Lange-Nielsen syndrome
- Johanson–Blizzard syndrome
- John Langdon Down
- Johnson–Munson syndrome
- Joubert syndrome
- Jumping Frenchmen of Maine
- Junctional ectopic tachycardia
- Junctional epidermolysis bullosa (medicine)
- Juvenile dermatomyositis
- Juvenile hemochromatosis
- Juvenile hyaline fibromatosis
- Juvenile idiopathic arthritis
- Juvenile myoclonic epilepsy
- Juvenile osteoporosis
- Kabuki syndrome
- Kallmann syndrome
- Kaposi's sarcoma
- Kapur–Toriello syndrome
- Kasabach–Merritt syndrome
- Katz syndrome
- Kaufman oculocerebrofacial syndrome
- Kawasaki disease
- Kearns–Sayre syndrome
- Keloid
- Keratitis–ichthyosis–deafness syndrome
- Keratoacanthoma
- Keratoconjunctivitis sicca
- Keratoconus
- Keratolytic winter erythema
- Keratomalacia
- Keratosis follicularis spinulosa decalvans
- Keratosis pilaris
- Keratosis pilaris atrophicans faciei
- Kerion
- Kernicterus
- Keutel syndrome
- Khat
- Kidney stone
- Kikuchi disease
- Kimura's disease
- Kindler syndrome
- Kjer's optic neuropathy
- Kleine–Levin syndrome
- Klinefelter syndrome
- Klippel–Feil syndrome
- Klippel–Trénaunay syndrome
- Klumpke paralysis
- Klüver–Bucy syndrome
- Kniest dysplasia
- Kocher–Debre–Semelaigne syndrome
- Kohlschütter-Tönz syndrome
- Koilonychia
- Koro (medicine)
- Korsakoff's syndrome
- Kostmann syndrome
- Kowarski syndrome
- Krabbe disease
- Kuru (disease)
- Kwashiorkor
- Kyasanur forest disease
- Kyphosis
- Köhler disease
- Labyrinthine fistula
- Labyrinthitis
- Lachiewicz–Sibley syndrome
- Lacunar amnesia
- Lafora disease
- Lambert–Eaton myasthenic syndrome
- Lamellar ichthyosis
- Landau–Kleffner syndrome
- Langerhans cell histiocytosis
- Langer–Giedion syndrome
- Large for gestational age
- Laron syndrome
- Larsen syndrome
- Laryngeal cancer
- Laryngeal cleft
- Laryngeal papillomatosis
- Laryngocele
- Laryngomalacia
- Lassa fever
- Late termination of pregnancy
- Lattice corneal dystrophy
- Lead poisoning
- Leaky gut syndrome
- Leber's congenital amaurosis
- Leber's hereditary optic neuropathy
- Lecithin cholesterol acyltransferase deficiency
- Left ventricular hypertrophy
- Legg–Calvé–Perthes syndrome
- Legionnaires' disease
- Leigh's disease
- Leiner's disease
- Leiomyoma
- Leiomyosarcoma
- Leishmaniasis
- Lemierre's syndrome
- Lennox–Gastaut syndrome
- Lenz microphthalmia syndrome
- Leprosy
- Leptospirosis
- Leri pleonosteosis
- Lesch–Nyhan syndrome
- Lethal congenital contracture syndrome
- Letterer–Siwe disease
- Leukemia
- Leukocyte adhesion deficiency
- Leukodystrophy
- Leukoplakia
- Levator ani
- Levo-Transposition of the great arteries
- Lhermitte–Duclos disease
- Lichen myxedematosus
- Lichen planus
- Lichen sclerosus
- Lichen spinulosus
- Liddle's syndrome
- Light chain deposition disease
- Limb-girdle muscular dystrophy
- Lipid pneumonia
- Lipodystrophy
- Lipoid congenital adrenal hyperplasia
- Lipoprotein lipase deficiency
- Liposarcoma
- Lissencephaly
- List of cutaneous conditions
- List of diseases (A)
- List of diseases (G)
- List of phobias
- Listeriosis
- Livedoid dermatitis
- Liver spot
- Li–Fraumeni syndrome
- Loa loa filariasis
- Locked-in syndrome
- Loeys–Dietz syndrome
- Loin pain hematuria syndrome
- Long QT syndrome
- Long-chain 3-hydroxyacyl-coenzyme A dehydrogenase deficiency
- Loose anagen syndrome
- Lowry–MacLean syndrome
- Lucey–Driscoll syndrome
- Lujan–Fryns syndrome
- Lumbar spinal stenosis
- Lung cancer
- Lupoid rosacea
- Lupus anticoagulant
- Lupus erythematosus
- Lupus miliaris disseminatus faciei
- Lyme disease
- Lymphangiectasia
- Lymphangioleiomyomatosis
- Lymphangioma
- Lymphatic filariasis
- Lymphedema
- Lymphedema–distichiasis syndrome
- Lymphoblastic lymphoma
- Lymphocytic colitis
- Lymphocytopenia
- Lymphoma
- Lymphomatoid granulomatosis
- Lymphomatoid papulosis
- Lyngstadaas syndrome
- Lysinuric protein intolerance
- Lysosomal storage disease
- Léri–Weill dyschondrosteosis
- Macroglobulinemia
- Macroglossia
- Macrophagic myofasciitis
- Macular corneal dystrophy
- Macular degeneration
- Macular hypoplasia
- Maffucci syndrome
- Majewski's polydactyly syndrome
- Major depressive disorder
- Mal de debarquement
- Malakoplakia
- Malaria
- Malignant hyperthermia
- Malignant peripheral nerve sheath tumor
- Malignant rhabdoid tumour
- Mallory–Weiss syndrome
- Malonyl-CoA decarboxylase deficiency
- Malouf syndrome
- Malpuech facial clefting syndrome
- Mandibuloacral dysplasia
- Mange
- Mannosidosis
- Mansonelliasis
- Mantle cell lymphoma
- Maple syrup urine disease
- Marburg virus disease
- Marchiafava–Bignami disease
- Marcus Gunn phenomenon
- Marden–Walker syndrome
- Marek's disease
- Marfan syndrome
- Marfanoid
- Marinesco–Sjögren syndrome
- Maroteaux–Lamy syndrome
- Marshall–Smith syndrome
- MASA syndrome
- Mass psychogenic illness
- Mastocytosis
- Mastoiditis
- Maturity onset diabetes of the young
- May–Hegglin anomaly
- McCune–Albright syndrome
- McGillivray syndrome
- McKusick–Kaufman syndrome
- Meadow's syndrome
- Measles
- Meckel syndrome
- Mediastinitis
- Medication phobia
- Medicine
- Medium-chain acyl-coenzyme A dehydrogenase deficiency
- Medullary cystic kidney disease
- Medullary sponge kidney
- Medullary thyroid cancer
- Medulloblastoma
- Megaduodenum
- Megalencephaly
- Megaloblastic anemia
- Megaureter
- Meige's syndrome
- MELAS syndrome
- Meleda disease
- Melioidosis
- Melkersson–Rosenthal syndrome
- Melnick–Needles syndrome
- Meningioma
- Meningitis
- Meningococcal disease
- Menkes disease
- Mercury poisoning
- MERRF syndrome
- Mesenteric ischemia
- Mesoblastic nephroma
- Mesothelioma
- Metabolic acidosis
- Metabolic syndrome
- Metachondromatosis
- Metachromatic leukodystrophy
- Metageria
- Methemoglobinemia
- Methylmalonic acidemia
- Methylmalonyl-CoA mutase deficiency
- Methylmercury
- Metophyma
- Mevalonate kinase deficiency
- Michelin tire baby syndrome
- Michels Caskey syndrome
- Michels syndrome
- Mickleson syndrome
- Micro syndrome
- Microcephaly
- Microcephaly lymphoedema chorioretinal dysplasia
- Microcoria
- Micrognathism
- Microphthalmia
- Microphthalmia–dermal aplasia–sclerocornea syndrome
- Microscopic polyangiitis
- Microsporidiosis
- Microtia
- Microvillous inclusion disease
- Migraine
- Mild cognitive impairment
- Miller syndrome
- Miller–Dieker syndrome
- Milroy's disease
- Minamata disease
- Minimally differentiated acute myeloblastic leukemia
- Mirhosseini–Holmes–Walton syndrome
- Miscarriage
- Mismatch repair cancer syndrome
- Mitochondrial disease
- Mitochondrial trifunctional protein deficiency
- Mitral valve prolapse
- Mitral valve stenosis
- Mixed connective tissue disease
- Mixed gonadal dysgenesis
- Mixed Müllerian tumor
- Mixed receptive-expressive language disorder
- MN1 (gene)
- Mohr–Tranebjærg syndrome
- Molar pregnancy
- Molluscum contagiosum
- Molybdenum cofactor deficiency
- MOMO syndrome
- Mondini dysplasia
- Mondor's disease
- Monilethrix
- Monochromacy
- Monoclonal gammopathy of undetermined significance
- Morel's ear
- Morgellons
- Morphea
- Morquio syndrome
- Motor neuron disease
- Movement disorder
- Moyamoya disease
- Muckle–Wells syndrome
- Mucolipidosis type IV
- Mucopolysaccharidosis
- Mucormycosis
- Muenke syndrome
- Mulibrey nanism
- Multicentric reticulohistiocytosis
- Multifocal motor neuropathy
- Multiple chemical sensitivity
- Multiple endocrine neoplasia type 1
- Multiple endocrine neoplasia type 2
- Multiple epiphyseal dysplasia
- Multiple myeloma
- Multiple organ dysfunction syndrome
- Multiple pterygium syndrome
- Multiple sclerosis
- Multiple sulfatase deficiency
- Multiple system atrophy
- Mumps
- Muscle atrophy
- Muscular dystrophy
- Myasthenia gravis
- Mycetoma
- Mycobacterium avium-intracellulare infection
- Mycosis fungoides
- Myelin
- Myelitis
- Myelodysplastic syndrome
- Myelofibrosis
- Myeloid leukemia
- Myeloid sarcoma
- Myeloperoxidase deficiency
- Myhre syndrome
- Myiasis
- Myocardial infarction
- Myocarditis
- Myoclonic dystonia
- Myoclonic epilepsy
- Myoclonus
- Myoglobinuria
- Myopathy
- Myopathy, X-linked, with excessive autophagy
- Myopia
- Myositis
- Myositis ossificans
- Myotonia congenita
- Myotonic dystrophy
- Mysophobia
- Myxedema
- Myxoid liposarcoma
- Myxozoa
- Ménière's disease
- Ménétrier's disease
- Möbius syndrome
- Müllerian agenesis
- Münchausen syndrome
- Münchausen syndrome by proxy
- N-Acetylglutamate synthase deficiency
- Naegeli–Franceschetti–Jadassohn syndrome
- Nager acrofacial dysostosis
- Nail–patella syndrome
- Nakajo syndrome
- Nance–Horan syndrome
- Narcissistic personality disorder
- Narcolepsy
- Nasodigitoacoustic syndrome
- Nasopharynx cancer
- Naxos syndrome
- Necrophilia
- Necrotizing fasciitis
- Neisseria gonorrhoeae
- Neisseria meningitidis
- Nelson's syndrome
- Nemaline myopathy
- Neonatal acne
- Neonatal diabetes mellitus
- Neonatal hemochromatosis
- Neonatal hepatitis
- Neonatal herpes simplex
- Neonatal jaundice
- Neonatal onset multisystem inflammatory disease
- Nephrocalcinosis
- Nephrogenic diabetes insipidus
- Nephronophthisis
- Nephropathy
- Nephrotic syndrome
- Nerve sheath tumor
- Nesidioblastosis
- Netherton syndrome
- Neural tube defect
- Neurasthenia
- Neuroacanthocytosis
- Neuroblastoma
- Neurocutaneous melanosis
- Neuroendocrine tumor
- Neurofibrillary tangle
- Neurofibroma
- Neurofibromatosis
- Neurofibromatosis type 3
- Neurofibromatosis type 4
- Neurofibromatosis type I
- Neurofibromatosis type II
- Neurogenic diabetes insipidus
- Neuroleptic malignant syndrome
- Neuromyelitis optica
- Neuromyotonia
- Neuronal ceroid lipofuscinosis
- Neurosyphilis
- Neurotoxic shellfish poisoning
- Neurotoxicity
- Neurulation
- Neutral lipid storage disease
- Neutropenia
- Nevoid basal cell carcinoma syndrome
- Nevus sebaceous
- Nezelof syndrome
- Nicolaides–Baraitser syndrome
- Nicotine withdrawal
- Niemann–Pick disease
- Niemann–Pick disease, type C
- Nijmegen breakage syndrome
- Nissen fundoplication
- Nocardiosis
- Noise-induced hearing loss
- Noma (disease)
- Non-24-hour sleep–wake disorder
- Non-Hodgkin lymphoma
- Non-Langerhans cell histiocytosis
- Non-small-cell lung carcinoma
- Nonvenereal endemic syphilis
- Nonverbal learning disorder
- Noonan syndrome
- Norman–Roberts syndrome
- Norrie disease
- Northern epilepsy syndrome
- Nose-picking
- Notalgia paresthetica
- Nyctalopia
- Nyctophobia
- Nystagmus
- Obesophobia
- Obsessive–compulsive disorder
- Obsessive–compulsive personality disorder
- Obstructive sleep apnea
- Occipital horn syndrome
- Occupational acne
- Occupational asthma
- Occupational lung disease
- Ochronosis
- Ocular albinism
- Ocular rosacea
- Oculocerebrocutaneous syndrome
- Oculocerebrorenal syndrome
- Oculocutaneous albinism type I
- Oculodentodigital dysplasia
- Oculomotor nerve palsy
- Oculopharyngeal muscular dystrophy
- Odontoma
- Ogilvie syndrome
- Oikophobia
- Oil acne
- Olfactory reference syndrome
- Oligodactyly
- Oliver–McFarlane syndrome
- Olivopontocerebellar atrophy
- Ollier disease
- Olney's lesions
- Ombrophobia
- Omenn syndrome
- Omsk hemorrhagic fever
- Onchocerciasis
- Oncocytoma
- Ondine's curse
- Oneirophobia
- Onychogryphosis
- Onycholysis
- Onychomadesis
- Onychomatricoma
- Onychomycosis
- Onychophosis
- Opioid dependence
- Opioid-induced hyperalgesia
- Opportunistic infection
- Oppositional defiant disorder
- Opsismodysplasia
- Optic disc drusen
- Optic nerve hypoplasia
- Optic neuritis
- Optic neuropathy
- Oral cancer
- Oral submucous fibrosis
- Organic acidemia
- Organic brain syndrome
- Organophosphate poisoning
- Ornithine aminotransferase deficiency
- Ornithine translocase deficiency
- Orofaciodigital syndrome 1
- Orotic aciduria
- Orthomolecular medicine
- Orthostatic hypotension
- Orthostatic intolerance
- Osgood–Schlatter disease
- OSLAM syndrome
- Osmophobia
- Osteoarthritis
- Osteochondritis
- Osteochondritis dissecans
- Osteochondrodysplasia
- Osteochondroma
- Osteogenesis imperfecta
- Osteomalacia
- Osteomyelitis
- Osteopetrosis
- Osteopoikilosis
- Osteoporosis
- Osteosarcoma
- Osteosclerosis
- Otitis externa
- Otodental syndrome
- Otolaryngology
- Otophyma
- Otosclerosis
- Otospondylomegaepiphyseal dysplasia
- Ovarian cancer
- Overwhelming post-splenectomy infection
- Oxycephaly
- Pachygyria
- Pachyonychia congenita
- Pacman dysplasia
- Paget's disease of bone
- Paget's disease of the breast
- Painful bruising syndrome
- Palindromic rheumatism
- Pallister–Hall syndrome
- Pallister–Killian syndrome
- Palmoplantar keratoderma
- Pancreas
- Pancreas divisum
- Pancreatic cancer
- Pancreatoblastoma
- PANDAS
- Panic attack
- Panic disorder
- Panniculitis
- Panphobia
- Pantothenate kinase-associated neurodegeneration
- Papillary thyroid cancer
- Papilledema
- Papillitis
- Papillon–Lefèvre syndrome
- Papular mucinosis
- Paracetamol
- Paracetamol toxicity
- Paracoccidioidomycosis
- Paraganglioma
- Paralytic shellfish poisoning
- Paramyotonia congenita
- Paranasal sinuses
- Paraneoplastic cerebellar degeneration
- Paranoid personality disorder
- Paraphilia
- Paraplegia
- Parapsoriasis
- Parastremmatic dwarfism
- Parathyroid carcinoma
- Parathyroid neoplasm
- Paratyphoid fever
- Paresis
- Parkes Weber syndrome
- Parkinson's disease
- Parkinsonism
- Paronychia
- Paroxysmal cold hemoglobinuria
- Paroxysmal nocturnal hemoglobinuria
- Paroxysmal nonkinesigenic dyskinesia
- Parry–Romberg syndrome
- Parsonage–Turner syndrome
- Paruresis
- Parvovirus
- Parvovirus B19
- Pashayan syndrome
- Passive-aggressive behavior
- Patau syndrome
- Patent ductus arteriosus
- Pathogenic Escherichia coli
- Patient Protection and Affordable Care Act
- Patterson syndrome
- Peanut allergy
- Pediculosis
- Pediculosis corporis
- Peeling skin syndrome
- PEHO syndrome
- Pelizaeus–Merzbacher disease
- Pellagra
- Pelvic inflammatory disease
- Pelvic lipomatosis
- Pemphigus
- Pemphigus foliaceus
- Pemphigus vulgaris
- Pendred syndrome
- Penile agenesis and testicular agenesis
- Pentalogy of Cantrell
- Pentosuria
- Peptic ulcer
- Perifolliculitis capitis abscedens et suffodiens
- Perinatal asphyxia
- Periodic fever, aphthous stomatitis, pharyngitis and adenitis
- Periodic limb movement disorder
- Periodic paralysis
- Periodontal abscess
- Periodontal pathology
- Periodontitis
- Perioral dermatitis
- Periorbital dermatitis
- Periorificial dermatitis
- Peripartum cardiomyopathy
- Peripheral neuropathy
- Peripheral T-cell lymphoma
- Peritonitis
- Peritonsillar abscess
- Periventricular leukomalacia
- Permanent neonatal diabetes mellitus
- Pernicious anemia
- Peroxisomal disorder
- Persistent edema of rosacea
- Persistent genital arousal disorder
- Persistent truncus arteriosus
- Pertussis
- Peters-plus syndrome
- Peutz–Jeghers syndrome
- Peyronie's disease
- Pfeiffer syndrome
- PHACES Syndrome
- Phakomatosis pigmentokeratotica
- Phakomatosis pigmentovascularis
- Phenylketonuria
- Phenytoin
- Pheochromocytoma
- Phocomelia
- Phonophobia
- Phosphofructokinase deficiency
- Phosphoglucomutase
- Phosphoglycerate kinase
- Photosensitive epilepsy
- Phymatous rosacea
- Physical abuse
- Physical urticaria
- Phytophotodermatitis
- Pica (disorder)
- Pick's disease
- Pickardt syndrome
- Piebaldism
- Pierre Marie
- Pierre Robin syndrome
- Pigeon toe
- Pigment dispersion syndrome
- Pigmented villonodular synovitis
- Pili annulati
- Pili multigemini
- Pili torti
- Pilocytic astrocytoma
- Pilonidal cyst
- Pilotto syndrome
- Pinealoma
- Pinta (disease)
- Pipecolic acidemia
- Pira
- Pitt–Hopkins syndrome
- Pityriasis lichenoides chronica
- Pityriasis lichenoides et varioliformis acuta
- Pityriasis rubra pilaris
- Placental abruption
- Placental disease
- Plague (disease)
- Plantar fibromatosis
- Platelet
- Pleomorphic undifferentiated sarcoma
- Pleural effusion
- Pleurisy
- Pleuropulmonary blastoma
- Plum syndrome
- Plummer–Vinson syndrome
- Pneumoconiosis
- Pneumocystis pneumonia
- Pneumocystosis
- Pneumonic plague
- Pneumonoultramicroscopicsilicovolcanoconiosis
- Pneumothorax
- POEMS syndrome
- Pogosta disease
- Poland syndrome
- Poliomyelitis
- Polyarteritis nodosa
- Polyarthritis
- Polycystic kidney disease
- Polycystic ovary syndrome
- Polycythemia vera
- Polydactyly
- Polymorphous low-grade adenocarcinoma
- Polymyalgia rheumatica
- Polymyositis
- Polyneuropathy
- Polyomaviridae
- Polyploid
- Polyradiculoneuropathy
- Popliteal pterygium syndrome
- Porencephaly
- Porokeratosis
- Porphyria
- Porphyria cutanea tarda
- Portal hypertension
- Portal vein thrombosis
- Post-polio syndrome
- Post-traumatic epilepsy
- Posterior urethral valve
- Postpartum depression
- Posttraumatic stress disorder
- Potassium-aggravated myotonia
- Potter sequence
- Poxviridae
- Prader–Willi syndrome
- Pre-eclampsia
- Precocious puberty
- Prekallikrein
- Premature ovarian failure
- Premature ventricular contraction
- Premenstrual dysphoric disorder
- Presbycusis
- Presbyopia
- Presumed ocular histoplasmosis syndrome
- Primary aldosteronism
- Primary biliary cirrhosis
- Primary ciliary dyskinesia
- Primary cutaneous amyloidosis
- Primary hyperoxaluria
- Primary hyperparathyroidism
- Primary hypertrophic osteoathropathy
- Primary lateral sclerosis
- Primary polydipsia
- Primary progressive aphasia
- Primary sclerosing cholangitis
- Primary tumors of the heart
- Primitive neuroectodermal tumor
- Primordial dwarfism
- Primrose syndrome
- Prinzmetal's angina
- Problem gambling
- Procrastination
- Proctitis
- Progeria
- Progeroid syndromes
- Progressive familial intrahepatic cholestasis
- Progressive multifocal leukoencephalopathy
- Progressive muscular atrophy
- Progressive myoclonus epilepsy
- Progressive osseous heteroplasia
- Progressive supranuclear palsy
- Progressive systemic sclerosis
- Prolidase deficiency
- Proliferating trichilemmal cyst
- Prolymphocytic leukemia
- Promoter (genetics)
- Properdin deficiency
- Propionic acidemia
- Prosopamnesia
- Prostate cancer
- Prostatitis
- Protein C deficiency
- Protein S deficiency
- Protein–energy malnutrition
- Proteus syndrome
- Proximal renal tubular acidosis
- Prune belly syndrome
- Prurigo nodularis
- Pruritus ani
- Pseudo-Hurler polydystrophy
- Pseudoachondroplasia
- Pseudocholinesterase deficiency
- Pseudohermaphroditism
- Pseudohypoaldosteronism
- Pseudohypoparathyroidism
- Pseudomonas aeruginosa
- Pseudomonas infection
- Pseudomonas oryzihabitans
- Pseudomonas stutzeri
- Pseudomyxoma peritonei
- Pseudopelade of Brocq
- Pseudovaginal perineoscrotal hypospadias
- Pseudoxanthoma elasticum
- Psittacosis
- Psoriasis
- Psychogenic amnesia
- Psychological abuse
- Psychosis
- Psychosomatic medicine
- Pterygium
- Ptosis
- Puerperal fever
- Pulmonary alveolar proteinosis
- Pulmonary hypertension
- Pulmonary sequestration
- Pulmonary valve stenosis
- Pulmonic stenosis
- Pure red cell aplasia
- Purine nucleoside phosphorylase deficiency
- Purpura
- Pyaemia
- Pycnodysostosis
- Pyelonephritis
- Pyoderma faciale
- Pyoderma gangrenosum
- Pyomyositis
- Pyridoxine deficiency
- Pyrophobia
- Pyrosis
- Pyruvate carboxylase deficiency
- Pyruvate dehydrogenase deficiency
- Pyruvate kinase deficiency
- Q fever
- Qazi–Markouizos syndrome
- Quadrantanopia
- Quadriceps tendon rupture
- Quebec platelet disorder
- Queensland tick typhus
- Rabies
- Rabson–Mendenhall syndrome
- Radiofrequency ablation
- Radiophobia
- Raine syndrome
- Ramos-Arroyo syndrome
- Ramsay Hunt syndrome
- Ramsay Hunt syndrome type II
- Raoul Bensaude
- Rapadilino syndrome
- Rapp–Hodgkin syndrome
- Rapunzel syndrome
- Rasmussen's encephalitis
- Raynaud's phenomenon
- Reactive airway disease
- Reactive arthritis
- Reactive attachment disorder
- Reactive hypoglycemia
- Refsum disease
- Relapsing polychondritis
- Renal agenesis
- Renal artery stenosis
- Renal cell carcinoma
- Renal dysplasia-limb defects syndrome
- Renal failure
- Renal glycosuria
- Renal osteodystrophy
- Renal tubular acidosis
- Renovascular hypertension
- Reperfusion injury
- Repetitive strain injury
- Respiratory acidosis
- Restless legs syndrome
- Restrictive cardiomyopathy
- Reticulated seborrheic keratosis
- Reticulocytopenia
- Retina
- Retinitis pigmentosa
- Retinoblastoma
- Retinopathy
- Retinopathy of prematurity
- Retinoschisis
- Retrograde amnesia
- Retroperitoneal fibrosis
- Rett syndrome
- Revesz syndrome
- Reye syndrome
- Reynolds syndrome
- Rh disease
- Rhabditida
- Rhabdomyolysis
- Rhabdomyosarcoma
- Rheumatic fever
- Rheumatism
- Rheumatoid arthritis
- Rheumatoid factor
- Rheumatoid vasculitis
- Rhinophyma
- Richter's transformation
- Rickets
- Rickettsialpox
- Rickettsiosis
- Rift Valley fever
- Ring 18
- Ring chromosome 20 syndrome
- Roberts syndrome
- Robinow syndrome
- Rocker bottom foot
- Rocky Mountain spotted fever
- Romano–Ward syndrome
- Rombo syndrome
- Rosacea
- Rosacea conglobata
- Rosai–Dorfman disease
- Rosselli–Gulienetti syndrome
- Rothmund–Thomson syndrome
- Rotor syndrome
- Roussy–Lévy syndrome
- Rubella
- Rubinstein–Taybi syndrome
- Rudiger syndrome
- Rumination syndrome
- Ruzicka Goerz Anton syndrome
- Saal Bulas syndrome
- Saal Greenstein syndrome
- Sabinas brittle hair syndrome
- Saccharopinuria
- Sacral plexus
- Sadistic personality disorder
- Saethre–Chotzen syndrome
- Sakati–Nyhan–Tisdale syndrome
- Salivary gland
- Salla disease
- Salmonellosis
- Sandhoff disease
- Sanfilippo syndrome
- SAPHO syndrome
- Sarcoidosis
- Sarcoma botryoides
- Sarcosinemia
- Satoyoshi syndrome
- Say–Meyer syndrome
- Scabies
- Scalp–ear–nipple syndrome
- Scar tissue
- Scar Tissue
- SCARF syndrome
- Scarlet fever
- Schamberg disease
- Scheie syndrome
- Scheuermann's disease
- Schindler disease
- Schinzel–Giedion syndrome
- Schistosomiasis
- Schizencephaly
- Schizoaffective disorder
- Schizoid personality disorder
- Schizophrenia
- Schizophreniform disorder
- Schizotypal personality disorder
- Schmitt Gillenwater Kelly syndrome
- Schwannomatosis
- Schwartz–Jampel syndrome
- Sciatica
- Scimitar syndrome
- Scleredema
- Scleroderma
- Sclerostin
- Scoliosis
- Scopophobia
- Scotoma
- Scott syndrome
- Scrapie
- Scurvy
- Sea-blue histiocytosis
- Seasonal affective disorder
- Seaver Cassidy syndrome
- Seborrheic keratosis
- Secernentea
- Seckel syndrome
- Selective immunoglobulin A deficiency
- Selective mutism
- Selective serotonin reuptake inhibitor
- Selenium
- Self-defeating personality disorder
- Seminoma
- Senescence
- Senior–Løken syndrome
- Sensenbrenner syndrome
- Sensorineural hearing loss
- Sensory processing disorder
- Senter syndrome
- Separation anxiety disorder
- Sepsis
- Septic arthritis
- Septic shock
- Septicemic plague
- Septo-optic dysplasia
- Serpentine fibula-polycystic kidney syndrome
- Serum sickness
- Setleis syndrome
- Severe acute respiratory syndrome
- Severe combined immunodeficiency
- Sex chromosome disorders
- Sex linkage
- Sexually transmitted disease
- Shapiro syndrome
- Sheehan's syndrome
- Shellfish poisoning
- Shigellosis
- Shock (circulatory)
- Short bowel syndrome
- Short QT syndrome
- Short rib – polydactyly syndrome
- SHORT syndrome
- Short-chain acyl-coenzyme A dehydrogenase deficiency
- Shwachman–Diamond syndrome
- Shwartzman phenomenon
- Sialadenitis
- Sialidosis
- Sialuria
- Sickle-cell disease
- Sideroblastic anemia
- Siderosis
- Silent sinus syndrome
- Silicosis
- Silver–Russell syndrome
- Simpson–Golabi–Behmel syndrome
- Singleton Merten syndrome
- Sirenomelia
- Sitosterolemia
- Situs ambiguus
- Situs inversus
- Sixth nerve palsy
- Sjögren's syndrome
- Sjögren–Larsson syndrome
- Sleepwalking
- Sly syndrome
- Small cleaved cells
- Small-cell carcinoma
- Smallpox
- Smith–Fineman–Myers syndrome
- Smith–Lemli–Opitz syndrome
- Smith–Magenis syndrome
- Sneddon's syndrome
- Social anxiety disorder
- Soft-tissue sarcoma
- Somatization disorder
- Somatostatinoma
- Sotos syndrome
- Source amnesia
- Spasmodic dysphonia
- Spasmodic torticollis
- Specific phobia
- Spermatogenesis arrest
- Spherocytosis
- Sphingolipidoses
- Spina bifida
- Spinal and bulbar muscular atrophy
- Spinal cord injury
- Spinal muscular atrophies
- Spinal muscular atrophy
- Spinal muscular atrophy with progressive myoclonic epilepsy
- Spinal shock
- Spinal stenosis
- Spinal tumor
- Spinocerebellar ataxia
- Spirochaete
- Spirurida
- Splenic disease
- Splenic flexure syndrome
- Splenomegaly
- Spondylitis
- Spondyloarthropathy
- Spondylocostal dysostosis
- Spondyloepimetaphyseal dysplasia
- Spondyloepiphyseal dysplasia congenita
- Sporotrichosis
- Spotted fever
- Sprengel's deformity
- Squamous-cell carcinoma
- St. Anthony's fire
- Staphylococcal infection
- Staphylococcal scalded skin syndrome
- Staphylococcus aureus
- Staphylococcus epidermidis
- Steatocystoma multiplex
- Sternal cleft
- Steroid rosacea
- Stevens–Johnson syndrome
- Stickler syndrome
- Stiff person syndrome
- Stiff skin syndrome
- Stimmler syndrome
- Stimulant psychosis
- Stomach cancer
- Stomatitis
- Strabismus
- Stratton Parker syndrome
- Streptococcal pharyngitis
- Strongyloidiasis
- Strychnine poisoning
- Stucco keratosis
- Sturge–Weber syndrome
- Stye
- Subacute sclerosing panencephalitis
- Subvalvular aortic stenosis (non-human)
- Succinic semialdehyde dehydrogenase deficiency
- Succinyl-CoA:3-oxoacid CoA transferase deficiency
- Sucrose intolerance
- Sudden cardiac death
- Sudden infant death syndrome
- Sugarman syndrome
- Sulfite oxidase
- Superior mesenteric artery syndrome
- Susac's syndrome
- Swine influenza
- Sydenham's chorea
- Syncope (medicine)
- Syndactyly
- Syndrome of inappropriate antidiuretic hormone secretion
- Synechia (eye)
- Synesthesia
- Synovial osteochondromatosis
- Synovial sarcoma
- Synovitis
- Synpolydactyly
- Syphilis
- Syringobulbia
- Syringocystadenoma papilliferum
- Syringoma
- Syringomyelia
- Systemic lupus erythematosus
- Systemic primary carnitine deficiency
- Systemic scleroderma
- Sézary's disease
- T-cell acute lymphoblastic leukemia
- T-cell lymphoma
- T-cell prolymphocytic leukemia
- Tachycardia
- Taeniasis
- Takayasu's arteritis
- Tangier disease
- Tar acne
- TAR syndrome
- Tardive dyskinesia
- Tarsal tunnel syndrome
- Taurodontism
- Tay–Sachs disease
- Telangiectasia
- Temporal lobe epilepsy
- Temporomandibular joint dysfunction
- Teratoma
- Testicular cancer
- Tetanus
- Tethered spinal cord syndrome
- Tetrahydrobiopterin deficiency
- Tetralogy of Fallot
- Tetraplegia
- Thalassemia
- Thalidomide
- Thin basement membrane disease
- Thoracic outlet syndrome
- Thrombin
- Thromboangiitis obliterans
- Thrombocytopenia
- Thrombocytosis
- Thrombotic thrombocytopenic purpura
- Thrombus
- Thymic carcinoma
- Thymoma
- Thyroglossal cyst
- Thyroid cancer
- Thyroid dysgenesis
- Thyroid hormone resistance
- Tibialis posterior muscle
- Tick paralysis
- Tick-borne encephalitis
- Tietz syndrome
- Tietze syndrome
- Tinnitus
- TNF receptor associated periodic syndrome
- Todd's paresis
- Togaviridae
- Tokophobia
- Tolosa–Hunt syndrome
- Toluene toxicity
- Tooth and nail syndrome
- Tooth fusion
- Torsades de pointes
- Torticollis
- Tourette syndrome
- Townes–Brocks syndrome
- Toxic epidermal necrolysis
- Toxic shock syndrome
- Toxiphobia
- Toxocariasis
- Toxoplasmic chorioretinitis
- Toxoplasmosis
- Tracheal agenesis
- Tracheobronchomalacia
- Tracheobronchomegaly
- Tracheoesophageal fistula
- Trachoma
- Transient acantholytic dermatosis
- Transient erythroblastopenia of childhood
- Transient global amnesia
- Transient neonatal diabetes mellitus
- Transitional cell carcinoma
- Transmissible spongiform encephalopathy
- Transposition of the great vessels
- Transthyretin-related hereditary amyloidosis
- Transverse myelitis
- Treacher Collins syndrome
- Tree nut allergy
- Tremor
- Treponema pallidum
- Trevor disease
- Trichinosis
- Tricho-hepato-enteric syndrome
- Trichofolliculoma
- Trichomoniasis
- Trichostasis spinulosa
- Trichothiodystrophy
- Trichotillomania
- Tricho–dento–osseous syndrome
- Tricuspid atresia
- Tricyclic antidepressant overdose
- Trigeminal neuralgia
- Trigger finger
- Trigonocephaly
- Trimethylaminuria
- Triosephosphate isomerase deficiency
- Triple X syndrome
- Triple-A syndrome
- Triploid syndrome
- Trisomy
- Trisomy 16
- Trisomy 22
- Trisomy 8
- Trisomy 9
- Tropical acne
- Tropical spastic paraparesis
- Tropical sprue
- Tsukuhara syndrome
- Tuber cinereum hamartoma
- Tuberculosis
- Tuberculous meningitis
- Tuberous sclerosis
- Tufted angioma
- Tularemia
- Tummy tuck
- Tungiasis
- Turner syndrome
- Twin-to-twin transfusion syndrome
- Type I hypersensitivity
- Type I tyrosinemia
- Type II hypersensitivity
- Type III hypersensitivity
- Type IV hypersensitivity
- Typhoid fever
- Typhus
- Tyrosinemia
- Tyrosinemia type II
- Uhl anomaly
- Ulcerative colitis
- Ulnar–mammary syndrome
- Umbilical cord ulceration and intestinal atresia
- Uncombable hair syndrome
- Uniparental disomy
- Unsafe abortion
- Unverricht–Lundborg disease
- Upington disease
- Urachal cancer
- Urachal cyst
- Urbach–Wiethe disease
- Urban–Rogers–Meyer syndrome
- Urea cycle disorder
- Uremia
- Uridine monophosphate synthetase
- Urinary system
- Urocanic aciduria
- Urofacial syndrome
- Urticaria
- Urticaria pigmentosa
- Urticarial vasculitis
- Usher syndrome
- Uvea
- Uveal melanoma
- Uveitis
- Vaccine controversies
- VACTERL association
- Vaginismus
- Vaginitis
- Van der Woude syndrome
- Van Goethem syndrome
- Vancomycin-resistant Enterococcus
- Varicella zoster virus
- Variegate porphyria
- Vascular dementia
- Vasculitis
- Vasovagal response
- Vein of Galen aneurysmal malformations
- Velopharyngeal inadequacy
- Ventricular fibrillation
- Ventricular septal defect
- Ventricular system
- Vernal keratoconjunctivitis
- Vertically transmitted infection
- Very long-chain acyl-coenzyme A dehydrogenase deficiency
- Vestibular schwannoma
- Vestibulocochlear dysfunction progressive familial
- VIPoma
- Viral hemorrhagic fever
- Visual agnosia
- Vitamin B12 deficiency
- Vitamin B6
- Vitamin E deficiency
- Vitelliform macular dystrophy
- Vitiligo
- VLDLR-associated cerebellar hypoplasia
- Vogt–Koyanagi–Harada syndrome
- Von Hippel–Lindau disease
- Von Willebrand disease
- Vulvodynia
- Waardenburg syndrome
- Wagner's disease
- WAGR syndrome
- Waldenström's macroglobulinemia
- Waldmann disease
- Wallerian degeneration
- Wallis–Zieff–Goldblatt syndrome
- Wandering spleen
- Warfarin necrosis
- Warkany syndrome
- Wart
- Waterhouse–Friderichsen syndrome
- Watson syndrome
- Weaver syndrome
- Webbed neck
- Weill–Marchesani syndrome
- Weissenbacher–Zweymüller syndrome
- Werner syndrome
- Wernicke's encephalopathy
- Wernicke–Korsakoff syndrome
- West Nile virus
- Western equine encephalitis virus
- Wheat allergy
- Whipple's disease
- White sponge nevus
- Wiedemann-Rautenstrauch syndrome
- Wildervanck syndrome
- Williams syndrome
- Wilms' tumor
- Wilson's disease
- Wilson–Turner syndrome
- Winchester syndrome
- Wiskott–Aldrich syndrome
- Wolcott–Rallison syndrome
- Wolff–Parkinson–White syndrome
- Wolfram syndrome
- Wolf–Hirschhorn syndrome
- Wolman disease
- Woodhouse–Sakati syndrome
- Worster-Drought syndrome
- Worth syndrome
- Wrinkly skin syndrome
- Writer's cramp
- X-linked adrenal hypoplasia congenita
- X-linked agammaglobulinemia
- X-linked congenital stationary night blindness
- X-linked dominant inheritance
- X-linked hypophosphatemia
- X-linked ichthyosis
- X-linked intellectual disability
- X-linked lymphoproliferative disease
- X-linked recessive chondrodysplasia punctata
- X-linked severe combined immunodeficiency
- Xanthinuria
- Xeroderma
- Xeroderma pigmentosum
- Xerophthalmia
- Xerostomia
- XX gonadal dysgenesis
- XX male syndrome
- XXYY syndrome
- XY gonadal dysgenesis
- XYY syndrome
- Y chromosome
- Y chromosome microdeletion
- Yaws
- Yellow fever
- Yellow nail syndrome
- Yemenite deaf-blind hypopigmentation syndrome
- Yersinia enterocolitica
- Yersinia pestis
- Yersinia pseudotuberculosis
- Yersiniosis
- Yim–Ebbin syndrome
- Young's syndrome
- Young–Simpson syndrome
- Yunis–Varon syndrome
- Yushō disease
- Zadik–Barak–Levin syndrome
- Zamzam–Sheriff–Phillips syndrome
- ZAP70 deficiency
- Zellweger syndrome
- Zenker's diverticulum
- Zieve's syndrome
- Zimmermann–Laband syndrome
- Zinc deficiency
- Zinc toxicity
- Zollinger–Ellison syndrome
- Zonular cataract and nystagmus
- Zori–Stalker–Williams syndrome
- Zunich–Kaye syndrome
- Zuska's disease
- Zygomycosis