|Classification and external resources|
Inflamed oropharynx: swollen and red.
Pharyngitis (pron.: //) comes from the Greek word pharynx pharanx meaning throat and the suffix -itis meaning inflammation. It is an inflammation of the throat. In most cases it is quite painful, and is the most common cause of a sore throat.
Like many types of inflammation, pharyngitis can be acute – characterized by a rapid onset and typically a relatively short course – or chronic. Pharyngitis can result in very large tonsils which cause trouble swallowing and breathing. Pharyngitis can be accompanied by a cough or fever, for example, if caused by a systemic infection.
Most acute cases are caused by viral infections (40–80%), with the remainder caused by bacterial infections, fungal infections, or irritants such as pollutants or chemical substances. Treatment of viral causes are mainly symptomatic while bacterial or fungal causes may be amenable to antibiotics and anti-fungal respectively.
Pharyngitis is a type of inflammation, most commonly caused by an upper respiratory tract infection. It may be classified as acute or chronic. An acute pharyngitis may be catarrhal, purulent or ulcerative, depending on the virulence of the causative agent and the immune capacity of the affected individual. Chronic pharyngitis is the most common otolaringologic disease and may be catarrhal, hypertrophic or atrophic.
The majority of cases are due to an infectious organism acquired from close contact with an infected individual.
- Adenovirus – the most common of the viral causes. Typically the degree of neck lymph node enlargement is modest and the throat often does not appear red, although it is very painful.
- Orthomyxoviridae which cause influenza – present with rapid onset high temperature, headache and generalised ache. A sore throat may be associated.
- Infectious mononucleosis ("glandular fever") caused by the Epstein-Barr virus. This may cause significant lymph gland swelling and an exudative tonsillitis with marked redness and swelling of the throat. The heterophile test can be used if this is suspected.
- Herpes simplex virus can cause multiple mouth ulcers.
- Common cold: rhinovirus, coronavirus, respiratory syncytial virus, parainfluenza virus can cause infection of the throat, ear, and lungs causing standard cold-like symptoms and often extreme pain.
A number of different bacteria can infect the human throat. The most common is Group A streptococcus, however others include Corynebacterium diphtheriae, Neisseria gonorrhoeae, Chlamydophila pneumoniae, and Mycoplasma pneumoniae.
- Streptococcal pharyngitis
Streptococcal pharyngitis or strep throat is caused by group A beta-hemolytic streptococcus (GAS). It is the most common bacterial cause of cases of pharyngitis (15–30%). Common symptoms include fever, sore throat, and large lymph nodes. It is a contagious infection, spread by close contact with an infected individual. A definitive diagnosis is made based on the results of a throat culture. Antibiotics are useful to both prevent complications and speed recovery.
- Fusobacterium necrophorum
Diphtheria is a potentially life threatening upper respiratory infection caused by Corynebacterium diphtheriae which has been largely eradicated in developed nations since the introduction of childhood vaccination programs, but is still reported in the Third World and increasingly in some areas in Eastern Europe. Antibiotics are effective in the early stages, but recovery is generally slow.
A few other causes are rare, but possibly fatal, and include parapharyngeal space infections: peritonsillar abscess ("quinsy"), submandibular space infection (Ludwig's angina), and epiglottitis.
Pharyngitis may also be caused by mechanical, chemical or thermal irritation, for example cold air or acid reflux. Some medications may produce pharyngitis such as pramipexole and antipsychotics.
Diagnostic approach 
|Points||Probability of Strep||Management|
|1 or less||<10%||No antibiotic or culture needed|
|2||11–17%||Antibiotic based on culture or RADT|
|4 or 5||52%||Empiric antibiotics|
One point is given for each of the criteria:
- Absence of a cough
- Swollen and tender cervical lymph nodes
- Temperature >38.0 °C (100.4 °F)
- Tonsillar exudate or swelling
- Age less than 15 (a point is subtracted if age >44)
The McIsaac criteria adds to the Centor:
- Age less than 15: add one point
- Age greater than 45: subtract one point
The Infectious Disease Society of America however recommends against empirical treatment and considers antibiotics only appropriate following positive testing. Testing is not needed in children under three as both group A strep and rheumatic fever are rare, except if they have a sibling with the disease.
The majority of time treatment is symptomatic. Specific treatments are effective for bacterial, fungal, and herpes simplex infections.
- Analgesics such as NSAIDs and acetaminophen can help reduce the pain associated with a sore throat. (Note: Don't use salicylates, like aspirin, for influenza: Increased risk of Reye's syndrome)
- Steroids (such as dexamethasone) have been found to be useful for severe pharyngitis.
- Viscous lidocaine relieves pain by numbing the mucus membranes.
- Antibiotics are useful if a bacterial infection is the cause of the sore throat. For viral infections, antibiotics have no effect.
- Oral analgesic solutions, the active ingredient usually being Phenol, but also less commonly Benzocaine, Cetylpyridinium chloride and/or Menthol. Chloraseptic and Cēpacol are two examples of brands of these kinds of analgesics.
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