|Classification and external resources|
In psychiatry and psychology, a somatoform disorder is a mental disorder characterized by symptoms that suggest physical illness or injury – symptoms that cannot be explained fully by a general medical condition or by the direct effect of a substance, and are not attributable to another mental disorder (e.g., panic disorder). The symptoms of a somatoform disorder are considered to be due to a hard wiring problem within the brain where thoughts are sent down into the body through the Autonomic Nervous System to become symptoms instead of being sent up into the conscious area of the brain. In people who have a somatoform disorder, medical test results are either normal or do not explain the person's symptoms, and history and physical examination do not indicate the presence of a medical condition that could cause them. Patients with this disorder often become worried about their health because doctors are unable to find a cause for their symptoms. This may cause severe distress. Preoccupation with the symptoms may portray a patient's exaggerated belief in the severity of their ill-health. Symptoms are sometimes similar to those of other illnesses and may last for several years. Usually, the symptoms begin appearing during adolescence, and patients are diagnosed before the age of 30 years. Symptoms may occur across cultures and gender. Other common symptoms include anxiety and depression. In order for an individual to be diagnosed with somatoform disorder, they must have recurring somatic complaints for several continuous years.
Somatoform disorders are not the result of conscious malingering (fabricating or exaggerating symptoms for secondary motives) or factitious disorders (deliberately producing, feigning, or exaggerating symptoms) – sufferers perceive their plight as real. Additionally, a somatoform disorder should not be confused with the more specific diagnosis of a somatization disorder. Various laboratory tests, physical examinations, and surgeries on these individuals show no evidence supporting the idea that these exaggerating symptoms are present. Mental disorders are treated separately from physiological or neurological disorders. Somatoform disorder is difficult to diagnose and treat since doing so requires psychiatrists to work with neurologists on patients with this disorder. Those that do not pass the diagnostic criteria for a somatoform disorder but still present physical symptoms are usually referred to as having "somatic preoccupation".
Recognized somatoform disorders 
The somatoform disorders are actually a group of disorders, all of which fit the definition of physical symptoms that mimic physical disease or injury for which there is no identifiable physical cause; as such, they are a diagnosis of exclusion. They are recognized by the Diagnostic and Statistical Manual of Mental Disorders of the American Psychiatric Association as the following:
- Conversion disorder: A somatoform disorder involving the actual loss of bodily function such as blindness, paralysis, and numbness due to excessive anxiety
- Somatization disorder: A disorder characterized by multiple physical complaints which do not have a medical explanation.
- Hypochondriasis: A somatoform disorder involving persistent and excessive worry about developing a serious illness.
- Body dysmorphic disorder
- Pain disorder
- Undifferentiated somatoform disorder – only one unexplained symptom is required for at least 6 months.
Included among these disorders are false pregnancy, psychogenic urinary retention, and mass psychogenic illness (so-called mass hysteria).
- Somatoform disorder Not Otherwise Specified (NOS)
Proposed somatoform disorders 
Additional proposed somatoform disorders are:
- Abridged somatization disorder – at least 4 unexplained somatic complaints in men and 6 in women
- Multisomatoform disorder – at least 3 unexplained somatic complaints from the PRIME-MD scale for at least 2 years of active symptoms
These disorders have been proposed because the recognized somatoform disorders are either too restrictive or too broad. In a study of 119 primary care patients, the following prevalences were found:
- Somatization disorder – 1%
- Abridged somatization disorder – 6%
- Multisomatoform disorder – 24%
- Undifferentiated somatoform disorder – 69%
DSM-IV-TR Diagnostic Criteria for Somatization Disorder 
The Diagnostic and Statistical Manual of Mental Disorders fourth edition, DSM IV-TR, defines somatization disorder as:
A. A history of many physical complaints beginning before age 30 years, occurring over several years, resulting in seeking treatment, or signiﬁcant impairment.
B. Each one of the following criteria must have been met, with individual symptoms occurring at any time:
1. Four pain symptoms (related to different sites or functions)
2. Two gastrointestinal symptoms (other than pain)
3. One sexual symptom (other than pain)
4. One "pseudoneurological" symptom (not limited to pain)
C. Either (1) or (2):
1. after appropriate investigation, each of the symptoms cannot be fully explained by a known general medical condition (GMC) or direct effects of a substance.
2. when there is a related GMC, the physical complaints or resulting impairment are in excess of what would be expected from the history, physical examination, or laboratory ﬁndings.
D. The symptoms are not intentionally produced or feigned(as in factitious disorder or malingering).
See also 
- American Psychiatric Association. Task Force on DSM-IV. (2000). Diagnostic and statistical manual of mental disorders: DSM-IV-TR. American Psychiatric Pub. ISBN 978-0-89042-025-6. pp 485
- Oyama, Oliver. "Somatoform Disorders – November 1, 2007 – American Family Physician." Website – American Academy of Family Physicians. Web. 30 Nov. 2011. <http://www.aafp.org/afp/2007/1101/p1333.html>.
- La France, Jr. W. Kurt (2009). "Somatoform disorders". Seminars in Neurology 29 (3): 234–46. doi:10.1055/s-0029-1223875. PMID 19551600.
- LaFrance, W. Curt (2009). "Jr., MD., MPH". Somatoform Disorders. 29: 234–246.
- Curt, LaFrance; Jr, W Curt (01). "Somatoform disorders". Seminars in neurology 29 (3): 234. doi:10.1055/s-0029-1223875. PMID 19551600. Retrieved 29 November 2012.
- LaFrance, C.W. "Somatoform Disorders". SEMINARS IN NEUROLOGY, V. 29 (3), 06/2009, pp. 234–246.
- Oyama O., Paltoo C., Greengold J. (2007). "Somatoform disorders". American Family Physician 76 (9): 1333–8.
- Schacter, D. L., Gilbert, D. T., & Wegner, D.M. (2011). Psychology: Second Edition. New York, NY: Worth
- Hales, Robert E; Yudofsky, Stuart C (2004). Essentials of Clinical Psychiatry. ISBN 9781585620333.
- Escobar JI, Rubio-Stipec M, Canino G, Karno M (1989). "Somatic symptom index (SSI): a new and abridged somatization construct. Prevalence and epidemiological correlates in two large community samples". J. Nerv. Ment. Dis. 177 (3): 140–6. doi:10.1097/00005053-198903000-00003. PMID 2918297.
- Lynch DJ, McGrady A, Nagel R, Zsembik C (1999). "Somatization in Family Practice: Comparing 5 Methods of Classification". Primary care companion to the Journal of clinical psychiatry 1 (3): 85–89. doi:10.4088/PCC.v01n0305. PMC 181067. PMID 15014690.
- Diagnostic and Statistical Manual of Mental Disorders Fourth edition Text Revision (DSM-IV-TR) American Psychiatric Association (2000)