Updated: Feb 4, 2008
Somatoform disorders represent a group of disorders characterized by physical symptoms suggesting a medical disorder. However, somatoform disorders represent a psychiatric condition because the physical symptoms present in the disorder cannot be fully explained by a medical disorder, substance use, or another mental disorder. These somatoform disorder physical complaints challenge medical providers who must distinguish between a physical and psychiatric source for the patient's complaints. Often, the medical symptoms patients experience may be from both medical and a psychiatric illnesses. Anxiety disorders and mood disorders commonly produce physical symptoms. These physical symptoms can dramatically improve with successful treatment of the anxiety or mood disorder.
The Diagnostic and Statistical Manual for Mental Disorders, Fourth Edition, Text Revision (DSM-IV-TR) includes a specific category for somatic symptoms related to psychiatric origins called the somatoform disorders. Specific somatoform disorders include (1) somatization disorder, (2) conversion disorder, (3) pain disorder, (4) hypochondriasis, and (5) body dysmorphic disorder. Somatization disorder is a relatively rare disorder that is associated with high medical resource utilization. More common somatization syndromes may not reach the diagnostic threshold for somatization disorder but may be clinically and functionally significant.
The pathophysiology of somatization and somatization disorder is unknown. Primary somatoform disorders may be associated with a heightened awareness of normal bodily sensations. This heightened awareness may be paired with a cognitive bias to interpret any physical symptom as indicative of medical illness. Autonomic arousal may be high in some patients with somatization. This autonomic arousal may be associated with physiologic effects of endogenous noradrenergic compounds such as tachycardia or gastric hypermotility. Heightened arousal also may induce muscle tension and pain associated with muscular hyperactivity, as is seen with muscle tension headaches.
A study in Belgium reported that somatization syndrome is the third highest psychiatric disorder, with a prevalence rate of 8.9%. The first and second most common psychiatric disorders were depression and anxiety disorders.1
Somatoform disorders do not appear to independently increase the risk of death. Some evidence exists that somatization disorder is associated with increased risk for suicide attempts. Patients with somatoform disorders may be misdiagnosed as having a medical condition and therefore experience iatrogenic complications due to invasive diagnostic procedures or surgical operations.
In most somatoform disorder categories, a female preponderance exists. The female-to-male ratio has been estimated to be 10:1 for somatization disorder, from 2:1 to 5:1 for conversion disorder, 2:1 for pain disorder, and 1:1 for hypochondriasis.
Somatization may begin in childhood, adolescence, or early adulthood. New onset of unexplained somatic disorders in older adults should prompt a search for occult medical illness or evidence of major depression associated with somatization.
History and symptoms vary depending on the specific anxiety disorder diagnosis.
By definition, somatoform disorders are not accompanied by physical findings or a medical illness that explains the symptoms. Physical examination may demonstrate multiple operations in unsuccessful attempts to diagnose or relieve symptoms.
| Acute Respiratory Distress Syndrome | Gastritis, Acute |
| Addison Disease | Goiter |
| Adjustment Disorders | Goiter, Diffuse Toxic |
| Adrenal Crisis | HIV Disease |
| Alcoholism | Hyperaldosteronism, Primary |
| Amphetamine-Related Psychiatric
Disorders | Hypercalcemia |
| Anaphylaxis | Hyperparathyroidism |
| Androgen Excess | Hyperprolactinemia |
| Anorexia Nervosa | Hypersensitivity Reactions, Delayed |
| Asthma | Hypersensitivity Reactions, Immediate |
| Atrial Fibrillation | Inhalant-Related Psychiatric Disorders |
| Atrial Tachycardia | Injecting Drug Use |
| Attention Deficit Hyperactivity Disorder | Insomnia |
| Autistic Spectrum Disorders | Irritable Bowel Syndrome |
| Body Dysmorphic Disorder | Lyme Disease |
| Brief Psychotic Disorder | Malingering |
| Bulimia | Meningitis |
| Caffeine-Related Psychiatric Disorders | Multifocal Atrial Tachycardia |
| Cannabis Compound Abuse | Obsessive-Compulsive Disorder |
| Cardiogenic Shock | Obstructive Sleep Apnea-Hypopnea
Syndrome |
| Delirium | Panic Disorder |
| Delirium Tremens | Personality Disorders |
| Delusional Disorder | Phobic Disorders |
| Depression | Premenstrual Dysphoric Disorder |
| Diabetic Ketoacidosis | Primary Hypersomnia |
| Digitalis Toxicity | Primary Insomnia |
| Dissociative Disorders | Schizophrenia |
| Dysthymic Disorder | Schizophreniform Disorder |
| Esophageal Motility Disorders | Shared Psychotic Disorder |
| Esophageal Spasm | Sleep Disorders |
| Euthyroid Hyperthyroxinemia | Stimulants |
| Factitious Disorder | Thyroiditis, Subacute |
| Fibromyalgia | Tourette Syndrome |
| Folic Acid Deficiency | Unstable Angina |
| Food Poisoning |
Somatoform disorders must be differentiated from medical illnesses as well as from other psychiatric conditions; consider medical conditions that cause vague and diffuse symptoms. Also, consider somatization as part of a mood or anxiety disorder.
Cerebrovascular accidentSomatization disorder: For people with somatization disorder, medication approaches rarely are successful. Physicians should search for evidence of psychiatric comorbidity, such as depression or an anxiety disorder. If present, medication interventions specific to the diagnosis can be attempted. Successful treatment of a major depression or an anxiety disorder, such as panic disorder, also may produce significant reduction in somatization disorder. Nonmedication strategies are the most successful. See psychosocial treatment in Medical Care for more details.
Hypochondriasis: Hypochondriasis may be a feature of a mood or anxiety disorder. Pharmacologic treatment of the mood or anxiety disorder may reduce hypochondriacal symptoms. If a mood or anxiety disorder is present, see Medical Care. Group psychotherapy is very effective in a medical setting.
Conversion disorder: No specific pharmacological interventions have been shown to be effective for conversion disorder.
Pain disorder: Analgesic therapy often is ineffective for somatoform disorders characterized a pain disorder. Tricyclic antidepressants and selective serotonin reuptake inhibitors (SSRI) may be helpful.
Body dysmorphic disorder: Randomized controlled trials demonstrate that selective serotonin reuptake inhibitors reduce symptoms in as many as one half of individuals with body dysmorphic disorders. Case reports have suggested improvement with other agents, including monoamine oxidase inhibitors, tricyclic antidepressants, and the pimozide (an antipsychotic).
Imipramine is a tricyclic antidepressant that has demonstrated clear superiority over the placebo in double-blind trials for treating specific symptoms of bulimia nervosa. However, SSRIs (eg, fluoxetine) probably should be first-line agents.
SSRIs are greatly preferred over the other classes of antidepressants. Because the adverse effect profile of SSRIs is less prominent, improved compliance is promoted. SSRIs do not have the cardiac arrhythmia risk associated with tricyclic antidepressants. Arrhythmia risk is especially pertinent in overdose, and suicide risk must always be considered when treating a child or adolescent with mood disorder.
Physicians are advised to be aware of the following information and use appropriate caution when considering treatment with SSRIs in the pediatric population.
In December 2003, the UK Medicines and Healthcare Products Regulatory Agency (MHRA) issued an advisory that most SSRIs are not suitable for use by persons younger than 18 years for treatment of "depressive illness." After review, this agency decided that the risks to pediatric patients outweigh the benefits of treatment with SSRIs, except fluoxetine (Prozac), which appears to have a positive risk-benefit ratio in the treatment of depressive illness in patients younger than 18 years.
In October 2003, the US Food and Drug Administration (FDA) issued a public health advisory regarding reports of suicidality in pediatric patients being treated with antidepressant medications for major depressive disorder. This advisory reported suicidality (both ideation and attempts) in clinical trials of various antidepressant drugs in pediatric patients. The FDA has asked that additional studies be performed because suicidality occurred in both treated and untreated patients with major depression and thus could not be definitively linked to drug treatment.
Inhibits reuptake of norepinephrine or serotonin (5-hydroxytryptamine, 5-HT), at presynaptic neuron. One of the oldest agents available for the treatment of depression and has established efficacy in the treatment of panic disorder. Geriatric and adolescent patients may need lower dosing or slower titration.
50-75 mg PO qd initial; titrate gradually to 150 mg qd according to tolerance; range, 75-300 mg/d hs or in divided doses
Not established
Increases toxicity of sympathomimetic agents (eg, isoproterenol, epinephrine) by potentiating effects and inhibiting antihypertensive effects of clonidine
Documented hypersensitivity; narrow-angle glaucoma; acute recovery phase following myocardial infarction; history of bipolar disorders; avoid in patients taking MAOIs or fluoxetine or in patients who took them in the previous 2 wk
C - Fetal risk revealed in studies in animals but not established or not studied in humans; may use if benefits outweigh risk to fetus
May impair mental or physical abilities required for performance of potentially hazardous tasks; caution in cardiovascular disease, conduction disturbances, seizure disorders, urinary retention, hyperthyroidism, or patients receiving thyroid replacement; an ECG prior to initiation of therapy with imipramine may be warranted, also repeating once on a stable dose, to monitor any potential widening of QRS
Selectively inhibits presynaptic serotonin reuptake with minimal or no effect in the reuptake of norepinephrine or dopamine.
10-20 mg/d PO initial; 20-60 mg PO maintenance
10-20 mg/d PO
Increases toxicity of diazepam and trazodone by decreasing clearance; also increases toxicity of MAOIs and highly protein-bound drugs
Documented hypersensitivity; patients concurrently taking MAOIs or patients who took them in the last 2 wk
B - Fetal risk not confirmed in studies in humans but has been shown in some studies in animals
Some patients may experience increased anxiety and agitation, especially with first dose; caution in preexisting seizure disorders, recent myocardial infarction, unstable heart disease, and hepatic or renal impairment
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somatization, body dysmorphic disorder, conversion disorder, hypochondriasis, somatization disorder, somatoform disorder NOS, somatoform disorder not otherwise specified, unexplained physical symptoms
William R Yates, MD, Professor of Research, Department of Psychiatry, University of Oklahoma College of Medicine at Tulsa
William R Yates, MD is a member of the following medical societies: Academy of Psychosomatic Medicine, American Academy of Family Physicians, and American Psychiatric Association
Disclosure: Forest Laboratories Grant/research funds Other
Mohammed A Memon, MD, Medical Director of Geriatric Psychiatry, Department of Psychiatry, Spartanburg Regional Hospital System
Mohammed A Memon, MD is a member of the following medical societies: American Association for Geriatric Psychiatry, American Medical Association, and American Psychiatric Association
Disclosure: Nothing to disclose.
Francisco Talavera, PharmD, PhD, Senior Pharmacy Editor, eMedicine
Disclosure: Nothing to disclose.
Eduardo Dunayevich, MD, Adjunct Assistant Professor, Department of Psychiatry, University of Cincinnati; Clinical Research Physician, Neuroscience, Lilly Research Laboratories
Eduardo Dunayevich, MD is a member of the following medical societies: American Psychiatric Association
Disclosure: Nothing to disclose.
Harold H Harsch, MD, Program Director of Geropsychiatry, Department of Geriatrics/Gerontology, Associate Professor, Department of Psychiatry and Department of Medicine, Froedtert Hospital, Medical College of Wisconsin
Harold H Harsch, MD is a member of the following medical societies: American Psychiatric Association
Disclosure: lilly Honoraria Speaking and teaching; BMS Honoraria Speaking and teaching; Forest Labs Honoraria Speaking and teaching; AstraZeneca Honoraria Speaking and teaching; Pfizer Grant/research funds Other; Northstar Grant/research funds Other; Novartis Other
Stephen Soreff, MD, President of Education Initiatives, Nottingham, NH; Faculty, Metropolitan College of Boston University, Boston, MA
Stephen Soreff, MD is a member of the following medical societies: American College of Mental Health Administration and American Psychosomatic Society
Disclosure: Nothing to disclose.
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