A valid classification is important for further understanding of the somatoform disorders. The main disorders in this grouping – somatization disorder and hypochondriasis – have lengthy historical traditions and are defined in a contrasting manner. Various authors point to distinguishing demographic and clinical features, but there have been few direct comparisons of patients with these disorders. A review of the literature indicates those domains where differences are most likely to be found. Research assessing these may serve to refine and validate these key somatoform categories and/or dimensions.

Keywords:
Hypochondriasis, Somatization disorder, Somatoform disorders, Classification, Diagnosis
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