Obsessive-compulsive spectrum disorders

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Abstract
Obsessive-compulsive disorder is an anxiety disorder within the Diagnostic and Statistical Manual of Mental Disorders and International Classification of Diseases classification systems. A growing trend in the literature has been to link obsessive-compulsive disorder with a broad range of other disorders loosely described as the obsessive-compulsive disorder spectrum of disorders on the basis that these disorders share clinical features, comorbidity, aetiological factors and treatment response. Examination of the evidence would indicate that there are significant differences between these conditions and that many of the spectrum disorders share a vulnerability to anxiety and depressive disorders rather than to obsessive-compulsive disorder per se.