With regard to depressive disorders, the DSM-IV

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The DSM-IV defines major depression as the presence of a group of symptoms consistently evident for a period of time. This includes a feeling of sadness, emptiness or hopelessness, loss of interest or pleasure in usual activities, changes in appetite or weight, changes in sleep patterns, decreased energy and feelings of worthlessness or guilt. It also specifies that the symptoms cause significant distress or impairment in functioning. MAO inhibitors may be used as a treatment option, but this is not the recommended first line of therapy. The DSM-IV includes both affective and behavioral symptoms in the definition of depression. There is no mention of recognizing major depression with as few as one or two symptoms.

With Regard to Depressive Disorders, the DSM-IV