Key Diagnostic Criteria Distinguishing Manic Episode from Hypomanic Episode

Bipolar disorder, a medical illness with substantial morbidity and mortality, is characterized by episodic recurrent mania or hypomania and major depression. The hallmark of bipolar disorder is at least one episode of mania (bipolar I disorder) or hypomania (bipolar II disorder).
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DSM-IV Diagnostic Criteria for Major Depressive Episode

A. Five (or more) of the following symptoms have been present during the same 2-week period and represent a change from previous functioning; at least one of the symptoms is either (1) depressed mood or (2) loss of interest or pleasure.
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