A disorder with marked swings of mood from cheerfulness to depression. These fluctuations are not as severe as those of Bipolar affective disorder.

A chronic but less severe form of a bipolar disorder that includes episodes of hypomania and several episodes of depression during a period of two years.

A syndrome of cyclic mood changes alternating between episodes of hypomania and moderate depression. Symptoms are not severe enough to warrant a diagnosis bipolar disorder.

a mild bipolar disorder that persists over a long time

In DSM-IV, one of the bipolar disorders characterized by numerous hypomanic episodes and frequent periods of depressed mood or loss of interest or pleasure. These episodes do not meet the criteria for a full manic episode or major depressive disorder