Which form of bipolar disorder is the most severe, with manic states lasting a week or longer?

• A. Bipolar I disorder
• B. Bipolar II disorder
• C. Cyclothymic disorder
• D. Major depressive disorder

Answer: (A)

Manic episodes lasting at least a week define the most severe form of bipolar disorder. This level of mania is central to Bipolar I disorder, which can include episodes of intense elevated mood, grandiosity, risky behavior, and significant impairment or hospitalization, sometimes with psychotic features. In contrast, Bipolar II involves hypomanic episodes that are less severe and do not cause marked impairment, plus major depressive episodes. Cyclothymic disorder features long-standing, milder mood fluctuations that don’t meet full criteria for mania or major depressive episodes. Major depressive disorder involves depressive episodes without any history of manic or hypomanic episodes.