How long must hypomanic episodes last to differentiate them from manic episodes?

Hypomanic episodes are characterized by a distinct period of abnormally elevated, expansive, or irritable mood, lasting for at least four consecutive days. This duration is critical in differentiating hypomanic episodes from manic episodes. In the DSM-5, a manic episode must last for at least one week—or any duration if hospitalization is necessary—whereas hypomania is specifically noted to require a shorter duration of four days.

This distinction is important because it helps clinicians accurately diagnose and treat bipolar disorders and ensures that the timing of symptoms is considered when evaluating the severity and impact on the individual's functioning. Understanding the duration of these episodes is vital for proper diagnosis and subsequent intervention planning.