The primary difference between a manic episode and a hypomanic episode is that:

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A hypomanic episode is less severe than a manic episode. Both involve elevated, expansive, or irritable mood, increased energy or activity, and decreased need for sleep. However, a manic episode lasts at least one week, can include psychotic features or catatonic symptoms, and may require hospitalization. In contrast, a hypomanic episode lasts at least four days but no more than a week, does not include psychotic features or require hospitalization, and may not impair functioning.

The Primary Difference Between a Manic Episode and a Hypomanic