## Diagnostic Distinction Between Bipolar I and II **Key Point:** Bipolar Disorder I is defined by the occurrence of at least one full manic episode, whereas Bipolar Disorder II is characterized by at least one hypomanic episode and at least one major depressive episode, but NO manic episodes. ### Manic vs. Hypomanic Episode | Feature | Manic Episode | Hypomanic Episode | |---------|---------------|-------------------| | **Duration** | ≥7 consecutive days | ≥4 consecutive days | | **Severity** | Severe; marked impairment or hospitalization required | Mild to moderate; no marked impairment | | **Psychotic features** | May be present | Absent | | **Functional impact** | Severe disruption in work/social/personal life | Noticeable but not severely disruptive | **High-Yield:** The presence of even one manic episode (not hypomanic) automatically classifies the disorder as Bipolar I, regardless of depressive history. **Mnemonic:** **MANIC = More severe, Needs hospitalization, At least 7 days** vs. **HYPOMANIC = Hypo (less) severe, 4 days minimum** ### Clinical Pearl Patients with Bipolar II often present with depression as the chief complaint, and the hypomanic episodes may be underreported or minimized by the patient—making careful history-taking essential for accurate diagnosis. [cite:DSM-5 Diagnostic Criteria for Bipolar Disorder]
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