In Bipolar Disorder II, what is the minimum duration required for a hypomanic episode?

Explanation

## Duration Criteria for Hypomanic Episodes in Bipolar II **Key Point:** A hypomanic episode in Bipolar Disorder II must last for **at least 4 consecutive days** (not 2, not 7). This is a critical diagnostic criterion in DSM-5. ### Duration Hierarchy in Mood Episodes | Episode Type | Minimum Duration | Disorder Association | |--------------|------------------|---------------------| | **Hypomanic** | ≥4 consecutive days | Bipolar II (+ depression) | | **Manic** | ≥7 consecutive days | Bipolar I | | **Major depressive** | ≥2 weeks | MDD or Bipolar I/II | | **Mood elevation <4 days** | <4 days | Not a hypomanic episode; may be normal mood variation | **High-Yield:** The 4-day threshold for hypomania is frequently tested. Students often confuse it with the 7-day threshold for mania or the 2-week threshold for depression. **Warning:** A period of elevated mood lasting only 2–3 days, even if it meets all other criteria for hypomania (inflated self-esteem, decreased need for sleep, increased goal-directed activity, etc.), does NOT qualify as a hypomanic episode and does not support a diagnosis of Bipolar II. **Clinical Pearl:** Patients may report brief periods of elevated mood or energy; careful history-taking must confirm the 4-day minimum to avoid false-positive diagnosis of Bipolar II. **Mnemonic:** **4 days for Hypo**, **7 days for Manic** — remember the number 4 with "four letters in HYPO." [cite:DSM-5 Diagnostic Criteria for Bipolar II Disorder]