## Cyclothymia: Duration and Diagnostic Criteria **Key Point:** Cyclothymia in adults requires a minimum duration of **2 years** of alternating hypomanic and depressive symptoms, according to DSM-5. ### Cyclothymia vs. Bipolar Disorder: Duration Comparison | Feature | Cyclothymia | Bipolar II | |---------|-------------|----------| | Minimum Duration (Adults) | 2 years | 2 weeks (for episodes) | | Hypomanic Episodes | Hypomanic symptoms (not full episodes) | Full manic or hypomanic episodes | | Depressive Episodes | Depressive symptoms (not full episodes) | Full major depressive episodes | | Severity | Milder, subsyndromal | Full-threshold episodes | | Symptom-Free Periods | Rare or absent | May occur between episodes | ### Core Diagnostic Criteria for Cyclothymia 1. **Alternating mood states** — hypomanic symptoms alternating with depressive symptoms 2. **Subsyndromal severity** — does not meet full criteria for manic, hypomanic, or major depressive episodes 3. **Chronic course** — 2 years minimum in adults (1 year in children/adolescents) 4. **Frequent mood shifts** — symptoms present most days, with mood-free intervals lasting no more than 2 months 5. **Functional impairment** — causes clinically significant distress or impairment **High-Yield:** Cyclothymia is a **precursor to bipolar disorder** — approximately 15–50% of patients with cyclothymia eventually develop bipolar I or II disorder. This progression is a high-yield concept for NEET PG. **Mnemonic:** **CYCLE** — **C**hronic (2 years), **Y**early or more frequent mood shifts, **C**yclical pattern, **L**ess severe (subsyndromal), **E**arly onset (often adolescence/early adulthood). **Clinical Pearl:** Patients with cyclothymia often report that mood changes are triggered by minor life stressors or sleep disruption, and they may not seek treatment until mood instability becomes more severe.
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