Major Depressive Disorder vs Bipolar II Disorder and Cyclothymic Disorder
Major Depressive Disorder and Bipolar II Disorder and Cyclothymic Disorder are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.
Major Depressive Disorder vs Bipolar II Disorder and Cyclothymic Disorder at a glance
- Major Depressive Disorder: Persistent depressed mood or anhedonia >=2 weeks with neurovegetative and cognitive symptoms causing functional impairment.
- Bipolar II Disorder and Cyclothymic Disorder: Mood disorders with hypomanic (not manic) episodes; bipolar II has full depressive episodes, cyclothymia has chronic subthreshold oscillation.
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Side-by-side comparison
| Feature | Major Depressive Disorder | Bipolar II Disorder and Cyclothymic Disorder |
|---|---|---|
| At a glance | Persistent depressed mood or anhedonia >=2 weeks with neurovegetative and cognitive symptoms causing functional impairment. | Mood disorders with hypomanic (not manic) episodes; bipolar II has full depressive episodes, cyclothymia has chronic subthreshold oscillation. |
| Classic presentation | SIG E CAPS mnemonic — Sleep, Interest, Guilt, Energy, Concentration, Appetite, Psychomotor, Suicidality. Five of nine including depressed mood or anhedonia x 2 weeks.; Depressed mood most of the day, nearly every day (self-reported or observed); Markedly diminished interest or pleasure in nearly all activities (anhedonia); Significant… | Patient presents with depression and reports past 'best week of my life' periods of needing only 3 hours of sleep, completing massive projects, and spending impulsively — without ever being hospitalized or psychotic.; Hypomania: elevated/expansive or irritable mood, decreased need for sleep, increased energy and goal-directed activity,… |
| Workup / key labs | DSM-5-TR: >=5 of 9 symptoms present for >=2 weeks, with at least one being depressed mood OR anhedonia. Symptoms must cause clinically significant distress/impairment, not be attributable to a substance or medical condition, and not be better explained by a psychotic or bipolar disorder. PHQ-9 >=10 supports diagnosis and tracks severity… | Bipolar II: ≥1 hypomanic episode (≥4 days, ≥3 of 7 symptoms, observable change, no marked impairment/psychosis/hospitalization) + ≥1 MDE; never met manic criteria. Cyclothymia: ≥2 yr (≥1 yr youth) of subthreshold hypomanic AND depressive symptoms, ≥half the time, no symptom-free interval >2 mo, no MDE/manic/hypomanic episode in first 2… |
| Imaging | Neuroimaging not routine; consider MRI brain if new focal neurologic findings, atypical features, or first episode after age 50 | Not routinely indicated; Neuroimaging if first episode late-life or focal neurologic findings |
| First-line treatment | Psychotherapy — cognitive behavioral therapy (CBT) or interpersonal therapy (IPT); comparable to medication for mild-moderate episodes; SSRI — sertraline, escitalopram, fluoxetine (first-line pharmacotherapy; start low, titrate after 2-4 weeks; full effect at 6-8 weeks); SNRI — venlafaxine, duloxetine, desvenlafaxine (consider with… | Bipolar II acute depression: quetiapine (best evidence), lurasidone, cariprazine, or lumateperone; Bipolar II maintenance: lithium (anti-suicide benefit), lamotrigine (especially if depression-predominant), or quetiapine; Cyclothymia: mood stabilizer (lithium, valproate, lamotrigine) ± psychotherapy; Psychotherapy: CBT, family-focused… |
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