Why bipolar II is not just a milder version of bipolar I

When I graduated from medical school, I carried an assumption I suspect many of us do: Bipolar II disorder is a “milder” version of bipolar I. After all, mania is dramatic. It is disruptive. It can involve psychosis, hospitalization, legal consequences, and financial devastation. Hypomania, by comparison, seems restrained: more energy, less sleep, no involuntary admission. The hierarchy seemed obvious. Mania is more severe than hypomania. Therefore bipolar I must …

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Why bipolar II is not just a milder version of bipolar I