The simple idea
Picture mood and energy travelling between two ends:
- Depressive pole: low energy, no motivation, no pleasure, hopelessness.
- Manic pole: high energy, over‑activity, overconfidence, little need for sleep, impulsivity.
Two main types:
- Bipolar I — has had at least one full manic episode (depression is common but not required).
- Bipolar II — has had hypomania + major depression, but never a full mania.
So the single dividing line is simple: mania → Bipolar I; hypomania (no mania) → Bipolar II.
| Bipolar I | Bipolar II | |
|---|---|---|
| Full mania | yes (≥1) | never |
| Hypomania | maybe | yes |
| Major depression | common | yes |
| Dividing line | mania | hypomania + depression |
Why this matters so much 🔑
Here's a trap that changes lives: someone comes in saying "I've been depressed many times." The easy move is to treat it as ordinary depression. But if they've ever had a high‑energy, little‑sleep, impulsive, "not‑like‑me" period, the real diagnosis may be bipolar — and the treatment is different. Treating bipolar depression as if it were plain depression can even trigger a high.
So the golden question in recurrent depression is: "Have you ever had a stretch of days with unusually high energy and very little need for sleep?"
Quick check ✅
- What's the one feature that separates Bipolar I from Bipolar II?
- Why must you ask about "highs" before treating repeated depression?
Remember this 🌟
Where we're going next → From mood to the body's alarm system — anxiety (Concept 20).