Bipolar Disorder and depression
Bipolar Disorder (BD) is characterized by episodes that alternate between depression and mania or hypomania (states of elevated mood, increased energy, reduced need for sleep, grandiosity). There are two main types: BD I (with full manic episodes) and BD II (with hypomania — a milder form of mania — and depressive episodes).
A critical clinical distinction: in bipolar depression, using antidepressants without a mood stabilizer can trigger mania or rapid cycling — making an accurate diagnosis essential before starting treatment. Mood stabilizers (lithium, valproate, lamotrigine) and some atypical antipsychotics are the mainstay of BD treatment.
A BD diagnosis is often delayed — on average 8 years after symptoms begin. Many people are first diagnosed with major depression and only discover they have BD after developing mania while on an antidepressant. Carefully screening for past hypomanic episodes is an essential part of any depression evaluation.
Practical example
When the psychiatrist asked Mateus whether he'd ever had periods of "a lot of energy, little sleep but not feeling tired, racing ideas, and a sense that he could do anything," he recalled times like that back in college. This changed his diagnosis from depression to bipolar II — and his treatment: lithium instead of an antidepressant alone.
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