Bipolar disorder is often misdiagnosed as depression for over a decade.

Bipolar disorder causes shifts between depressive lows and manic highs, while unipolar depression involves only lows. Telling them apart is difficult. Because of this, patients often wait over ten years for a correct diagnosis. Researchers wanted to know which warning signs during depressive episodes help family doctors spot bipolar disorder earlier. They collected and analyzed thirty-six studies that examined patient histories and symptoms. They found that no single clue is strong enough on its own. Instead, doctors must look for a mix of patterns. The clearest signs include getting depressed at an early age, having many repeat episodes, and having a family history of bipolar disorder. Other key red flags are cyclothymic temperament (frequent mood swings), past suicide attempts, postpartum depression, psychotic features like hallucinations, and mixed episodes where depression and mania overlap. Spotting these combined clues can trigger quicker, better care.

Why it matters

Millions of people with bipolar disorder are mistakenly treated for depression for years, receiving antidepressants that can actually worsen their condition. This review identifies specific warning signs—like early age of onset, family history, and postpartum depression—that general practitioners can use to catch bipolar disorder earlier. Earlier diagnosis means the right medication and better lives.

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