How is bipolar disorder diagnosed?

Bipolar disorder is diagnosed by a qualified mental health professional, such as a psychiatrist, using structured interviews, medical history, and observation of symptoms. There is no single blood test or scan—diagnosis relies on patterns of mood changes over time.

Clinicians use the DSM-5 criteria to identify whether symptoms fit bipolar I, bipolar II, or cyclothymia. They may also rule out other causes such as thyroid problems, substance use, or depression without mania. A clear diagnosis is crucial to ensure the right treatment plan.

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