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Low cortisol levels may increase risk of depression in bipolar disorder

Depression is almost twice as common, and poor quality of life almost five times as common, in people with bipolar disorder who have elevated or low levels of the stress hormone cortisol in the blood. Bipolar disorder is a lifelong disease that causes recurrent episodes of both mania and depression. Stress is a known trigger for these episodes, and depression and mania also adds to the accumulated stress load.
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