Biology of bipolar disorder
Bipolar disorder is a mood disorder characterized by alternating periods of manic (elevated) and depressed mood. While the exact cause and mechanism of bipolar disorder remain unknown, ongoing research focuses on uncovering its biological origins. Although no single gene has been identified as the cause, numerous genes are associated with an increased risk of developing the disorder. Gene-environment interactions are also believed to play a role in predisposing individuals to bipolar disorder.
Source: Wikipedia
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