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Bipolar disorder is a serious mental illness. People who have it go through unusual mood changes. They go from very happy, "up," and active to very sad and hopeless, "down," and inactive, and then back again. They often have normal moods in between. The up feeling is called mania. The down feeling is depression.
The causes of bipolar disorder aren't always clear. It runs in families. Abnormal brain structure and function may also play a role.(Read more)