What causes bipolar disorder?

Several factors may contribute to bipolar disorder, including:

• Genes, because the illness runs in families. Children with a parent or sibling with bipolar disorder are more likely to get the illness than other children.
• Abnormal brain structure and brain function.
• Anxiety disorders. Children with anxiety disorders are more likely to develop bipolar disorder.

The causes of bipolar disorder aren't always clear. Scientists are studying it to find out more about possible causes and risk factors. This research may help doctors predict whether a person will get bipolar disorder. One day, it may also help doctors prevent the illness in some people.

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