is bipolar disease inherited? if so how common is it and to what extent?

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Sometimes it is inherited.

There is some research that suggests it is genetic

"Bipolar disorder is considered to be a result of complex interactions between genes and environment. The monozygotic concordance rate for the disorder is 70%. This means that if a person has the disorder, an identical twin has a 70% likelihood of having the disorder as well. Dizygotic twins have a 23% concordance rate. These concordance rates are not universally replicated in the literature, recent studies have shown rates of around 40% for monozygotic and <10% for dizygotic twins (see Kieseppa, 2004 [1] and Cardno, 1999 [2])."

Yes it is. My mother-in-law is bipolar. She has 6 children, 4 inherited it. Her father was bipolar as well. The extent is individual, and I believe if left untreated, can become very severe.

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is bipolar disease inherited? if so how common is it and to what extent?

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