Bipolar Disorder & Heredity – The Genetic Link: Part II
In Part I of this two-part series, we examined the role that genetics likely plays in the onset of bipolar disorder and learned that genetics contributes up to 80%, with environmental factors contributing about 20% or more. (This means that if someone has bipolar disorder, the cause of it is 75-80% due to genetics. It does not mean an individual in a family with a history of bipolar has a 75-80% chance of developing it. See Part I for statistics on the inheritability of bipolar.)
It appears that for most people there needs to be some environmental factors that "turn on" the genes responsible for one's vulnerability to bipolar disorder. Many of these environmental triggers may occur early in life and may include things such as:






