Is bipolar disorder hereditary?

Genetics: Bipolar disorder has been found to have some hereditary basis. This doesn't mean that there is a 100% chance that the offsoring of someone with bipolar d/o will enx up with it as well, but rather there is more likelihood as compared to the general population. I believe bipolar d/ o is now the 2nd highezt of mental d/o, being surpassed by adhd.

Yes: Bipolar disorder disorder definitely runs in families. There has not yet been found a specific genetic link, but much research is being done in that area. Even though there is likely a genetic link, the expression of symptoms may be variable.

Yes: There is a lot of evidence for a genetic predisposition to bipolar disorder. Twin studies show evidence for genetic predisposition. However, genes are nit the only factor - bipolar disorder, like most mental illnesses have complicated, multifactorial etiologies.