While I have mood swings from PMDD (I'm one of the super lucky ones who have wench-fest before my period AND before ovulation!), I do not suffer from bi-polar symptoms. However, I do know individuals whom I have no doubt have bi-polar due to undiagnosed hypothyroidism. Read on . . .
http://www.stopthethyroidmadness.com/2011/08/16/hilarious-video/
http://www.psycheducation.org/thyroid/introduction.htm