I think mine was, to some degree, triggered. My grandmother has schizophrenia. My mother has lived with anxiety and depression for as long as I can remember. She was hospitalized for drug abuse and depression when I was younger. My father was hospitalized for anger issues and likely has some form of MI. My brother has BP 1. Still, my mood swings have been triggered by events and immense stress. I honestly think that if certain stressful events had not occurred, my MI probably wouldn't have come to fruition.