What are the causes of multiple personality disorder?

Childhood abuse: Dissociative identity disorder (did) is often associated with history of severe childhood trauma or abuse -- usually happening over an extended period. This could be physical, emotional, sexual, or some combination. The dissociative aspect is a coping mechanism -- the person unconsciously dissociates himself/herself from experiences or situations that are too painful to consciously assimilate.

Multiple personality: Typically, incredible amounts of physical and sexual abuse in early to mid childhood that goes unnoticed and therefore unchecked, as well as severe detachment disorders.