Dissociative identity disorder (formerly termed multiple personality disorder) is a complicated psychiatric illness caused by a variety of circumstances, including severe childhood trauma (usually extreme, repetitive physical, sexual, or emotional abuse).
Moreover, dissociative identity disorder (DID) is a severe dissociation, a mental process in which a person’s ideas, experiences, emotions, behaviors, or sense of identity are disconnected. This condition is assumed to be caused by various factors, including the trauma that the individual with the illness has undergone