Dissociative identity disorder (DID), formerly known as multiple personality disorder, is a condition that involves the presence of two or more distinct identities., Dissociative Identity Disorder (DID) (also previously known as multiple personality disorder), is a mental disorder characterized by at least two distinct and relatively enduring personality states., Dissociative identity disorder (DID) is a rare condition in which two or more distinct identities, or personality states, are present in—and alternately take control of—an individual., Learn more about Dissociative Identity Disorder (DID), including, diagnosis, symptoms, treatment, recovery, and follow-up care. Find a doctor for Dissociative Identity Disorder (DID)., Dissociative identity disorder (DID) is a psychiatric condition where a person has more than one identity, often referred to as "alters.", Most people with DID have experienced repetitive and severe childhood trauma, including physical and sexual abuse, emotional neglect, and a dysfunctional home environment..