路 dissociative identity disorder (did) is a rare condition in which two or more distinct identities, or personality states, are present in鈥攁nd alternately take control of鈥攁n individual. Dissociative identity disorder (did) is a mental health condition where you have two or more separate personalities that control your behavior at different times. Dissociative identity disorder (did), previously known as multiple personality disorder (mpd), is characterized by the presence of at least two personality states or alters. Learn about the symptoms of did here. 路 dissociative identity disorder is an often misunderstood condition, but the tide is turning. 路 dissociative identity disorder (did), previously known as multiple personality disorder, is a complex psychological condition caused by many things. These include severe trauma during early.