Does multiple personality disorder exist?

Awesome question !!: You are going to get different answers from different responders. The name was changed to dissociative identity disorder (did). I do believe it exists. Why? Because I have seen two cases (over the last 3 + decades). After seeing many thousands of people, these two cases will be forever etched in my mind, even though i only treated both very briefly. My own personal belief is that it is a severe >.

MPD = DID now: You ask a much-debated question, but yes this condition exists -- only it's now called "dissociative identity disorder." I have treated several in my career -- one currently. All had histories of severe childhood trauma, with varying degrees of neglect. My current patient was abandoned multiple times. Her presentation now is an earnestly healing person dealing with severe, complex ptsd.

Multiple personality: MPD now called dissociative identity disorder is extremely controversial because of the distortions in the popular press. It is also extremely rare; clinicians in practice for decades will see the end of their careers without ever encountering one single case. That being said, it is still listed in the DSM5 as a recognized psychiatric disorder.

DID (Multiple Person: Also called multiple personality do, is characterized by at least 2 distinct identities that alternately control one's behavior, accompanied by memory impairment for important information, not due to influence of illicit substances or seizures or other medical condition.