Dissociative identity disorder (DID), often called multiple personality disorder (MPD), has fascinated people for over a century. However, though it is a very well-known disorder, mental health professionals are not even sure if it exists. It is possible that it is a form of another illness, like schizophrenia. Another theory is that it doesn’t exist at all, and those who have it, including the following people, are simply acting.

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https://listverse.com/2015/03/16/10-famous-cases-of-dissociative-identity-disorder/