Having two distinct personalities is commonly referred to as dissociative identity disorder (DID), formerly known as multiple personality disorder.

DSM 5 Multiple Personality Disorder
Explore the DSM-5 Criteria for Multiple Personality Disorder, now known as Dissociative Identity Disorder (DID), and gain insights into diagnosis and treatment.
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DSM 5 Multiple Personality Disorder Template
Commonly asked questions
Multiple personality disorder is not recognized in the DSM-5. It has been renamed and updated as dissociative identity disorder (DID) with revised criteria.
Symptoms of DID (formerly known as multiple personality disorder) include the presence of two or more distinct personality states, memory gaps, and significant distress or impairment in functioning.
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