Multiple personalities are clinically real and medically known as Dissociative Identity Disorder (DIDD), which is a psychosomatic disorder characterized primarily by identity disintegration. Dissociative Identity Disorder is characterized by identity disintegration, which is manifested by the fact that at least two different personalities or identities can exist in a single individual, with only one personality or identity being the most intact and prominent at any one time. Patients with dissociative identity disorder often need to be stimulated by people, objects, or events in their surroundings before switching personalities or identities, and may be accompanied by anxiety or depressive symptoms, hallucinations, and other symptoms. This disorder is treated clinically with psychotherapy, which aims to stabilize each personality and integrate the various personalities. In addition, patients with anxiety or depressive symptoms may be treated with anti-anxiety drugs (buspirone) and anti-depressants (sertraline, etc.). If you or someone around you has dissociative identity disorder, you should seek medical attention.