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Formerly referred to as Multiple Personality Disorder, Dissociative Identity Disorder (DID) is a very unusual and rare mental health illness. The DSM-5 reports its prevalence at only 1.5% of the population. Dissociation is a state of being disconnected or separated from oneself and is a symptom of several over mental health disorders, such as Dissociative Amnesia, Depersonalization/Derealization Disorder, and PTSD. This disorder is associated with traumatic events or abuse. In addition to that, individuals with DID have a very high frequency of suicidal thoughts and behavior.

Dissociative Identity Disorder is characterized by a discontinuity of sense of self and a disruption of personality states in which each state has altered and distinct affect, behavior, memory, perception and cognitive functioning. Recurrent loss of memory, important personal facts, or trauma is present outside the scope of normal forgetting. This disassociation causes marked distress in daily functioning and is not due to the effects of a substance or medication. In addition, these disturbances are not part of a widely accepted religion or culture (e.g., childhood imaginary friend)

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What is Dissociative identity disorder? Or Multiple Personality Disorder? with Kati Morton