Dissociative identity disorder, or DID, may be the result of memory disruptions that have been induced by psychological trauma.
 Other conditions that often occur in people with DID include post-traumatic stress disorder, personality disorders (especially borderline and avoidant), depression, substance use disorders, conversion disorder, somatic symptom disorder, eating disorders, obsessivecompulsive disorder, and sleep disorders
"Interpersonality amnesia" was removed as a diagnostic feature from the DSM III in 1987, which may have contributed to the increasing frequency of the diagnosis

