Dissociative identity disorder, or DID, may result from disruptions in memory caused by psychological trauma.
 DID is often initially misdiagnosed because clinicians receive little training about dissociative disorders or DID, and often use standard diagnostic interviews that do not include questions about trauma, dissociation or post-traumatic symptoms
"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

