Dissociative Identity Disorder (DID)
Dissociative Identity Disorder (DID) is a dissociative disorder and used to be called Multiple Personality Disorder. However, this condition is not a personality disorder, and so was renamed to reflect the fact that dissociation is the major feature of the condition.
DID is caused by repeated childhood trauma, usually interpersonal, before the ages of 7-9. An insecure attachment to caregivers or a failure to be soothed after the traumas increases the likelihood of it developing.
A person with DID may have different identities, sometimes referred to by people managing the condition as ‘alters’, which emerge in a variety of circumstances. Someone with DID will find that alters can take control of their thoughts and behaviours; often each alter will have their own name and distinct characteristics.
All alters inhabit the same body but they do not form one singular identity. It can sometimes be difficult for people to remember events that have occurred when a different alter has been in control of the body. Many systems have an identity that is “out” the most, often called the host identity. Some systems may have multiple hosts, others do not have one. It is one of the most widely misunderstood and stigmatised mental health conditions but with robust therapy and support, people can manage DID.
There are other Dissociative Disorders that stem from trauma, including Dissociative Amnesia, an inability to recall autobiographical information (usually related to a trauma) that goes beyond ordinary forgetting. A subtype of this is Dissociative Fugue, when a person enters a state in which they leave their home, assuming a new identity or experiencing identity confusion. Fugue states can last from days to years. Other Specified Dissociative Disorder encompasses symptoms typical of a Dissociative Disorder without meeting full criteria. Examples can include a DID-like presentation without amnesia; identity changes due to coercive persuasion; and trance-like states.