Dissociative identity disorder (DID) is a condition in which a person's identity is divided between two or more distinct personality states, with gaps in memory ordinary forgetting does not explain. It was previously called multiple personality disorder, a name no longer used clinically.
Key points
- DID is a condition in which identity is divided between two or more distinct personality states, with gaps in memory ordinary forgetting does not explain.
- It was previously called multiple personality disorder, a name no longer used clinically.
- Amnesia between states is the diagnostic core, and the part films and television usually leave out.
- How DID develops is disputed among researchers, though the experiences people report are not.
- People with DID are far more likely to be harmed, including by themselves, than to harm anyone.
Symptoms
- Two or more distinct personality states, with changes in voice, posture, mannerisms or apparent age when another state takes over.
- A sense of being influenced or spoken to from inside one's own mind, or detached from one's own body.
- Gaps in recall for ordinary daily events, lasting minutes to days; finding objects, messages or purchases with no memory of them.
- Flashbacks, nightmares, depression, anxiety, self-harm and suicidal thoughts.
Causes and risk factors
- The trauma model: repeated, severe trauma in early childhood leads a child to keep experience separated, persisting into adult life.
- About 90% of people diagnosed with DID report childhood abuse and neglect.
- The sociocognitive model argues DID is shaped by expectation, suggestion and cultural portrayals; the debate remains unresolved.
Treatment
- No NICE guideline covers DID; treatment follows general trauma and dissociation practice, usually phase-based over several years.
- Phase 1: safety and stabilisation. Phase 2: processing traumatic memories at a manageable pace. Phase 3: integration and rehabilitation.
- Specialist provision is scarce; most people are seen by community mental health teams rather than a dedicated dissociation service.
When to speak to a professional
- You regularly lose time, cannot account for events other people describe, or find your sense of who you are shifting uncontrollably.
- Seek help the same day if you are self-harming, thinking about suicide, or unable to keep yourself safe.
If you need help now: Samaritans, call 116 123, free, 24/7. Shout, text SHOUT to 85258. NHS 111, then choose the mental health option. Call 999 if anyone is in immediate danger.