What is dissociative identity disorder? Dissociative identity disorder (DID), formerly known as multiple personality disorder and split personality disorder, is a mental health condition where you have two or more separate identities. Dissociative identity disorder (DID), previously known as multiple personality disorder (MPD), is a dissociative disorder characterized by the presence of at least two personality states or "alters".

Understanding the Context

The diagnosis is controversial and remains disputed. [4][5][6] Proponents of DID support the trauma model, viewing the disorder as an organic response to severe childhood trauma. Critics of the ... Learn about dissociative identify disorder symptoms, tests, specialists and treatment.

Key Insights

Read about dissociative identity disorder (formerly multiple personality disorder or split personality disorder) causes, diagnosis, treatment, and prognosis. DID symptoms include memory lapses, blackouts, feeling unreal, and losses of time. DID is a treatable disorder once it is properly diagnosed. Clinicians who understand DID symptoms can diagnose DID in the clinical interview. There are also paper and pencil tests that can help clinicians diagnose DID and other dissociative disorders.

Final Thoughts

Studies show that DID symptoms improve over time when treated using Phasic Trauma Treatment. Understanding DID DID is complex—but with the right knowledge, clinicians, caregivers, and communities can play a meaningful role in healing. This on-demand session clarifies DID’s clinical realities, reduces stigma, and offers grounded, evidence-based strategies for support. Dissociative identity disorder (DID) is the disorder that was previously recognized as multiple personality disorder. It’s characterized by the presence of two or more dissociated self states, known as alters, that have the ability to take executive control and are associated with some degree of inter-identity amnesia.