Why this subject needs context
The diagnosis now known as dissociative identity disorder, or DID, was formerly called multiple personality disorder. The terminology changed as clinicians and researchers revised how they described identity disruption, memory gaps and dissociative experiences.
Public discussion has also been shaped by books, films, therapy practices, media reports and disputes about recovered memories. Those influences make it especially important to distinguish a person’s reported experience, a diagnostic framework and claims about causes.
Language matters
Schizophrenia is not the same condition as DID. Schizophrenia is generally discussed as a psychotic disorder involving experiences such as delusions, hallucinations or disorganized thinking. DID is discussed in relation to dissociation, identity states and discontinuities in memory or self-experience. Neither term should be used casually as a label for unusual behavior.
Several explanations have been proposed
Accounts of DID have included trauma-related models, sociocognitive explanations, critiques of therapeutic suggestion and spiritual interpretations. These positions do not carry identical evidence, and a responsible summary should identify disagreement rather than present one explanation as settled fact.