Definition and Diagnosis
Dissociative identity disorder is characterized by disruption of identity marked by the presence of two or more distinct personality states, with marked discontinuity in sense of self and agency, accompanied by recurrent gaps in recall of everyday events, personal information, or traumatic events.
Epidemiology
Dissociative identity disorder is relatively rare, with community prevalence estimates around 1-1.5%, and is strongly associated with a history of severe, chronic childhood trauma, particularly abuse.
Risk Factors
The primary recognized risk factor is severe, repeated childhood trauma (physical, sexual, or emotional abuse, or profound neglect), occurring at a developmental stage before a cohesive sense of identity has consolidated.
Symptoms and Subtypes
Features include distinct identity states that may have their own name, age, or characteristics, marked gaps in memory for personal history, and, at times, symptoms resembling other conditions such as depersonalization, mood instability, or post-traumatic symptoms.
Diagnosis
DSM-5-TR criteria require disruption of identity with two or more distinct personality states, recurrent gaps in recall, symptoms causing significant distress or impairment, and exclusion of substance effects or a culturally sanctioned practice.
Treatment
Treatment is primarily long-term, trauma-focused psychotherapy aimed at stabilization, safety, processing of traumatic material, and integration or coordinated functioning among identity states; medication may target co-occurring symptoms such as depression or anxiety but does not treat the dissociation itself.
Prognosis
Course is often chronic, particularly without treatment, but many individuals achieve meaningful improvement in stability and functioning with sustained, specialized trauma-focused therapy.
Reference
Sadock, B. J., Sadock, V. A., & Ruiz, P. Kaplan & Sadock's Synopsis of Psychiatry (11th ed.).