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Dissociative disorders matter because they describe a breakdown in the normally seamless integration of consciousness, memory, identity, and perception, usually following overwhelming stress or trauma. For example, imagine a woman who, after a violent assault, cannot recall large parts of that day despite having no head injury. That gap is not ordinary forgetting but a dissociative symptom. In practice, actively asking about a preceding trauma is a key step, since dissociative disorders very often follow one.

Dissociative amnesia is a reversible gap in memory for important personal information, too extensive to be normal forgetfulness, usually for a traumatic period. Dissociative fugue adds unexpected travel away from home alongside that amnesia, sometimes with assumption of a new identity. Dissociative identity disorder involves two or more distinct personality states that recurrently take control of the person's behaviour. DepersonalisationThe unsettling feeling of being detached from one's own body, thoughts, or sense of self.Read more →-derealisationThe unsettling feeling that the outside world feels unreal, distant, or dreamlike.Read more → disorder involves persistent feelings that oneself or the surroundings are unreal, WITH intact reality testing, the person knows the feeling is not literally true. Organic causes, such as a head injury or epilepsy, must be excluded before a dissociative diagnosis is made. Say a patient presents with a memory gap after a stressful bereavement, with a normal brain scan and no seizure history. The organic work-up is a required step before settling on a dissociative diagnosis, not an optional extra.

• A man describes feeling detached from himself, as if watching his life on a screen, while knowing this is not real. What is the diagnosis?
• Which condition does ICD-11 place within the dissociative disorders grouping?
• What is the recommended approach to treating a severe dissociative disorder following childhood trauma?

• Dissociative amnesia, a reversible memory gap for a stressful period, unlike organic amnesia from a head injury or seizure, which needs active exclusion first.
• Dissociative fugue, amnesia plus unexplained travel, rather than the amnesia alone seen in dissociative amnesia.
• Depersonalisation-derealisation, unreality of self or surroundings WITH intact reality testing, unlike psychosis, where conviction in a false belief is complete.
• Malingering, deliberately faked symptoms for external gain, whereas dissociative symptoms are not consciously produced.

• Reality testing is preserved here, unlike in a psychotic illness.
• Memory recovery through hypnosisA state of focused attention and relaxation sometimes used therapeutically to alter perception or behaviour.Read more → risks confabulationFilling a gap in memory with a made-up answer the person genuinely believes is true, not a deliberate lie.Read more → and is not recommended.
• No fixed false belief about the body is described.
• No distinct identity states are described.
• Memory and personal identity are intact.

• Extract the defining phenomenology, duration, severity and functional-impact clues.
• Match the pattern to the most specific diagnostic or assessment construct.
• Actively test the closest look-alike against the missing or contradictory clue.
• Choose the precise term rather than a broader category that is merely compatible.