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A functional neurologic disorder or functional neurological disorder is a condition in which patients experience neurological symptoms such as weakness, movement disorders, sensory symptoms and blackouts. Symptoms of functional neurological disorders are clinically recognisable, but are not categorically associated with a definable organic disease. The intended contrast is with an organic brain syndrome, where a physiological cause can be identified. Subsets of functional neurological disorders include functional neurological symptom disorder , conversion disorder, and psychogenic movement disorder/non-epileptic seizures. Neurological symptoms which are unexplained by organic disease are common in neurological services, accounting for up to one third of outpatient neurology clinic attendances, and associated with as much self-reported disability and distress as those caused by organic neurological disorders.The diagnosis is made based on positive signs and symptoms in the history and examination during consultation of a neurologist. Physiotherapy is particularly helpful for patients with motor symptoms and tailored cognitive behavioural therapy has the best evidence in patients with dissociative attacks.