Functional neurologic disorder
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Functional neurologic disorder or functional neurological disorder (FND) is a condition in which patients experience neurological symptoms such as weakness, movement disorders, sensory symptoms, and blackouts. As a functional disorder, there is by definition no known disease process affecting the structure of the body, yet the person experiences symptoms relating to their body function. Symptoms of functional neurological disorders are clinically recognisable, but are not categorically associated with a definable organic disease.[1][2]
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The intended contrast is with an organic brain syndrome, where a pathology (disease process) can be identified which affects the body's physiology. Subsets of functional neurological disorders include functional neurological symptom disorder (FNsD), conversion disorder, functional movement disorder, and functional seizures. The diagnosis is made based on positive signs and symptoms in the history and examination during consultation of a neurologist.[3]
Physiotherapy is particularly helpful for patients with motor symptoms (weakness, gait disorders, movement disorders) and tailored cognitive behavioural therapy has the best evidence in patients with dissociative (non-epileptic) attacks.[4][5]