Classification and diagnostic criteria of functional neurological disorder

Functional neurological disorder (FND) is a disorder of the autonomic motor or sensory system with well⁃defined symptoms, which covers functional movement disorder, psychogenic non⁃epileptic seizures, functional sensory disorder, functional cognitive disorder, persistent postural perceptual dizziness and so on. Its complex and diverse characteristics make the diagnosis and treatment of the disease and research difficult, so FND has long been a "gray area", but its high incidence, disability rate and high consumption of medical resources remind us that FND cannot be ignored. This paper reviews the current clinical classification of FND and the diagnostic criteria in order to improve the diagnosis and treatment by domestic colleagues.