Functional (psychogenic) movement disorders
The term "functional" is used to describe abnormal movements believed to derive from an underlying psychological or psychiatric disorder. The DSM-5 classification of psychiatric disorders includes additional categories under which a functional movement disorder might reside, such as somatic symptom disorder, conversion disorder, illness anxiety disorder, and factitious disorders. Although tremor, dystonia, myoclonus, and gait disorders are among the most common presentations, tics, parkinsonism, abnormal ocular movements, palatal tremor, stereotypies, and hemifacial spasm can also be observed.
Sep. 26, 2021