1) Abnormal involuntary movements which primarily affect the extremities, trunk, or jaw that occur as a manifestation of an underlying disease process. Conditions which feature recurrent or persistent episodes of dyskinesia as a primary manifestation of disease may be referred to as dyskinesia syndromes (see MOVEMENT DISORDERS). Dyskinesias are also a relatively common manifestation of BASAL GANGLIA DISEASES.

2) Difficulty moving; distortion or impairment of voluntary movement, as in tic, spasm, or myoclonus.

3) Abnormal involuntary motor processes that occur due to underlying disease processes.