Abnormal neuromuscular conditions characterized by disorganized or excessive movement (also known as hyperkinesia). Forms of dyskinesia include sudden, brief, "shock-like" muscle contractions (myoclonus); involuntary, rhythmic, oscillatory movements of a body part (tremor); rapid involuntary jerky movements (chorea); relatively slow writhing motions (athetosis); or abrupt, purposeless, simple or complex muscle movements or vocalizations (motor or vocal tics).

pathologic invulontary movements sometimes present at rest but always increased by the attempt to perform a voluntary movement and by stress; thay are usually absent during sleep. According to their distribution and frequency, they may be defined as tremor, dystonia, chorea, atethosis or myoclonus. Dyskinesias result from a dysfunction of those brain structures implied in the control of movement. Myoclonic jerks experienced while falling asleep are a benign condition.

abnormal, involuntary movements of voluntary muscles (may involve face, neck, hands, arms, legs, etc.) including twitches, jerks, twisting, or writhing movements.

Abnormal and involuntary movements that may occur in Parkinson's disease--resulting in fragmented or jerky motions that are different from the rhythmic tremor commonly associated with PD

abnormal involuntary movements that can result from long-term use of high doses of levodopa.

Involuntary, uncontrollable, and often excessive movement. These movements can be lurching, dance-like or jerky, and are distinct from the rhythmic tremor commonly associated with Parkinson's disease. A common side effect of many drugs used to treat Parkinson's disease.