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Abnormal involuntary movements, also known as dyskinesia, of several different varieties with different clinical appearances, underlying causes and treatments modalities are seen in clinical practice. Common ones are tremor, chorea, athetosis, dystonia, hemiballismus and myoclonus. Extrapyramidal system plays a major role in voluntary movements. Involuntary movements are associated with degenerative brain disease or are caused by an injury or altered metabolism in the extrapyramidal system. Their aetiology is often unknown. Recently, however, some genetic causes have been identified. Involuntary movements are often resistant to treatment.