A neurological movement disorder characterized by prolonged or intermittent muscle contractions that cause abnormal, frequently repetitive movements, postures, or twists. Involuntary muscle contractions can affect one part of the body (focal dystonia), several adjacent parts (segmental dystonia), or the whole body (generalized dystonia). The disease can be primary (idiopathic) or secondary, occur as a result of other neurological diseases, medication or injuries. Symptoms are often exacerbated by voluntary movements and can lead to significant disability and pain. Diagnosis is made on the basis of the clinical picture, history and neurological examination. Treatment includes drug therapy (anticholinergic drugs, muscle relaxants, botulinum toxin injections), physical therapy, and in some cases, deep brain stimulation.