Some people with Parkinson's disease experience a movement disorder called dystonia, a secondary motor symptom. This condition causes involuntary, repetitive muscle movements that twist the body into specific postures and prevent a person from moving the way they want to. It can be, but isn't always, painful. Dystonia may affect the eyes, neck, torso, and limbs. However, dystonia can also be a symptom of brain lesions, medication side effects, and genetic disorders.

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