It’s not just a movement disorder. Besides causing tremors and other motion-related symptoms, Parkinson’s disease affects memory, learning, and behavior.

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Tremors are quivering, usually involuntary, movements. They may occur continually or may only appear at certain times. For example, tremors may appear during times of extreme emotion (e.g. trembling with fear).

Many patients with Parkinson's disease display "resting tremors", tremors that appear when the patient is at rest but are suppressed when the patient is moving.