Tremor is the most common movement disorder. In , James Parkinson characterized the tremor in his essay on the shaking palsy as "involuntary tremulous motion in parts not in action. Tremor is defined as a rhythmic, involuntary, oscillating movement of a body part occurring in isolation or as part of a clinical syndrome. In clinical practice, characterization of tremor is important for etiologic consideration and treatment. Common types include resting tremor, postural tremor, kinetic tremor, task-specific tremor, and intention tremor. Resting tremor occurs when a body part is at complete rest against gravity. Tremor amplitude decreases with voluntary activity. Examples of resting tremor are provided in Box 1. Postural tremor occurs during maintenance of a position against gravity and increases with action.
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