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Tremor: classification, diagnosis and management.

Tremor can range from imperceptible physiologic movements to severely handicapping shaking. It can be a single entity, or it can occur in association with a disease that affects the basal ganglia, brainstem, cerebellum or peripheral nervous system. Tremors can be classified according to their anatomic location, the circumstances under which they occur, their frequency and amplitude, and whether they are physiologic or pathologic. As an isolated disorder, tremor should be treated only when it impairs the patient's ability to perform activities. Successful treatment requires the identification of precipitating factors, as well as associated signs and symptoms.