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Rhythmic, unintentional, rapidly alternating flexion and extension of opposing muscles in one or more parts of the body, often the hand or jaw.

Example: A teacher’s extended right hand shakes. Her writing has become illegible, and her symptoms worsen when she drinks coffee.

APA Reference
Grinnell, R. (2018). Tremor. Psych Central. Retrieved on July 8, 2020, from