A tremor is an involuntary, somewhat rhythmic, muscle contraction and relaxation involving to-and-fro movements (oscillations or twitching) of one or more body parts. It is the most common of all involuntary movements and can affect the hands, arms, eyes, face, head, vocal folds, trunk, and legs. Most tremors occur in the hands. In some people, tremor is a symptom of another neurological disorder.
A very common kind of tremor is the chattering of teeth, usually induced by cold temperatures or by fear.
- More information on this topic is available at [ Wikipedia:Tremor ]
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