+Tremor is an involuntary, rhythmic muscle contraction that causes a part of the body to shake. While often seen in the hands, it can affect the head, voice, or legs, and may be a sign of an underlying [Condition](/wiki/condition) or a [Nervous System](/wiki/nervous-system) issue.
+## See also
+- [Parkinson's Disease](/wiki/parkinsons-disease)
+- [Essential Tremor](/wiki/essential-tremor)
+- [Movement Disorder](/wiki/movement-disorder)
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