(HealthDay News) - A tremor is an uncontrolled, involuntary, rapid movement of a muscle, and can be caused by a medication or certain conditions such as Parkinson's disease.
Here are common signs of tremor, courtesy of the U.S. National Library of Medicine:
- Frequent, uncontrolled shaking of the hands, eyelids, head, arms or muscles.
- Shaking on one side of the body, or with a different severity on each side of the body.
- Shaking that occurs occasionally, intermittently or temporarily rather than constantly.
- Nodding or quivering of the head.
- Shaking that stops during sleep.
- Worsening of shaking symptoms during stress.
- A shaking or quivering sound to the voice.