Tremor
Tremor is a condition where groups of muscles contract rhythmically in sequence, making the affected body part move repeatedly, do that the head nods or shakes, and the fingers move from side to side. While it may be a manifestation of diseases causing chorea (see Chorea - Huntington’s disease in this section) in children it is more usually a side effect of drugs such as those used to treat asthma, or simple excitement. In the adolescent it may be caused by over-activity of the thyroid gland. The common cause in adulthood - benign familial tremor - does not appear in the young.
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