A member asked:

Im 17. sometimes when im relaxing either my right or left arm a part of the arm would start thumping up and down. what is this?

A doctor has provided 1 answer

Fasciculation: It's likely a fasciculation...similar to cramp or spasm but instantaneous. Usually they are related to recent overuse, some medications or drug use (caffeine among them), and in rare cases to a neuromuscular condition. if they persist talk to your doctor but they are almost always intermittent and benign.

Answered 4/9/2020

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