Muscle strain?: What kinds of activities have you been engaging in? Did you by chance travel and carry things on the right side more than you typically do? Do you play a sport? Did you sleep very soundly without moving? All these things and more can cause a spasm of the muscles, usually on the side of your dominant hand. If you had a fall, you should have a doctor take a look to make sure you don't have fracture.
Answered 10/28/2014
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