Many things: You should see your doctor. Potential causes include focal motor seizures (especially if just one limb, or arm & legion same side), dystonia, or simple cramps from things like calcium deficiency. Only a medical evaluation can give you the answer.
Answered 12/6/2014
6.3k views
Systemic? Localized?: A pinched nerve can cause similar. Lack of certain nutrients , like potassium or calcium can cause similar. Do you have numbness or weakness? Would consider seeing a specialist, like a neurologist.
Answered 9/15/2013
4.9k views
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