Muscle spasm..: Muscle fatigue/injury, over-used, poor blood circulation (i.E laying on arm too long while asleep), medication use, neurologic diseases/nerve compression, low potassium/calcium etc...Can cause muscle spasm. At times, no cause can be found. There are treatments, but you should get evaluated by doc first if this is bothersome/recurring for you. Keep well hydrated. Good luck.
Answered 6/30/2014
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