Muscle strain: Possible a muscle strain or rotator cuff injury. It depends on how long this has been going on and if there was any inciting trauma such as lifting or carrying something heavy which could have brought it out. I'd say more info and having a doctor evaluate it is the best course of action.
Answered 4/4/2016
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3 doctors weighed in across 2 answers
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A doctor has provided 1 answer
A doctor has provided 1 answer
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