Only a guess: Perhaps a small muscle tear or pull - like a hernia. If possible since rest helps, he should give it as much rest time as possible - certainly not overdo demanding activity. An exam can be helpful to rule out anything more serious. Best!
Answered 1/21/2016
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2 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
2 doctors weighed in across 2 answers
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