Muscle related: Most common cause of pain in kids after playing soccer without any direct injury or hit to the side will be muscle over use or stretch and should resolve in couple of days try some most heat or hot shower and rest and see if it clears up if he was hit directly then it is different, he could them injure his ribs internal organs like kidneys spleen liver or bowles i hope that helps you good luck.
Answered 4/24/2015
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