Well, there is a thing that's like shin splints in your arms. Has something to do with the lining around the bone getting inflamed. This has been the case sometimes with people who have forearm pain during or after workouts. Nothing serious and ibuprofen, etc helps (and time) Just a thought.
The reason I mention it is it seems to me like punching the heavy bag could be exactly the kind of thing that could bring this on.
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