Hi Nick. I'm not an orthopedist but have a little bit of medical background. At your age, I would say that it is a bit unusual to have repetitive shoulder discomfort after BP. If the soreness is the next day and not during or immediately afterwards, it is more reassuring. But if it is a regular occurrence then you should definitely see a physician for evaluation and opinion. To answer your question, it can be a little risky using Icyhot too regularly over a large surface area. The pain relieving substance is absorbed by your body and can build up over days and weeks causing a poisoning. Use in small areas for short or episodic time periods is safe. But again, it's kinda weird to be sore after BP unless you are really getting after it for an extended time period. I just asked my boys if they have ever been sore after BP... answer was no. Pitching yes. Hitting no.