I'm a 15 year old varsity baseball player. I have severe bicep pain after pitching/throwing after about 5 throws. It weakens my arm all the way down through my hand. This has been going on for 2 years. I just had an MRI and it shows no injury or damage. Doctor says it's probably mechanics, but coach doesn't think I'm throwing wrong. I ice after practice and games and take naproxen. Doesn't help. I also play varsity football and have NO pain during football. Athletic trainer has tried everything, but still have the problem. Read an old post on here from 2007 saying it could be due to conditioning errors. Does anyone else have this problem and possible solution???