My 16 year old son has recently developed some pain in his right hand. It only occurrs when he's snatching. He has absolutely no pain doing normal daily activities. The pain is on the inside portion of the thumb, under the meaty part of the thumb/palm, near the thumb joint. It's where the bar rest in the palm of his hand. He can do snatch pulls, clean pulls, clean & jerk etc. etc, without any problem what so ever. Any idea what my be causing this and a possible solution.