Ok i've been getting the strangest pain in my upper right arm the past couple of days while im on the bag or sparring, i mean i can lift weights and its fine, throw straights n crosses n im fine, but as soon as i throw a right hook, on the moment of impact i feel that really nasty pain in my upper arm.

I've tried resting it and putting ice packs on it to no avail, just to mention it starts as a tingle to start then give it about 15 minutes and its a full blown pain right up the arse.

Anyone got an solutions?