Think I may have torn something in my shoulder the other day at work but I'm not sure. I can do most movements but when I move it in a certain direction it feels like my shoulder joint is on fire. I had been using a ratchet pretty much for 3 hours straight with my right arm and happened to be in a position to catch a 50 lb metal cover with my right arm to keep it from hitting the ground and since that I've had a considerable amount of pain in the shoulder joint. The muscles don't hurt at all but the joint does. I've had issues with it before working on my cars (to the point where I have to stop working and just lay there while the pain slowly passes.) but never this bad.