A common cause of shoulder pain is soreness of the tendon (a cord that attaches a muscle to a bone) of the rotator cuff (the part of the shoulder that helps circular motion).he main joint in the shoulder is formed by the arm bone and the shoulder blade. The joint socket is shallow, allowing a wide range of motion in the arm. The rotator cuff is made up of 4 muscles that surround the arm bone. This cuff keeps the shoulder steady as the arm moves.
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