Bony Abnormalities: Bone spurs or variants in the shape with the acromion can result in increased friction and impingement. Ice is better on the onset of injury as it can help to scale back swelling and alleviate pain. Warmth is preferable down the line, since it encourages healing by expanding https://www.theorthopaedicandpainpractice.com/is-my-shoulder-pain-caused-by-a-rotator-cuff-tear/