The rotator cuff is a group of four muscles which helps you to stabilise and transfer the shoulder joint. Rotator cuff injuries can range between shoulder impingement/ tendinitis to partial or total tears. Often, all you are able to do to deal with pain is to simply relaxation. More often https://www.theorthopaedicandpainpractice.com/is-my-shoulder-pain-caused-by-a-rotator-cuff-tear/