A rotator cuff disorder causes pain and weakness in your shoulder. It may be uncomfortable or impossible to do everyday activities, such as combing your hair, tucking in your shirt, or reaching above your head.
Most often, you will feel the pain on the side and front of your upper arm and shoulder. You may have pain during the night and have trouble sleeping on that side. Pain is almost always worse when you make overhead movements.
Because of the pain, you may try not to use your arm. And that can cause even more weakness and stiffness in the shoulder.