A rotator cuff injury can cause a dull ache in the shoulder, which often worsens with use of the arm away from the body. Motions like combing your hair or reaching behind your back can be difficult and painful. Rotator cuff injuries are more common as we age, especially for people working in a job that uses repetitive overhead movements. Rotator cuff surgery is an option when non-surgical treatment is no longer effective in reducing pain or maintaining mobility.