Rotator cuff injury with closed injections is usually not harmful if it is not frequent and multiple injections. If the pain of rotator cuff injury is severe, leading to activity limitation, usually the pain worsens after activity, and also cause serious shoulder joint dysfunction, it can be combined with the professional doctor’s treatment advice for closed treatment, which can effectively relieve the pain. Under normal circumstances, rotator cuff injury is better treated with closed injections, but frequent and multiple injections are not recommended, and a single injection will not be harmful to the body. At the same time, physical therapy can also be considered to assist in the treatment. It should be noted that, for serious rotator cuff injury, closed injection treatment is not effective, and may aggravate the degree of rotator cuff injury, it is recommended to go to a regular hospital as soon as possible to improve the relevant examination, by a professional doctor to conduct a detailed analysis and evaluation of the condition, and if necessary, consider surgical treatment.