If you have pain in the muscles under the right shoulder, you should first clarify whether you have suffered any trauma. Trauma can cause localized soft tissue damage as well as muscle damage under the right shoulder, resulting in symptoms of pain in the muscles around the shoulder. If the rotator cuff injury is caused by chronic strain or trauma, for example, injury to the right subscapularis muscle, there will be pain in the muscles below the shoulder joint. Secondly, if the patient suffers from frozen shoulder, together with damage to the soft tissue under the right shoulder, which causes pain in the shoulder joint and surrounding soft tissue under the right shoulder, there will also be limited movement of the shoulder joint. The muscle pain under the right shoulder is also not excluded due to the nerve compression caused by cervical spondylosis, which results in radiating muscle pain under the right shoulder. If there is no relief or progressive aggravation within a short period of time, you must go to a regular hospital in time to choose a reasonable treatment method after a clear diagnosis.