Right shoulder pain can be caused by the following reasons: First, frozen shoulder. Patients with frozen shoulder can experience shoulder pain, along with limited movement of the shoulder joint in all directions. Secondly, rotator cuff injury can lead to shoulder joint pain, along with shoulder joint lifting dysfunction and inability to lift the shoulder joint. Third, shoulder impingement syndrome can also cause pain in the shoulder joint, especially when the shoulder joint is abducted, so it is necessary to have an X-ray or MRI examination for diagnosis and treatment. Fourth, cervical spondylosis, cervical spondylosis can cause shoulder pain, so it is necessary to conduct cervical spine X-ray and nuclear magnetic examination for diagnosis and treatment. Fifth, myofasciitis, myofasciitis patients can also appear on the right side of the inner scapula pain, and can be radiated to the right shoulder and the right upper limb, often during exertion or sleep at night when the pain is more obvious pressure.