Shoulder pain may be caused by physiological phenomenon, frozen shoulder, cervical spondylosis and other reasons. 1. Physiological phenomenon: It may be due to long-term poor posture, overweight physical labor and other reasons, causing shoulder muscle congestion, stiffness, and thus the phenomenon of shoulder pain. 2. Frozen shoulder: a disease characterized by limitation of both active and passive activities of the shoulder joint. Due to the stimulation of inflammation, patients may experience shoulder pain, and with the development of the disease, shoulder stiffness may occur. 3. Cervical spondylosis: It is mainly caused by long-term strain on the cervical vertebrae, osteophytes and herniated intervertebral discs. Patients may experience neck stiffness and pain, and in severe cases, it may extend to the shoulders and cause soreness and pain. Patients with shoulder pain can also be seen in arthritis and other causes, it is recommended that patients go to the hospital emergency room in a timely manner, follow the doctor’s instructions for treatment, to avoid delaying the condition.