Recently, shoulder pain may be related to the following reasons: First, there may be frozen shoulder, which is the most common clinical condition. Many patients have aseptic inflammation inside the shoulder joint due to trauma, cold or strain, which leads to frozen shoulder. The main manifestation of this type of disease is pain in the shoulder joint, and there is a significant restriction of movement. Patients are often unable to abduct and lift the shoulder joint, and there is pain and noise when they move. Secondly, cervical spondylosis may be present. Patients with cervical spondylosis may sometimes have radiating pain in the shoulder and upper extremity, and inflammation of the fascia in the neck, head, and back of the shoulder. Third, there may be arthritis of the shoulder joint, commonly known as rheumatoid, rheumatoid arthritis, gouty arthritis, etc. Fourth, there may also be internal diseases, such as acute myocardial infarction or angina pectoris, which may manifest as pain in the left shoulder. In the case of acute cholecystitis, there may be pain in the right side of the shoulder.