Pain in the shoulder joint and its surrounding tendons and bones is called shoulder pain. If the pain behind the shoulder is often connected to the back of the scapula, it is called shoulder and back pain; if the shoulder pain affects the upper arm or even the elbow and hand, it is called shoulder and arm pain. Because shoulder pain is the main clinical manifestation and the pain in other parts is caused by shoulder pain, it can be collectively referred to as shoulder pain. The main causes of shoulder pain are as follows: 1. Intrinsic lesions of the shoulder joint. Degenerative diseases of the shoulder joint itself, especially local soft tissue degenerative changes, can be caused by painful restrictions on shoulder joint movement. 2. Long-term braking: Braking usually occurs after trauma or surgery. Not only shoulder or upper arm fractures, but also improper braking for too long after trauma can cause shoulder pain. In addition, heart surgery, thoracic surgery, female mastectomy and even hepatobiliary surgery can also cause frozen shoulder pain in the ipsilateral shoulder joint. 3.Neurological diseases: Many patients with neurological diseases such as hemiplegia have a higher incidence of shoulder pain. 4. Neighboring site diseases: A common neighboring site lesion is cervical spine disorders. Many studies have shown that patients with cervical spine disorders are much more likely to have shoulder pain. Other adjacent lesions that can cause shoulder pain include heart disease, pulmonary tuberculosis, and subphrenic disease. 5. Immune function changes: Some patients with frozen shoulder have relatively high related immune indicators, which may be related to the autoimmune reaction caused by fibrous degeneration after soft tissue injury around the shoulder joint. 6, endocrine system diseases: endocrine system diseases such as diabetes, hyperthyroidism or hypothyroidism are also closely related to frozen shoulder. 7, Psychological factors: Psychological factors such as depression, apathy or emotional trauma are also related to the occurrence of shoulder pain. In addition, a considerable number of shoulder pain patients are concentrated in manual work and other sedentary people, and long-term poor posture or postural disorders can lead to shoulder pain.