Shoulder pain is a painful sensation in and around the shoulder joint of a patient. There are many causes of shoulder joint pain, and generally speaking, they can be divided into local causes of the shoulder joint and causes outside the shoulder joint. In addition to local tumors or infections, the common causes are acute and chronic injuries to the shoulder joint and its surrounding structures, including bone, cartilage, muscles, tendons, ligaments, fascia, neurovascular, etc. The main diseases include osteoarthritis, joint instability, shoulder impingement syndrome, rotator cuff injury, tendonitis, tenosynovitis, nerve entrapment syndrome, glenoid labral injury, fracture or occult bone injuries, etc. The clinical manifestations are often localized pain, with or without limitation of shoulder joint movement. There is a clear correlation between local symptoms and joint activity, i.e. shoulder activity can aggravate symptoms and local braking can reduce them. The cause of external shoulder joint pain is usually caused by radiating or involving pain, and can also be a manifestation of systemic disease in the shoulder joint. The usual diseases are cervical spondylosis, thoracic spondylosis, diseases of the thoracic and abdominal organs, rheumatic immune system diseases, metabolic diseases, tumors, infections, etc. Clinically, the patient may have some underlying medical history, accompanying signs and symptoms of other systems, and the corresponding auxiliary tests may be abnormal. However, the clinical situation of shoulder pain varies widely. Regardless of the condition of shoulder pain, the doctor needs to collect medical history, symptoms, physical examination, and auxiliary examinations for comprehensive analysis and identification, and finally make a clear diagnosis.