Shoulder pain plagues many young and middle-aged patients, especially the middle-aged and elderly. The following is a rough introduction to help you understand these diseases properly: Shoulder periarthritis is the most common, commonly known as fifty shoulder, frozen shoulder, etc. It starts slowly with dull pain around the shoulder, which is aggravated at night, and even wakes up with pain. Gradually, the shoulder becomes difficult to move. Abduction, rotation and posterior extension are the most obvious obstacles. The patient is unable to comb the hair, wash the face, or bathe. The patient has difficulty in carrying dishes and chopsticks and in dressing and lifting pants. The pathology of the disease is contracture of the shoulder capsule, especially of the rostral shoulder ligament. However, the disease is self-limiting, and physical therapy and exercise treatment are feasible when the symptoms are obvious, and the function is completely normal after recovery. 1.Subacromial impingement syndrome: It is one of the main causes of chronic shoulder pain, due to the impact of rotator cuff tissue on the front 1/3 of the acromion. rotator cuff impingement area is mainly concentrated in the supraspinatus muscle attached to the greater tuberosity of the humerus, and various bone tissue or soft tissue proliferation, various protrusions (bone spurs, bone redundancy, thickened tendons, etc.) narrow the subacromial gap, which leads to wear or tear of the rotator cuff. The clinical symptoms caused, including shoulder pain, and the nature of the pain are difficult to distinguish from other shoulder disorders. However, most of the active activities of the shoulder in this disease are not affected, only the pain can be significantly induced when the shoulder is lifted forward. 2, rotator cuff injury: rotator cuff refers to the tendon tissue within the shoulder joint, including supraspinatus, infraspinatus, small garden muscle and subscapularis. The main manifestation is recurrent or continuous shoulder joint pain, which is aggravated at night and cannot sleep on the affected side, very similar to the symptoms of frozen shoulder. It is easy to confuse this disease with frozen shoulder clinically. However, the motor dysfunction of the disease differs from that of frozen shoulder in that the strength of the abductor shoulder and anterior lift muscles is reduced and joint movement is limited; in cases of complete rotator cuff rupture, there is a significant painful arc in the abductor shoulder joint. Orthopedic surgeons can also distinguish the two diseases through physical examination. 3.Biceps long head tendon rupture rupture : Mostly located at the tendon in the intertrochanteric groove of the humeral tuberosity. In acute traumatic rupture, the shoulder is prone to severe pain, which can radiate to the upper arm to the elbow joint, and the examination department finds localized bulging and depression deformity of the upper arm, loss of active elbow flexion function, weakened muscle strength, and flabby muscle belly. In the case of chronic rupture, the elbow flexion force is gradually weakened, and local examination can reveal the ruptured tendon. 4. Calcific supraspinatus tendonitis: It refers to the deposition of calcium salts in the supraspinatus tendon above the greater tuberosity of the humerus, which also manifests as shoulder joint pain, with pain predominantly in the lateral shoulder, which can radiate to the deltoid stop or the upper arm. It is difficult to distinguish from frozen shoulder and the symptoms vary, sometimes there are no symptoms and they are detected only through photographs. However, the limitation of shoulder joint movement is not obvious, and the pressure pain point is most obvious at the greater tuberosity of the humerus. 5. Degenerative changes of the acromioclavicular joint: caused by chronic injury to the acromioclavicular joint or sequelae of acute acromioclavicular joint dislocation. It is clinically manifested as pain when the shoulder is active, but the pain is not obvious when it is stationary. The pressure site of this pain is located in the acromioclavicular joint space. Passive movement of the shoulder joint is not affected. This type of disease is often repeatedly diagnosed and treated in multiple departments such as rehabilitation, Chinese orthopedics, pain, neurology, and orthopedics. However, doctors in different departments of the same hospital may give different diagnoses, leaving patients at a loss as to what to do and giving different treatment plans. Therefore, for shoulder lesions, patients should visit an orthopedic specialist in the upper extremity, through their professional examination, and the necessary auxiliary tests can clarify the correct diagnosis, the treatment of the disease includes conservative treatment and surgery. The treatment of this disease includes both conservative and surgical treatment. It is also up to the specialist to help you decide on the specific method to be used.