Usually people think that the shoulder cannot be lifted is “frozen shoulder”. But are there really so many “frozen shoulders”? In fact, we should understand this type of disease correctly. The clinical incidence of frozen shoulder only accounts for about 10% of shoulder pain, so let’s sort out the common diseases that cause shoulder pain. Frozen shoulder: “Frozen shoulder” is a kind of adhesive capsulitis, which is currently referred to as frozen shoulder, some of which is caused by trauma, most of which is of unknown origin, and can seriously affect the patient’s quality of life. It is most common in clinical practice and is commonly known as frozen shoulder. It usually occurs between the ages of 40 and 50, with a slow onset of dull pain around the shoulder, with nocturnal pain and gradual difficulty in shoulder movement. The most obvious obstacle is forward flexion and abduction, external rotation and internal rotation and extension of the shoulder joint. The patient was unable to comb her hair, wash her face, or bathe. Difficulty in using chopsticks, dressing, etc. The pathology is contracture of the shoulder capsule, especially of the rostral shoulder ligament. The disease is self-limiting and can be treated with non-steroidal anti-inflammatory and analgesic drugs along with physical therapy and sports exercise when the symptoms are obvious, and the shoulder function is completely normal. It is due to the impact of the rotator cuff tissue on the front 1/3 of the shoulder and the rostral shoulder ligament when the shoulder joint is lifted and abducted, the hyperplasia of various bone tissues or soft tissues in the subacromial space makes the subacromial space narrow and complicates the bursitis, most of the active activities of the shoulder are not affected, and the pain can be induced when the shoulder is flexed and abducted, mainly in the front and lateral shoulder. The pain is mainly from the anterior shoulder to the elbow. A supraspinatus exit radiograph can reveal local abnormal structures. Local injection of sodium vitrate is effective, and local injection of Depo-Provera plus lidocaine can also be used. If necessary, acromioplasty is performed. Rotator cuff injury: Rotator cuff refers to the tendon tissue within the shoulder joint, including supraspinatus, infraspinatus, teres minor and subscapularis muscles. The main manifestation is recurrent or persistent shoulder pain, which is aggravated at night and cannot sleep to the affected side. In younger people, it is mostly caused by sports injuries, such as throwing movements and overhead racket swinging, while in middle-aged and elderly people, it is often caused by rotator cuff degeneration. It is easy to confuse this disease with frozen shoulder clinically. There is weakness in shoulder abduction and forward elevation and limited joint movement; those with complete rotator cuff rupture experience significant pain in the abducted shoulder joint arc 60-120 degrees. Complete rotator cuff injury is difficult to treat. Long head biceps tendon injury : Located at the tendon in the intertrochanteric groove of the humeral tuberosity. While in traumatic glenoid labrum injury rupture, severe shoulder pain, pain radiates to the upper arm to the elbow joint, physical examination reveals localized deformity and pressure pain in the upper arm, flexion of the elbow is weak or cannot be, while in chronic rupture the flexion force gradually decreases, local closure is effective in chronic injury, complete rupture requires surgical repair. 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 aspect of the shoulder, which may radiate to the deltoid stop or the upper arm. Restriction of shoulder joint movement is not obvious, and the pressure point is most obvious at the greater tuberosity of the humerus, which can be found on X-ray. Physiotherapy and local closure are effective, and surgery if necessary. Osteoarthritis of the acromioclavicular joint: The onset of the disease is slow and manifests itself as pain during shoulder activity, which is not obvious at rest. The painful pressure site is in the acromioclavicular joint space, and there may be joint effusion. The passive activity of the shoulder joint is not affected, and degenerative changes of the joint can be detected by X-ray. Local closure, physiotherapy, rehabilitation exercise and medication are used. If systematic conservative treatment is ineffective, surgery will be performed. Shoulder osteoarthritis: The onset of the disease is slow, and it is characterized by pain during shoulder activities. Degenerative changes of the joint can be detected on X-ray, which can be relieved by early intra-articular injection of sodium vitreous acid.