Shoulder periarthritis is a chronic non-specific inflammation of the shoulder capsule and its surrounding ligaments, tendons, and bursae, which is characterized by stiffness and dull pain in the affected shoulder, intensifying at night, radiating to the upper extremity of the affected side to the upper arm and hand, and accompanied by impaired movement of the shoulder joint. “Frozen shoulder”. The scope of frozen shoulder is quite broad and includes three kinds of pathological changes: first, chronic non-specific inflammation of the muscles, tendons and ligaments surrounding the shoulder joint, including biceps tendonitis, supraspinatus fasciitis, infraspinatus fasciitis, lesser round muscle myofasciitis, subscapularis fasciitis and rotator cuff injury; second, bursitis, including subacromial bursitis and subdeltoid bursitis; third, shoulder capsulitis, which refers to the shoulder capsule itself The chronic non-specific inflammation of the shoulder capsule itself. The main differential diagnoses of frozen shoulder are: i. Cervical spondylosis: Many patients with cervical spondylosis have clinical manifestations of neck and shoulder upper extremity pain, which is more difficult to differentiate. Especially in the diagnosis of patients with both cervical spondylosis and frozen shoulder, it is easy to miss the diagnosis of frozen shoulder. Second, thoracic outlet syndrome: many patients with thoracic outlet syndrome clinically present with neck and shoulder upper extremity pain, which is more difficult to identify. Third, upper thoracic occupying lesion: The early clinical manifestation of upper thoracic occupying lesion is shoulder pain on the affected side, which is poorly treated according to frozen shoulder.