In everyone’s perception, when it comes to shoulder pain, most people will definitely say that this person has frozen shoulder. Why is frozen shoulder known by so many people? This is inseparable from the probability of the disease occurring. In most of our lifetime, we may get frozen shoulder, but shoulder pain, is never as simple as frozen shoulder. Today I will briefly introduce shoulder disease, and hope you can understand it. The shoulder joint is made up of six joints, divided into the acromioclavicular joint, glenohumeral joint, acromioclavicular joint, sternoclavicular joint, rostraloclavicular joint, and interscapular thoracic wall joint. Because the humeral head is large and spherical and the articular glenoid is shallow and small, the shoulder joint consists of the humeral head and the articular glenoid of the scapula, which is a typical ball and socket joint. The glenoid is small and shallow, with a glenoid lip on the edge; the joint capsule is thin and loose, with the biceps longus tendon passing through the capsule; outside the capsule, there are rostro-humeral ligaments, rostro-shoulder ligaments and tendons to strengthen its stability, except for the lower part of the capsule, which has no ligaments or muscle strengthening and is the weakest, so when the shoulder joint is dislocated, the humeral head is often dislodged from the lower part and dislodged to the front. The joint surface varies greatly in size, and the capsule is weak and flaccid. There are about three ligaments and tendons connecting it, and the deltoid muscle is wrapped around the three sides of the shoulder peak. The shoulder joint is the most flexible ball and socket joint in the body and can be flexed, extended, retracted, extended, rotated and rotated in a circular motion. It can be flexed, extended, retracted, extended, rotated, and rotated. This is reflected by the large difference in area between the head of the joint and the fossa, and the thin and loose joint capsule. The shoulder joint is the most flexible ball and socket joint in the body and can be flexed, extended, retracted, extended, rotated, and rotated. It can be flexed, extended, retracted, extended, rotated, and rotated in a circular motion. The large difference in area between the head of the joint and the joint socket and the thin and loose joint capsule reflect its flexibility. A large number of muscles pass around the shoulder joint. These muscles are important for maintaining the stability of the shoulder joint, but the anterior and inferior muscles of the joint are fewer and the joint capsule is the most flaccid, so it is the weakest point for joint stability. Among shoulder disorders, rotator cuff injury is the most prevalent, followed by acromioclavicular impingement and shoulder instability. People who are more prone to the disease are athletes, people who frequently lift heavy objects, and people with traumatic injuries. The typical symptoms are pain in the neck and shoulder at night, pain in the upper arm, not daring to sleep on the affected side, or even being awakened by pain. When the shoulder joint is abducted, lifted or posteriorly extended, there is weakness, and sometimes even personal hygiene is difficult, which seriously affects the life of the patient. The most common disease in the area around the shoulder joint is cervical spine disorders. Studies have shown that patients with cervical spine disorders are significantly more likely to develop frozen shoulder, and patients with frozen shoulder are often associated with a significant decrease in lateral flexion and rotation of the ipsilateral cervical spine. In addition, other nearby diseases include heart disease and gallbladder disease. Heart disease such as myocardial infarction and angina pectoris can sometimes radiate to the left shoulder and be misdiagnosed as frozen shoulder. Gallbladder disease, gallstones, and cholecystitis pain radiating to the right shoulder may also be mistaken for frozen shoulder.