Shoulder pain is a common symptom, especially among middle-aged and elderly people. Many people’s first reaction to shoulder pain is frozen shoulder, and they exercise blindly, but exercising blindly before the diagnosis is clear will usually aggravate the pain and worsen the condition. True frozen shoulder accounts for only one or two out of ten patients with shoulder pain, and the pain usually does not last more than two years. If you come across “frozen shoulder” that lasts for one or two years, then first of all, congratulations: this is not “frozen shoulder”, and then you have to find out what causes your shoulder pain. Then we need to find out what is causing your shoulder pain. There are many causes of shoulder pain, and the common ones are as follows: 1. Acromioclavicular impingement syndrome Acromioclavicular impingement syndrome (AIS), which is one of the most common causes of shoulder pain, is caused by the impact of the upper arm bone and the shoulder bone on each other when the arm is lifted up. The main manifestation is chronic dull pain in the front of the shoulder, pain is obvious when lifting the arm and rotating the shoulder joint, and there is usually a noise, feeling soreness and pain, and if there is a tendon tear there will be a weakening of the strength of the upper arm. If left untreated, the usual consequence is to rupture the shoulder tendon by repeated crushing and wear and tear, developing a rotator cuff injury. Acromioclavicular impingement syndrome can be treated by physical therapy, medicine, closure, rest for the first time, if repeated attacks, need to perform minimally invasive surgery for acromioplasty to completely solve the basis of the lesion. 2, rotator cuff injury rotator cuff consists of 4 muscles around the shoulder joint, they are wrapped around the shoulder joint like a cuff to maintain the dynamic balance of the shoulder joint. Rotator cuff injury is mainly caused by trauma (e.g. hand support when falling, or sudden lifting of the shoulder joint when holding heavy objects, etc.), aging and degeneration, etc., and a large portion of it is also developed from long-term shoulder impingement. Some patients with rotator cuff injury have no obvious pain, just weak shoulder force; there are also some patients with severe pain, difficult to sleep, usually upper arm or even elbow joint pain, rather than shoulder pain. The first incidence of rotator cuff injury can try conservative treatment for 3 months, and if the conservative treatment is not effective, surgery is needed to repair the damaged muscle. 3, biceps long head tendonitis often occurs in the long-term repeated over-activity of the population, can be due to trauma or acute onset of strain, mostly due to the tendon long term wear and tear and the result of degenerative changes. The main clinical manifestations are pain in the anterior part of the shoulder joint, which can radiate to the anterolateral aspect of the upper arm, aggravated at night, aggravated by shoulder activities, and improved after rest. In the acute stage, the pain is severe and it is difficult to put on or take off clothes. At the beginning, there is no obvious limitation of shoulder joint activities, but gradually aggravated, shoulder joint activities are limited, and it is even difficult to put on and take off clothes. Most of them can be treated conservatively in the early stage, and arthroscopic minimally invasive surgery is feasible for individual cases of persistent biceps long head tendonitis. 4, adhesive capsulitis this is the famous “frozen shoulder”. Mainly manifested as shoulder pain, limited activities, serious washing, dressing difficulties, the condition gradually aggravated. Although the pain, but can not say exactly where the pain, and there is no clear pressure point. The treatment is mainly physiotherapy, functional exercise, anti-inflammatory pain relief, closure and other treatments, and arthroscopic minimally invasive loosening can be used in some serious cases, with reliable results. “Frozen shoulder” is a self-limiting disease, usually less than two years, but if the exercise is not in place, treatment is not timely, before the end of the disease can develop into a serious stage, and even disability. 5, cervical spondylosis cervical spondylosis is due to cervical spine lesions compression of nerves, blood vessels caused by a series of lesions, clinical manifestations are diverse, mostly neck and shoulder pain, numbness of the upper limbs, dizziness, etc. But usually there is no limitation of shoulder joint movement. However, there is usually no limitation of shoulder joint activity, which needs to be clearly diagnosed by specialized doctors. 6. The involving pain caused by internal organs, such as gallbladder lesions, coronary heart disease, myocardial infarction, mediastinal tumors and other lesions can cause shoulder involving pain, which need further examination and clear diagnosis, so as not to miss the diagnosis, misdiagnosis and delayed condition.