Clinically and in our lives, people often have the misconception that shoulder pain is “frozen shoulder”. In reality, it is not! In clinical practice, shoulder pain is a complex group of conditions, which is a manifestation of many diseases in the shoulder joint. There are many diseases that can cause shoulder pain. First of all, factors other than the shoulder can cause shoulder pain, such as: 1. Visceral origin of shoulder pain: apical lung tumor, subdiaphragmatic lesions (such as liver abscess, cholecystitis, gastric fundic pancreatic cancer invading the diaphragm, etc.), mediastinal lesions including heart disease (such as angina pectoris, etc.). 2. Neurogenic: such as cervical spondylosis, spinal cord cavitation, cerebral infarction, etc. Second, many systemic diseases can also cause shoulder pain, such as rheumatoid arthritis, rheumatoid arthritis, osteoarthrosis, etc. The characteristic of these shoulder pains is that they often coexist with other joint pains. Of course, the most common type of pain is caused by lesions of the shoulder joint and its surrounding tissues themselves. These include shoulder tumors (e.g., ligamentous fibroma, osteosarcoma, etc.), inflammation (septic arthritis, frozen shoulder, calcific tendonitis, etc.), and injury (e.g., fracture, impingement syndrome, rotator cuff tear, glenoid labrum injury, biceps tendonitis or rupture, acromioclavicular joint injury and dislocation, etc.). So, what exactly is “frozen shoulder”? At present, the diagnostic usage of “frozen shoulder” is rather confusing, but there are three general meanings: First, it is shoulder pain, but the diagnosis is unclear, that is, a “waste paper basket” diagnosis, a diagnosis that is not well understood, which is still relatively common in China. Secondly, it refers to the pain syndrome that causes shoulder dysfunction, i.e. “frozen shoulder” in the broad sense, which has been used less and less and has been replaced by a more accurate diagnostic term. These include: rotator cuff tears, calcific supraspinatus tendonitis, subacromial bursitis, biceps longus tendon tenosynovitis, rostral or rostro-humeral ligamentitis, frozen shoulder, acromioclavicular arthritis, suprascapular nerve entrapment, subacromial impingement, and other specific localized and qualitative terms. The third term is specifically “frozen shoulder”. The exact cause of “frozen shoulder” is not known, but it may be related to autoimmune reaction or endocrine disorder. For example, many people with diabetes are found to have poor glycemic control. In general, patients feel that there may be no cause. As long as the shoulder joint is made immobile or less mobile, the disease may occur over time. As a result of the lack of movement of the joint, local metabolism is impaired and blood and lymphatic circulation is blocked, resulting in degenerative changes, exudation and fibrosis around the joint such as the joint capsule, rotator cuff, biceps tendon and rostro-humeral ligament, which greatly limits the movement of the shoulder joint. This disease is also known as “fifty shoulder” because of its high incidence around the age of fifty, and in Chinese medicine it is called “frozen shoulder” or “leaky shoulder”. The main symptom is pain in the shoulder, especially at night. There is a significant restriction in the forward flexion, abduction and internal and external rotation of the shoulder joint. Over time, deltoid atrophy can occur, and the patient will have dysfunction in raising the arm, washing the face, combing the hair, and tying the buckle. Therefore, for shoulder pain, it is important to see a specialist in time for examination and diagnosis before treatment to avoid delaying the condition.