More than 30% of people over 60 years old have rotator cuff injury, and the more rotator cuff injury is treated as frozen shoulder, the more powerful the treatment will be. Shoulder pain is not always due to frozen shoulder, there are more than ten causes of shoulder pain. From a medical point of view, frozen shoulder, which is often mentioned, is actually an inflammatory change of joint capsule contracture and fibrosis, which is a sterile inflammatory disease that can be cured without treatment. The clinical incidence of frozen shoulder only accounts for about 5% of shoulder pain. In fact, about 70% of the elderly people over the age of 60 who visit the doctor for shoulder pain actually suffer from rotator cuff injury, which is somewhat similar to the symptoms of frozen shoulder. Rotator cuff injuries are mainly characterized by pain during shoulder abduction and supination and nighttime pain, and in severe cases, weakness in supination. If a rotator cuff injury is mistaken for “frozen shoulder” and patients with rotator cuff tears are allowed to continue to exercise such as “wall climbing” or artificially massage and loosen the shoulder joint with various techniques, it may cause the rotator cuff rupture to continue to expand and eventually form a serious or irreparable rotator cuff injury. This is the reason why many patients with frozen shoulder get worse the more they exercise. Rotator cuff injuries are more common among manual workers and teachers who often have to lift their arms, as well as older adults. About 30 percent of people over the age of 60 have rotator cuff injuries of varying degrees because the ligaments in older adults have metamorphosed and are unable to protect the rotator cuff. To distinguish rotator cuff injury from frozen shoulder, a professional physical examination is required, and a definitive diagnosis must be made by a professional orthopedic surgeon. However, you can make a general judgment. Generally speaking, frozen shoulder is characterized by limited movement of the arm and shoulder joint in all directions, with a full range of pain in the shoulder, a large pain area, and difficulty in pointing out a clear pain area. In contrast, rotator cuff injuries are more likely to be characterized by weakness, limited pain, and the painful area can be pointed out with the hand, but the range of motion of the shoulder is basically normal. In addition, frozen shoulder is usually self-healing and does not recur, but rotator cuff injury can sometimes be relieved, but it can recur.