Frozen shoulder, also known as frozen shoulder or fifty shoulder, is a common inflammation of the joint capsule adhesions that causes stiffness and limited movement of the joint, usually without severe pain if you maintain your original posture. Frozen shoulder is usually formed unintentionally. Sometimes you may feel discomfort in your shoulder, so you seldom move around, hoping to give your shoulder a good rest, for example, after a badminton match at the weekend, you feel very tired in your shoulder. There is nothing wrong with this, but if your shoulder is injured or you have some kind of chronic pain and you still don’t move it, your shoulder joint will become stiff and it will become difficult and painful to move it. Once this happens, it is difficult to move your shoulder even if you want to, and the slightest movement is painful. Usually, frozen shoulder is caused by trauma or tendonitis, bursitis, or a stroke. Often, it is difficult to determine the cause, but anything that can cause limited movement of the arm or shoulder joint can develop into frozen shoulder. Diabetes can also cause frozen shoulder, although the exact mechanism has yet to be studied. In diabetic patients, elevated blood glucose leads to abnormal deposition of glucose-collagen conjugates in the shoulder cartilage and tendon sheaths, causing stiffness and limited movement of the shoulder joint.