Some joints are very mobile, such as the shoulder and knee joints, while others are very mobile and barely move, such as the symphysis pubis joint in the front of the pelvis and the long bone shoulder joint in the back. Joint pain can be caused by an injury, such as a car accident, a ball game injury, a fall, or a chronic condition such as repetitive overuse of a joint. The body has a natural and complete repair response to an injury, and there is a time frame for repair, about two months for bone injuries and one month for ligament injuries. In acute injuries, bones, ligaments and muscles will bleed and blood will accumulate, causing pressure on the adjacent tissues, resulting in swelling and pain, at this time, cold compresses and fixation should be applied, and the injured part should be elevated to reduce bleeding and pain. Elevate the affected part, generally should be higher than the height of the heart; ice packs are generally applied for 20 minutes, half an hour between ice packs, and then ice packs again; rest should be made to fix the joints or reduce activities. The first three days of injury use ice; three days later change to hot compresses. Therefore, the recipe should be changed to: “elevation, rest, and hot compress”. Elevation and rest should be continued all the time. When will the swelling go down? Depending on the severity of the injury damage to decide, mentioned before the repair period, the bone about two months, ligament a month, and so on the repair is complete, can see significant swelling. After the acute injury, by the orthopedic professional treatment, and confirmed that the joint has returned to the original relevant position, do not need to accept further surgical treatment, then rest at ease, let the body itself to repair it. The dissipation and absorption of the hematoma is naturally a complex biochemical reaction and enzymatic activity of the body, which will naturally cause local irritation, a little discomfort, and slight swelling and darkening of the skin, which is a normal reaction. When the repair of the bones and ligaments is completed, it naturally enters the rehab period. The repair of an injured tissue is completed at the early stage, and its structural composition is different from the original tissue, which is harder, more fragile, and less flexible. This rehabilitation period, depending on the degree of injury, the active degree of rehabilitation, there are long and short, each person is different, generally about 1 to 3 months.