If a sprain occurs in the foot and the pain still occurs three months later, it may be due to improper treatment after the sprain, and the functional exercises are not done well, or the rest time is too short, and then the sprain causes pain more than three months later, which is called old injury. Once the foot and ankle area is strained or undergoes high intensity exercise, the local soft tissues will be stretched and pain will be induced. If this happens, it is best for the patient to go to the hospital in a timely manner to check what causes it and then choose the appropriate treatment measures to treat it.