Usually it does not cause significant pain when the bone grows after a fracture, and localized itching may occur when the bone is healing, which is a normal phenomenon. If there is localized pain after fracture, other reasons should be considered, such as unstable fracture fixation and loosening of the plaster, at which time the broken ends of the fracture will produce micro-movement, which can cause additional damage, and will cause pain. Then there is the possibility that the patient did not elevate the lower limbs after the cast fixation, the lower limbs of the blood is difficult to return to the limbs, which may cause limb swelling, can also lead to localized swelling and pain at the fracture site. Therefore, if localized acute pain occurs during the fracture healing period, it is important to go to the hospital for X-ray examination at an early stage to clarify the fracture healing situation.