If a fracture requires surgical treatment, painful sensations are bound to exist after surgery. However, the pain is significantly reduced about 3 days after surgery because the fracture surgery requires repositioning and internal fixation of the fracture site to align the fracture end and restore the normal anatomical structure. If the fracture site is not active, no local nerves are stimulated to produce pain. Early pain after fracture surgery is usually due to injury caused by the surgery, or an inflammatory response in the tissues surrounding the incision site that will cause significant pain. After 3 days the bleeding stops, the damaged tissue begins to repair, the broken end of the fracture is well aligned, and there is no significant pain without activity. In some cases, the pain may last longer, for example, the physical condition is not particularly good, the nutrition is not sufficient, which leads to increased local exudation, the inflammation cannot dissipate, which leads to prolonged pain, and the fracture surgery must be followed by resting and avoiding activities.