After a fracture, the fractured end bleeds, and the bleeding process can cause fever in this area, as well as in the following days, when the bruises are slowly absorbed. Redness, swelling, pain, and fever can also occur if the fracture is treated surgically, or if there is no surgical treatment but there is an open wound and there is an infection. Even if the fracture has recovered from the internal fixation surgery, but later the functional rehabilitation exercise has just started and there are muscle contractions, fever can occur at the fracture site, but this fever is not significantly painful. The fever cannot determine what kind of problem there is, but needs to be judged according to the treatment process of the disease and the recovery of the disease.