Always have fever after internal fixation of fracture consider post fracture absorption fever, infection and so on. Absorption fever after fracture, after fracture can cause intramedullary hemorrhage of fracture site or bleeding of soft tissues as well as damage to the surrounding soft tissues, when the fracture is fixed internally, the local blood is absorbed through the body, and the damaged tissues are self-repairing, all of which can produce endogenous heat, which belongs to the normal body’s defense reaction. This fever will not exceed 38 ℃, repeated fever for about 1 week can return to normal. Infection, if the body temperature after internal fixation of body fracture is persistently higher than 38 ℃ and lasts for a long time, consider that there is an infection. Infection of soft tissue, local skin temperature, redness, swelling and pain, there may be pus. Acute osteomyelitis with deep pain accompanied by high fever, usually around 40°. Fever after internal fixation of fracture, it is recommended to actively seek medical advice and treatment under the guidance of a physician.