If there is a problem of femur pain, the causes are mainly considered in the following aspects: first, femur tumor, bone tumors lead to bone destruction or compression of the surrounding tissues, resulting in femur pain. Second, femur inflammation, such as bacterial infection or aseptic inflammation, can cause pain in the femur. Third, fracture, such as a fall or vigorous pressure, directly leading to the femur broken, will produce have obvious pain problems. Fourth, due to prolonged bed rest and reduced exercise, bone malnutrition produces increased local calcium loss, resulting in the femur to appear wasteful osteoporosis, will also induce pain symptoms. It is necessary to use imaging methods, such as CT for differential diagnosis and then targeted treatment.