Fracture of the neck of the femur always feel cold buttocks may be due to poor local blood circulation, ischemic necrosis of the femoral head and other reasons, the specific circumstances of the proposal to go to the hospital to find out the cause of the disease, and then according to the cause of the targeted treatment. 1. Poor local blood circulation: It is mainly due to the stasis caused by the compression of blood vessels and nerves after the fracture of neck of femur and poor blood circulation. The lack of blood in the buttocks causes the temperature to drop, resulting in a very cold feeling. It is recommended to apply hot towel to the hip to promote blood circulation. 2. Ischemic necrosis of femoral head: It is mainly because the blood can’t run after the fracture of femoral neck and stagnate in femoral bone, so that the blood supply to the hip on the affected side is reduced, resulting in the performance of cooler temperature. Femoral neck fracture always feel buttocks very cold may have other causes, should promptly consult a doctor, according to the doctor’s instructions for examination and treatment, so as not to delay the best period of time to treat the condition.