After the foot sprain to know whether there is a fracture, mainly from the following four aspects to determine: 1, swelling, fracture of the swelling is more serious, accompanied by subcutaneous petechiae, bruising. 2, pain. The pain of the fracture is more intense, and the pain increases when walking with weight or moving the limb, and the local pressure pain is more obvious when pressing the injury, and the percussion pain is significantly worse. 3. The fracture can be clearly diagnosed.