When you have a fever, you can use 40 ℃ hot water to soak your feet, usually for 15-20 minutes, can effectively relieve the symptoms of fever, and at the same time on the headache as well as colds will also have relatively obvious signs of relief. Because the feet of the blood vessels dilated, blood flow from the head to the feet, can relatively reduce the congestion of the brain, for the headache caused by fever is to help recovery. Then also can take a hot bath is also helpful to achieve the effect of fever reduction. It is best to use a water temperature that is about the same as the body temperature.