Physical cooling is the easiest, most effective and safe way to reduce fever in addition to medication. General fever does not exceed 38.5 ℃, preferred physical cooling methods to reduce fever. It mainly includes ice packs, cold and wet compresses and alcohol baths and other methods, the principle is that the lower than the body temperature of the material placed on the surface of the skin, through conduction and evaporation of the physical effect, so as to achieve the purpose of cooling. Physical fever generally wipe forehead and limb parts, as follows: 1, forehead: alcohol or ice in the head for wiping or ice packs, to help lower the temperature, and help prevent head congestion and lead to headaches; 2, limb parts: including palms, armpits, elbow, groin, popliteal fossa, etc., because of the above parts of the blood gathered more, ice towels or ice wet compresses can promote heat dissipation. Certain parts of the body should be contraindicated for physical cooling after fever, so as not to cause adverse reactions. Not suitable for physical cooling parts are as follows: 1, precordial area: the part of the flow of large blood vessels, can only make the skin surface cooling, will not only aggravate the fever, and the precordial area with cold can lead to reflex heart rate slowing, atrial fibrillation or ventricular fibrillation, etc.; 2, the soles of the feet: easy to cause reflex peripheral vasoconstriction affecting the heat dissipation by wiping the place, or cause a transient coronary artery contraction. In addition, the soles of the feet peripheral nerves are more developed, wipe the soles of the feet may affect the sleep; 3, the abdomen: the part is easy to cold, with cold easy to cause diarrhea, thus aggravating the symptoms of cold and fever; 4, after the occiput, the auricle: the part of the ice with cold compresses, easy to cause frostbite.