Hot compresses out of water, which is mainly due to local heat, evaporated sweat condensation on the surface of the skin, thus showing the phenomenon of water. The patient’s skin for hot compresses, need to master the temperature, if the temperature is excessive, easy to burn the skin, if the temperature is too low, can not achieve the desired effect of the patient. Hot compresses help to improve local blood circulation, promote the patient’s metabolism, can relieve the patient’s local pain and swelling and cold and other effects. Hot compresses out of water is a normal physiological phenomenon, often hot compresses on the patient’s body is favorable, each hot compress time should not be too long, control within half an hour is appropriate. Patients usually have discomfort, timely to the hospital for examination, actively cooperate with the doctor treatment, do not be careless, so as not to delay the treatment, affecting the therapeutic effect.