If the ambient temperature is high, you can turn on the fan to promote air circulation and reduce the ambient temperature, which is conducive to fever reduction. However, it is not recommended that patients blow directly into the fan. Fever is the body temperature is higher than the normal range, during the fever, if you feel that your body is hot, you can turn on the fan to make indoor and outdoor air circulation, but the fan should not be blown against the patient, so as not to cause the patient to get cold again, leading to fever aggravation. Fever is a symptom that can be caused by many reasons, such as viral colds, mumps, enteritis, leukemia, malignant tumors and so on. It is not recommended that the patient blindly treatment, need to clarify the cause of the disease, and then for the cause of the treatment, it is recommended that the patient to the hospital in time to seek medical treatment.