If the flu has no other symptoms but fever, then you should first take physical and medication to lower the temperature, as well as consult a doctor for medical checkups. Because not all fevers are caused by colds, if there are no other symptoms of colds but only fever, it may be due to simple upper respiratory tract infections or due to the presence of inflammation in the patient’s body. Clinically, it is generally recommended to reduce the fever first. If the patient has a recurrent fever, it is necessary to improve the blood routine and other laboratory tests to determine whether there is a combination or secondary bacterial infection, if it is considered that there is a combination or secondary bacterial infection, it is necessary to comply with the doctor’s instructions and timely use of antibiotics for treatment, such as cefaclor, levofloxacin and so on. When the body temperature does not exceed 38.5 degrees, physical cooling can be the main, such as warm water baths, etc. If the patient’s body temperature has exceeded 38.5 degrees, it is necessary to take antipyretic drugs under the guidance of the doctor, such as acetaminophen. In the daily diet should also pay attention to drink more water, eat more vegetables and fruits and avoid spicy food. Daily habits include getting enough sleep and keeping your abdomen warm to prevent chills. Fever can be seen in a variety of diseases, it is recommended to promptly consult a doctor to improve the relevant laboratory tests, such as blood routine, biochemistry, lung CT, etc., to clarify the diagnosis, and comply with the doctor’s instructions for standardized treatment, so as to avoid delaying the condition.