Fever is one of the common clinical symptoms, which can be caused by a variety of diseases, and is divided into three phases: the period of rising temperature, the period of persistent high fever and the period of fever reduction. The main manifestation of the period of rising temperature is generalized shivering, cold hands and feet. In this stage, we should keep warm to prevent chills, and if there is thirst, we should replenish water in time. Physical cooling should be avoided during this period, such as warm water wiping, lying on ice pillows, etc., so as not to stimulate the body and make the condition more serious. In this stage, the main focus is to keep warm, and the patient can increase the clothing and blankets until the patient feels comfortable. The main clinical manifestations of persistent high fever are generalized warmth, rapid respiration and heartbeat, headache, fatigue, etc. During this period, patients should pay attention to water and nutritional supplementation, and can be given antipyretic drugs or physical cooling according to the specific conditions. It is recommended that after taking fever-reducing medication, if the body temperature does not decrease significantly, physical cooling methods can be adopted, such as ice packs, warm water baths, etc., in order to reduce the patient’s discomfort. The main manifestation of the fever period is sweating, body temperature reduction, the body surface of fever patients will dissipate heat through sweating, should be timely dry sweat, wearing loose clothing, avoid covering heat, so as not to facilitate the recovery of the disease. If the fever does not go down, you should consult a doctor to find out the cause of the fever, and then use medication to treat it.