Fever is a normal defense of the body against foreign viruses or bacteria. Medically speaking, it is related to the regulation of body temperature, and if the body temperature regulates the point of rise will appear high, in clinical terms it will become a fever. In this case, it is important to actively look for the cause and at the same time, it is necessary to give the appropriate heat treatment. The most common causes of fever are bacterial or viral infections. In addition, some diseases such as immune deficiency and malignant tumors can also cause fever, as well as immune system diseases and hematologic diseases. If a fever occurs, the first thing to do is to measure the body temperature, and above 38 degrees 5 degrees, it is necessary to apply antipyretic drugs, such as physical cooling, warm water baths, or the use of antipyretic drugs, such as Sanlidone, indomethacin suppositories, etc. In addition, it is necessary to carry out symptomatic treatment according to the disease itself, and actively treat the original disease, for example, bacterial infections can be treated with symptomatic antibiotics. While reducing fever, it is important to pay attention to good living habits and diet, do not eat too much spicy and stimulating food, drink more water, more ventilation, and pay attention to good sleep. In short, when you have a fever, you must pay attention to actively improve the examination to find the cause of the disease, and at the same time choose the correct treatment plan according to the cause.