In summer, the most common thing for respiratory medicine is fever. Fever is a symptom, not a separate disease. Many diseases can cause fever, so doctors are not as light and easy to treat fever as people say that some anti-inflammatory and antipyretic drugs will make it better. What is fever? Various thermogenic factors cause the body’s thermoregulatory center to be impaired and cause an increase in the regulatory body temperature, which generally exceeds the normal body temperature by 0.5℃ is considered fever. Therefore, there are two necessary conditions that must be met for fever to occur. One is that the regulatory body temperature rise is the result of the body’s active regulation, rather than passive. Such as heat stroke, that is, the typical passive body temperature rise, belong to overheating, not fever. Secondly, it exceeds the normal body temperature by 0.5℃. Clinically, it is mostly indicated by the body surface temperature under the axilla (normal 36.0-37.0℃), and if it exceeds 37.5℃, it is considered feverish. Common causes of summer fever: There are many diseases that cause fever, which are generally divided into two categories, infectious and non-infectious: I. Infectious fever is overwhelmingly an infectious fever. As the temperature rises in summer, pathogenic bacteria are active, and if the body’s resistance decreases, it is easy to get infected and cause fever. It is most common in upper respiratory tract infections, such as colds, bronchitis, pharyngeal conjunctival fever, etc. It can also be seen in the lower respiratory tract, such as pneumonia, tuberculosis, lung abscess, etc. It can also be seen in gastroenteritis caused by unclean food, etc. Non-infectious fever is caused by many diseases, such as blood diseases, malignant tumors, connective tissue diseases, etc. For summer, non-infectious fever is most often caused by functional disorders in the body, such as hyperthyroidism, severe water and blood loss, and sterile inflammation of tissues. Especially for surgical inpatients, absorption fever and drug fever are seen. In addition, elevated body temperature in summer is also commonly seen in overheating, such as heat stroke, and heat stroke causing pyrexia and heat exhaustion. The correct procedure for dealing with fever: 1. Fever is a protective mechanism of the body itself. Therefore, mild fever, below 38.5 ℃, generally do not need to make cooling treatment. 2. When the body temperature exceeds 38.5℃ and above, especially above 39.0℃, it is harmful to the human body and requires timely antipyretic and cooling treatment. Because, when the body temperature is too high, the enzymes of biochemical reactions occurring in the body will fail and affect the normal function of the body.3. Whether it is low fever or high fever, body fluids should be properly replenished, such as drinking a lot of water and giving fluids. The fever can be reduced by physical and pharmacological cooling, depending on the situation, and hormonal antipyretics should be used with caution. 5.