Wuhan City, after the baptism of rainstorm, is about to enter the high temperature weather, most people will choose to use air conditioning to avoid the heat. While air conditioners bring people a cool environment, they also bring some health risks due to improper use. In recent years, the number of patients with upper respiratory tract infections caused by low air conditioning temperature has increased significantly. Upper respiratory tract infection is an acute inflammation of the nasal cavity, pharynx or larynx. The human upper respiratory tract is inhabited by pathogens, but under normal conditions the respiratory tract has certain defenses and these pathogens do not invade and cause symptoms. In case of cold, some defense mechanisms of the respiratory tract become impaired, resistance decreases, and pathogens invade, leading to upper respiratory tract infection. The disease starts rapidly and the main symptoms are dryness, itching, pain in the throat, nasal congestion, runny nose, sneezing, a few patients may have fever, fatigue, and hoarseness when there is laryngitis. At this time, patients should pay attention to rest, drink more water, with appropriate cold medicine treatment can be more than 3-5 days to recover, if the secondary bacterial infection, involving the lower respiratory tract to appear obvious cough cough yellow sputum symptoms should be promptly to the hospital, under the guidance of the doctor reasonable and safe use of antibiotic treatment. The key to preventing upper respiratory tract infections is to avoid getting cold, to avoid inhaling harmful gases or particles, to strengthen the body’s resistance, and to use appropriate drugs to regulate respiratory immunity in patients with poor respiratory resistance prone to recurrent infections. Citizens should not use air conditioning to cool the temperature adjustment is too low, indoor and outdoor temperature difference is too large when the body is difficult to adapt to, easy to get sick, especially asthma and allergic rhinitis patients, too cold air stimulation can lead to the onset of disease. General daytime activity temperature 24-26 ℃ is appropriate, sleep at night to about 28 ℃ is appropriate, and do not blow the cold wind directly to the person. The elderly and infirm should be especially careful not to set the air conditioning temperature too low. The room should be frequently ventilated, before and during the use of air conditioning regularly clean the air conditioning filter and heat sink (you can ask the manufacturer to help) to reduce the presence of foreign sources of infection is also very important.