In summer, colds are often caused by cold and heat, excessive cold, craving for cold sleep, eating cold drinks or getting wet, etc., and the resistance drops, which makes the virus take advantage of it and causes upper respiratory tract infection. In hot summer, people often adopt various cooling methods, which make people suffer from both hot and cold and wet and cold. The purpose of drinking more water is to relieve cough from time to time and dilute the sticky phlegm that is difficult to cough up. Doctors advise people to choose Radix Isatidis, Folium Isatidis, Flos Chrysanthemi Indici and Flos Lonicerae, put them together in a cup, and brew them with boiling water instead of drinking tea, which has a good effect on preventing influenza, epidemic encephalitis and epidemic respiratory infection. This kind of tea can kill the bacteria in the throat, eliminate the itching in the throat and solve the dry cough caused by a cold. Orange juice is rich in vitamin C, which can effectively prevent upper respiratory diseases such as colds. The role of vitamin C is to enhance human immunity and reduce the duration and incidence of viral upper respiratory tract infections such as colds. You can buy vitamin C granules from the pharmacy and take them three times a day to help treat upper respiratory tract infections. Honey cough syrup: Mash a garlic, add 3 teaspoons of honey, mix with hot water, filter the minced garlic with gauze, and get the honey juice with garlic flavor. Honey has a very strong sputum scraping effect, which will promote the smooth discharge of impurities in the respiratory tract from the mouth and avoid the symptoms that holding your breath is not conducive to expectoration. Emergency strategy: avoid crowded places and drink plenty of water. In a dry air environment, the throat is prone to tightness, inflammation and dry cough. If the indoor humidity is too low, you can put a pot of water, add a few drops of essence to make the room fresh, or simply buy a humidifier to increase the humidity. One is to moisten the air and make the breath moist; Secondly, certain inhalants, such as dust, pollen, fungi, animal dander, etc., are no longer suspended and stimulate the respiratory tract.