In summer, the air conditioning is turned on too hard, and the temperature difference between indoor and outdoor is too large, which often causes colds, tasteless mouth, loss of appetite, etc., affecting health. It is recommended to reduce the time in the air conditioning room, the general air conditioning temperature and the outdoor temperature difference of 4 ℃ is most appropriate; “working people” back home do not rush into the air conditioning room; even open air conditioning, indoor ventilation should also be maintained at the appropriate time. Wash your hands often, most of the virus transmission is still through the hands. If a healthy person touches the place where the patient has touched, and then touches his or her nose and eyes, he or she will catch a cold. For this reason, an effective way to prevent colds is to wash your hands regularly and try to touch your eyes and nose with your hands as little as possible. Eat onion and garlic prevention, summer usually diet should be light, avoid cold and spicy food, while maintaining a good state of mind, enhance their own resistance. For people with poor constitution, you can take Chinese herbal medicines such as Dazhongye and Banlangen to prevent colds. Daily food, garlic, ginger, onion and vinegar also have the peculiar effect of preventing colds.