A cold in summer is different from a cold in winter and spring in terms of pathogenic factors, clinical symptoms and medication. Summer colds are often caused by the body suffering from cold and hot, excessive cold, greedy cold sleeping, eating cold drinks or getting wet, and so on, and the resistance drops, causing viruses to take advantage of it and cause upper respiratory tract infections. Traditional Chinese medicine calls cold exterior syndrome, which is divided into wind-cold, wind-heat and summer-heat dampness. Most colds in summer belong to summer heat and dampness. High fever and humidity in summer, the intersection of summer heat and humidity, and the dampness in summer heat are the characteristics of summer heat pathogen. In the hot summer season, people often suffer from both heat and cold and dampness by adopting various methods of enjoying the cool. During the clinical consultation, we found that the incidence of the disease was more than 1/3 due to long-term exposure to low-temperature air-conditioning environment or long-term direct blowing with electric fans. Forced cooling immediately in the state of extreme heat and sweat, because the body can not adapt to the rapid environmental changes, it is very easy to get sick.