It's very simple, because now everyone turns on the air conditioner in summer and the heating in winter, and the feeling of the four seasons is becoming more and more unclear. When sweating in summer, because of air conditioning, sweat can't volatilize and accumulate in the body; Turn on the heating in winter, wear a light coat and sweat, and the sun is shining outside, so you can't hide the essence. The human body is most likely to get sick in this state of being warm and cold at first. The skin's opening and closing function declines, and its ability to resist diseases and pathogens is getting worse and worse, which easily leads to the accumulation of dampness and pathogens in the body, resulting in yang deficiency. Damp pathogen is more harmful to human body than cold pathogen. Please pay attention to the health care in the Hall of Supreme Harmony when you are free.