The symptom of weakness after blowing air conditioner often occurs in hot summer when people sweat a lot and stay in the room with the air conditioner temperature set very low for a long time. According to Chinese medicine, this is a symptom of feeling wind-cold evil qi, similar to the symptoms that occur after freezing in winter with too little clothing. The Yellow Emperor’s Classic of Internal Medicine says that “the wind enters from the outside and makes people feel cold”. After the infection of cold, the Yang Qi of the body will be stagnant, and the symptoms will be heavy and weak, cold, fever, body aches and pains, clear nose and so on. If the symptoms are mild, you can drink ginger and brown sugar water, cover the sweat after drinking, and the symptoms can be relieved after sweating.