The reasons for blowing the air conditioner easy to catch a cold may be too big a temperature difference between indoor and outdoor, there are bacteria in the air conditioner and so on. 1. The temperature difference between indoor and outdoor is too big: when you suddenly enter indoor from outdoor in hot summer, your pores are still in the open state, and your body will easily catch a cold and catch a cold at this time, with symptoms such as sneezing, runny nose, fever, and fatigue. Therefore, the air conditioner should not blow directly, and should not set the temperature too low. 2. Bacteria in the air conditioner: long time without cleaning the air conditioning, air conditioning wind parts have some dust and even bacteria breeding, air conditioning wind toward the face, it is easy to cause upper respiratory tract infections, can cause cold symptoms. Air conditioning should be cleaned regularly, wear long-sleeved clothes or special air conditioning clothing in the air conditioning room to prevent blowing the air conditioning and catching a cold. In addition, to prevent colds, we should pay attention to drink plenty of warm water, ensure adequate sleep, and avoid too much tension and anxiety.