It's hot, why do you catch a cold when the air conditioner is always on indoors?

1. The room has been in a semi-closed state for a long time, although it has air conditioning and ventilation. But air convection still can't keep up. Thereby causing various respiratory diseases and even colds.

2. The human body needs to sweat and excrete metabolic waste in the body. Don't sweat at constant temperature, which may cause toxins in pores to be excreted! It leads to imbalance of bacteria in the body, decreased immunity and various diseases.

3. The temperature difference between indoor and outdoor is too big, and it is the easiest to catch a cold when it is cold and hot!