The case of air conditioning blowing more is relatively easy to cough, mainly caused by infectious factors and non-infectious factors. In the air conditioning environment is a closed environment, the air does not circulate, there is a lot of dust and insect mites in the air, which will then flow back through the air conditioning into the human airways, especially for people with allergies, easily induced allergic rhinitis, and bronchial asthma attacks, and lead to the symptoms of having a cough and wheezing. In addition, because of the air holes in the air conditioner, pathogenic microorganisms, including viruses, bacteria, mycoplasma, chlamydia, and legionella, can be inhaled into the human airway and cause bronchitis and even pneumonia, resulting in coughing.