Rhinitis can not blow air conditioning mainly for the following reasons: First, the air conditioning filter contains a large number of allergic substances, most clinically seen is the dust mite. Once the air conditioner is blown, a large number of dust mites are inhaled by the patient’s nasal cavity, which can easily induce a rapid-onset allergic reaction, manifested as sneezing, runny nose, itchy nose and other related situations. Secondly, air conditioners contain a large number of viruses, bacteria and other substances. If these substances enter the nasal cavity through the air conditioning wind, it is easy to induce acute rhinitis and other infectious inflammation in the nasal cavity, resulting in nasal runny nose, even including pus nasal discharge, nasal non-ventilation and other related conditions. Thirdly, the air conditioner will lead to a temperature difference between the house and the outside temperature, especially when the temperature inside the house is lowered, and the reaction of the temperature difference to the patient’s nasal mucosa will lead to the contraction of the nasal mucosa blood vessels, resulting in nasal congestion and other related symptoms.