Discomfort in the nose caused by opening the air conditioner is usually a symptom caused by an acute attack of allergic rhinitis, and the allergic principle of allergic rhinitis is the direct stimulation of cold and warm air from the air conditioner, because the air conditioner will breed bacteria inside after being open for a long time, and the direct stimulation of cold and warm air to the nasal cavity will lead to a decrease in the contraction as well as the diastolic function of the turbinates of the nasal cavity, causing an increase in the permeability of the glandular cells as well as the cup cells, resulting in the patient Itchy nose, sneezing and clear watery nose are the symptoms. Patients need to avoid this direct irritation, i.e. wearing a mask and not blowing directly on the air conditioner, and taking oral anti-allergy medications such as Xithromax or loratadine, as well as using topical topical nasal applications such as coleus or azelaic acid nasal aerosol. Most fundamentally, the patient also needs to exercise to improve immunity and resistance, which can be cured in about a month by running and swimming.