Another heavy snowfall has fallen. The winter in Heilongjiang Province is particularly cold and the air is dry. Many patients come to the clinic at this time to reflect that when they go out and encounter cold air, they will have stuffy nose, runny nose, sneezing and very uncomfortable. These symptoms are actually what we call “cold air allergic rhinitis”. Cold air allergic rhinitis is mainly a kind of nasal allergic reaction caused by cold air stimulation, manifested as nasal mucous membrane congestion, edema, nasal itching, throat discomfort, cough and other symptoms. The remission period can return to normal, and repeated attacks can cause proliferative changes in the mucosal epithelial layer, resulting in mucosal hypertrophy and polypoid changes. If combined with infection, it may manifest as mucopurulent or pus snot. What causes cold air allergic rhinitis? Some patients may have genetic factors, and some patients may have the basis of allergic rhinitis caused by dust mites, pollen, fungi, etc. These causes cause the patient’s nasal mucosa to be in a state of hyperreactivity, and when encountering a sudden change in environment (such as walking from a heated room to the outdoors in winter, or walking from the outdoors back to the room), the temperature and humidity change rapidly, and the sensitive nasal mucosa cannot adapt and thus symptoms appear. How to prevent and treat cold air allergy? 1. Wear a thicker mask when you go out in winter so that the air entering the nasal cavity is warmer and more moist. 2.Check allergens, exclude the influence of allergens, and treat allergic rhinitis. 3. Combine work and rest, prevent overexertion, pay attention to exercise, especially more outdoor activities. 4.Usually wash your face and nose with cold water or take a cold bath to enhance your adaptability to cold. 4.Prevent upper respiratory tract infections and colds. 5.Withdraw from alcohol, chili and other irritating foods. Be cautious with detergents, perfumes, mosquito repellents and other chemical products. 6.When symptoms recur, go to the hospital to follow medical advice, symptomatic drug treatment.