Sudden onset of allergic rhinitis is usually related to environmental factors. Sudden onset of allergic rhinitis is commonly caused by environmental factors, which may be caused by the mucous membrane of the nasal cavity coming into contact with a variety of allergens in the air, such as dust mites, house dust, fungi, animal dander, wind-borne pollen of various trees and grasses, etc. Most of the particles of these allergens are large, which can be blocked in the nose and an allergic reaction occurs in the nasal cavity. In addition, it may also be food allergens that cause patients to experience nasal symptoms, common food food allergens are peanuts, milk, eggs, mangoes and so on. And allergic rhinitis is hereditary and familial. Allergic rhinitis is often characterized by seasonal onset of symptoms, and some patients may have perennial allergic rhinitis. It is recommended that the patient should consult a doctor in time, take anti-allergy treatment measures, and actively improve the allergy-related symptoms in the nose.