Allergic rhinitis, also known as allergic rhinitis. Allergic rhinitis is an allergic disease that occurs in the nasal mucosa and can be divided into perennial allergic rhinitis and seasonal allergic rhinitis. Allergic rhinitis is an inflammatory change in the mucous membrane of the nasal cavity caused by an allergen in an atopic person, with nasal itching, paroxysmal sneezing, runny nose and nasal blockage as the main clinical manifestations. Any substance that causes allergy is the cause of an attack of allergic rhinitis. The development of allergic rhinitis is closely related to genetics and environment. Perennial allergic rhinitis can develop in any season of the year, while seasonal allergic rhinitis basically develops in a fixed season each year, with the onset of flowering season in spring and autumn being the most common. There are many allergens that cause allergic rhinitis, both inhalant allergens and ingestive allergens. For perennial allergic rhinitis, house dust and dust mites are the most common allergens; for seasonal allergic rhinitis, tree pollen and grass pollen are the most common allergens. Often, allergic rhinitis, on the other hand, is allergic to a variety of substances, both inhaled substances and ingested substances. If you cannot know the allergen, it is recommended to go to otorhinolaryngology or allergology to find the allergen causing allergens, and after clarifying the allergen, try to avoid contact to reduce the possibility of allergic rhinitis attack. The chance of an allergic rhinitis attack will also be reduced by strengthening exercise and improving the immunity of the body.