Allergic rhinitis is caused by allergic reactions in atopic individuals after contact with allergens. Common allergens include inhalant allergens and food allergens, and common symptoms may include nasal congestion, runny nose, sneezing and so on. 1. Inhalant allergens: allergic rhinitis is induced by contact with hair powder, dust mites, willow floss, dander, hair, urine and other excretions of animals such as cats, dogs and rabbits. 2. Food allergens: eating milk, eggs, beef, cashews, pineapple, mango milk, peanuts, soybeans, etc., is also a cause of allergic rhinitis. Allergic rhinitis patients are recommended to actively seek medical attention, clear allergic substances to avoid contact with allergens as much as possible, and standardized treatment under the guidance of physicians.