Allergic rhinitis is not caused by low immunity, but is mainly related to inhalant allergens, edible allergens and other factors. 1. Inhalant allergens: such as house dust, dust mites, fungi, and various types of wind-borne pollen, after inhalation into the nasal cavity, an allergic reaction can occur in the nasal cavity, which in turn causes allergic rhinitis. 2. Food allergens: common food allergens include fish, peanuts, mango, eggs, etc. After consuming these allergens, some people may not only experience skin and digestive allergic reactions, but also cause allergic rhinitis. Allergic rhinitis is also related to genetic and environmental factors, and is not directly related to low immunity, but low immunity is prone to induce similar symptoms, the specific cause of the disease should be clarified after the relevant examinations.