The sudden appearance of allergic rhinitis is mainly caused by the exposure of the nasal mucosa to various allergens in the air, including dust, pollen, willow and so on. Allergic rhinitis is a kind of allergic disease of the nasal mucosa, which causes nasal congestion, nasal itching, paroxysmal sneezing, runny nose and other related allergic symptoms, and some patients may also have itchy eyes, watery eyes and other eye allergy symptoms. Patients with allergic rhinitis often have seasonal episodes of symptoms, and some patients may have perennial allergic rhinitis, requiring anti-allergy treatment to actively improve allergy-related symptoms in the nose.