Allergic rhinitis requires three conditions to occur: firstly, there must be an allergen; secondly, there must be an allergic person; and thirdly, it can only develop when the nasal mucosa of an allergic person is exposed to a sufficient amount of allergens several times. Therefore, the occurrence of allergic rhinitis is closely related to genetics and environment. In addition, allergic rhinitis is not contagious but can be easily inherited from elders. The main clinical symptoms of allergic rhinitis are itchy nose, sneezing, runny nose and nasal congestion, often accompanied by itchy eyes and occasionally coughing and wheezing. Allergic rhinitis can be divided into seasonal rhinitis (pollen allergy is the main cause, common in the north) and perennial rhinitis (dust mite allergy is the main cause, common in the south), and allergens can be identified through skin prick or blood test. The allergic rhinitis can be treated symptomatically with medication and allergically with desensitization.