Complications that can be caused by allergic rhinitis are: 1. bronchial asthma: the most common complication of allergic rhinitis, the disease of the nasal cavity leads to the failure of its viral defense function, invading the bronchi and even the abdomen. 2, allergic sinusitis: due to edema of the mucosa of the sinus opening, resulting in nasal congestion and poor drainage, and progressive negative pressure in the sinus cavity, when patients have more headaches, such as accompanied by infection, can have allergic sinusitis produced. 3, secretory otitis media: pharyngeal involvement and edema, so that the pharyngeal mouth narrowing, obstruction, resulting in negative pressure in the tympanic chamber, middle ear exudate fluid leading to the occurrence of the disease. 4, allergic pharyngitis: patients may also have throat itching, coughing, or mild hoarseness, and in severe cases, epiglottis and vocal fold mucous membrane edema leading to breathing difficulties. 5.Nasal polyp: Repeated nasal mucous membrane congestion and edema lead to the formation of nasal polyps, which obstruct the nasal cavity and cause ventilation disorders. 6.Sniffing disorder: nasal mucosa edema or nasal infection injures the olfactory nerve. 7, insomnia: long-term nasal congestion, making it more difficult to sleep, resulting in poor sleep caused by poor mental health and concentration. 8, breath-holding asphyxiation: nasal cavity is regularly blocked by a large amount of liquid, and when a person falls asleep, the mouth is habitually closed, which will cause the body to hold its breath, which can seriously lead to asphyxiation. 9, the necessary conditions for its occurrence are 3: ① specific antigen that is the substance that causes the body’s immune response. ② atopic individual that is called individual differences, allergic constitution. (3) The atopic antigen and the atopic individual meet.