1, bronchial asthma: is 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, if accompanied by infection, can have allergic sinusitis produced. 3, secretory otitis media: pharyngeal involvement and then edema, so that the pharyngeal mouth narrowing, obstruction, resulting in negative pressure in the tympanic chamber, middle ear exudative fluid production. 4, allergic pharyngitis: patients can also appear throat itching, cough, or mild hoarseness, serious cases can appear epiglottis, vocal cord mucous membrane edema leading to breathing difficulties. 5.Nasal polyp: Repeated nasal mucosa congestion and edema lead to the formation of nasal polyps, blocking the nasal cavity and causing 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, suffocation: nasal cavity is often blocked by a large amount of liquid, when a person falls asleep, the mouth habitually closed, will cause the body to hold the breath, which can seriously lead to suffocation.