Allergic rhinitis is an allergic reaction that occurs in the upper respiratory tract when the body is re-exposed to a substance after it has been sensitized. Patients with allergic rhinitis should take early desensitization treatment to cure allergies, otherwise repeated attacks will produce serious complications. Common complications are the following: 1, allergic sinusitis: because the sinus mucosa and nasal cavity continuous, and the same tissue structure, nasal allergic reactions can easily spread to the sinuses, due to the sinus mucosa edema, resulting in nasal congestion and poor drainage, and the sinus cavity gradually generated negative pressure, the patient has a headache, if accompanied by infection, there can be allergic sinusitis. 2, bronchial asthma: a common complication of allergic rhinitis, because all for the respiratory tract metaplasia. The World Health Organization has announced in 2005 that allergic rhinitis and asthma should be treated as the same disease, the former being an early symptom of the latter. 3. Secretory otitis media: The main pathways of this disease are: nasal allergic reactions to the middle ear cavity via the eustachian tube; allergens entering the eustachian tube via the pharyngeal tube; pharyngeal involvement and consequent edema, resulting in narrowing and obstruction of the pharyngeal opening, causing negative pressure in the tympanic chamber and exudative fluid production in the middle ear. 4. Allergic pharyngitis: Patients may have itchy throat, cough, or mild hoarseness, and in severe cases, vocal fold mucosal edema leading to breathing difficulties.