Allergic rhinitis, also known as allergic rhinitis, is an allergic disease of the nasal mucosa and can cause a variety of complications. Allergic rhinitis is an allergic inflammation of the nasal mucosa with episodes of sneezing, runny nose, and nasal congestion mediated by immunoglobulin E (IgE) after exposure to allergens in susceptible individuals. Typical symptoms are nasal itching, continuous episodes of sneezing, profuse watery nasal discharge and nasal congestion. The specific manifestations are as follows: 1. Nasal itching and continuous sneezing: there are often several paroxysmal episodes per day, followed by nasal congestion and runny nose, especially obvious in the morning and at night. Nasal itching is seen in most patients, sometimes itching outside the nose, soft palate, face and external ear canal, etc. Seasonal rhinitis is more obvious with itchy eyes. 2, a large amount of clear water-like nasal discharge, but when the acute reaction tends to weaken or disappear, it can be reduced or thickened, if secondary infection can become mucopurulent secretions. 3.Nasal congestion: varying degrees of severity, unilateral or bilateral, intermittent or continuous, or alternating. 4.Sniffing disorder: caused by mucosal edema and nasal congestion, mostly temporary. Those caused by persistent mucosal edema leading to atrophy of olfactory nerve are mostly persistent. 【Treatment】Treatment principles include avoiding allergens as much as possible, using antihistamines and glucocorticoids correctly, and if conditions are available, specific immunotherapy is feasible. 1, avoid contact with allergens 2, drug therapy Because of the convenience of taking, the effect is clear, is the first choice of measures for the treatment of this disease. (1) Antihistamines are effective in treating nasal itching, sneezing and increased nasal discharge, but weak in relieving nasal congestion. These drugs have a satisfactory inhibitory effect on the clinical symptoms of allergic rhinitis, but they can cross the blood-brain barrier and have side effects such as sedation and drowsiness; after oral administration, patients may have mental discomfort, which affects their work; they should not be taken by vehicle drivers and staff engaged in high-risk work at height. (2) Topical glucocorticoid nasal spray: the most reliable and commonly used local anti-inflammatory drug, with anti-inflammatory and anti-edema effects, is the first-line conventional drug for the treatment of allergic rhinitis. This type of commonly used drugs include co-solvadex, endosulfan, reno-cort, etc. (3) Decongestants: mostly used for intranasal local application to treat nasal congestion, the long-term use of such drugs can cause drug rhinitis, generally should not exceed 10 days. (4) Specific immunotherapy has some effect on pollen and dust mite allergy, mainly for persistent rhinitis and/or with asthma, but should not be used during acute asthma attacks. (5) Chinese medicine and herbal medicine (6) Others: Various surgical treatments to reduce the sensitivity of nasal mucosa have certain effects, but the efficacy is maintained for a short period of time, and the indications must be strictly selected. Treatment in special cases】 1. Pediatric allergic rhinitis. Pediatric allergic rhinitis has a high incidence and a tendency to develop bronchial asthma. It occurs mostly after the age of 2 years, with 6-10 years being the high incidence age. The treatment principles are the same as for adults, but the drug doses should be adjusted appropriately. Antihistamines with sedative effects can affect the learning ability of children and should be used with caution. Intranasal glucocorticoids with very low bioavailability are generally chosen. 2. Rhinitis during pregnancy. The treatment of rhinitis during pregnancy should take into account that most drugs can pass through the placenta, so the choice of drugs should be careful. The principle is to apply intranasal glucocorticosteroids with very low bioavailability. Prevention and care of allergic rhinitis 1. Take part in regular physical exercise to increase resistance. 2.Be careful not to enter or leave the hot or cold environment abruptly. 3.If the allergen is known, try to avoid contact.