Allergic rhinitis belongs to type I rapid allergic reaction, when allergens enter the body, the body will produce the corresponding immunoglobulin antibodies and attach to the surface of the mediator cells, resulting in the release of more mediators, such as histamine, and this mediator can cause capillary dilation, increased vascular permeability, and increased secretion of glands in the nasal cavity, resulting in repeated sneezing and a large amount of clear water-like nasal discharge. The first step in treatment is to isolate the allergen, and antihistamines can be used to relieve the symptoms, such as loratadine capsules. Auxiliary saline rinsing of the nasal cavity is conducive to the outflow of nasal secretions and can also promote the recovery of the nasal mucosa function.