Pollen allergy in children refers to the allergic phenomena such as sneezing, runny nose, itchy throat and coughing in children after contact with pollen-like substances. The causes of pollen allergy in children are mainly related to genes and exposure history. 1. Genes: the occurrence of pollen allergy is related to genes, similar to allergic diseases, and the existence of relevant susceptibility genes in children is a prerequisite for pollen allergy. 2. Exposure history: In addition to the existence of relevant susceptibility genes, children need to be exposed to pollen environment to induce pollen allergy, such as a specific kind of flower allergy, if the child has not been exposed to the pollen of this kind of flower, the allergy phenomenon will not occur. Children who are allergic to pollen should avoid contact with pollen on a daily basis and wear a mask when going out, thus reducing the incidence of pollen allergy.