How is allergic rhinitis caused?

Hereditary allergic constitution. Not everyone will suffer from allergic rhinitis, which usually happens to people with allergic constitution. Allergy is related to genes, and it is generally caused by heredity. Most patients with allergic rhinitis have a family history of allergies, but in recent years, due to the acceleration of industrialization and the intensification of air pollution, some people who were not allergic have also evolved into allergic constitutions. Contact with allergens. The main allergens at home are dust mites, molds, pets and insects. There are many dust mites and their excrement on bedding and underwear that are in close contact with human body; Indoor mold is easy to grow in humid, warm and poorly ventilated environment; All kinds of insects, including crickets, flies, moths, especially cockroaches, are allergens. Outdoor allergens may exist in spring, summer, autumn and winter. Include camphor, walnut, hazelnut, juniper, poplar, birch and oak.