The main cause of seasonal allergic rhinitis is allergy, which is related to environmental factors and allergies. The main allergens of seasonal allergy are inhalants, with pollen being the most common. Pollen is the allergen that causes seasonal allergic rhinitis, so the disease is also called hay fever. There are more obvious regional and seasonal. Mostly wind-borne flowers, its powder particles are many and small, light weight, very easy to scatter with the wind, it is measured in the ocean surface and high altitude can be collected pollen particles. Commonly, there are artemisia, ragweed, amaranth, quinoa and maple, spruce, tree, cypress, poplar, willow, sycamore and sunflower, etc., and ragweed and artemisia are the most allergenic. There are many causes of seasonal allergic rhinitis, it is recommended that patients go to the hospital in a timely manner to clarify the diagnosis, can follow the doctor’s instructions to take standardized treatment.