Allergic rhinitis, medically known as allergic rhinitis, is highly variable, depending on the length of exposure to the allergen, the amount of exposure, and the response of the patient’s organism at the time. The disease can be mild or severe, the attack time can be long or short, and the onset can be urgent or slow. Allergic rhinitis can be divided into two types due to the different timing of the attacks. The first is seasonal rhinitis, which is mainly caused by pollen, so it is also called hay fever. One of the main features of this disease is that the onset of seasonality, every spring or autumn when the flowers bloom, pollen dispersal season will begin to develop. Itching in the eyes, conjunctival congestion and, in severe cases, bulbar conjunctival edema, are often mistaken for acute conjunctival inflammation; at the same time, itching in the nose also causes continuous sneezing, accompanied by severe nasal congestion and a large amount of clear nasal discharge. The symptoms appear very quickly and can last for hours, days or weeks. When the flowering season is over, the symptoms naturally resolve. The first year, it may be mistaken for a cold or flu. But the next year, at the same time of the season, the symptoms of cold start to appear again, and then you realize that it is caused by pollen. Another characteristic of seasonal allergic rhinitis is that the onset of the disease is regional, as flower farming varies from region to region, so allergies also vary. Some patients who move to another area with different climatic conditions may not develop the disease because of the difference in plant species, but after a few years, they may be repeatedly stimulated by the pollen in the area and develop the disease again. The second type is perennial allergic rhinitis. This type of rhinitis is mainly caused by year-round exposure to certain allergens, such as indoor dust, feather dander, mold and bacteria, so it develops year-round and is not seasonal. Symptoms such as oedema and itching of the eyes are not serious or even absent. The main symptoms are sneezing, nasal congestion and runny nose. Perennial allergic rhinitis, often coexists with other allergic diseases, such as bronchial asthma and ischialgia.