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 patient’s organism’s reaction 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 large amounts 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, the pollen in that area may repeatedly stimulate the tribute, and the disease may reoccur. 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. Allergic rhinitis is an abnormal immune response due to a hypersensitivity reaction or called allergic reaction of the nasal mucosa to the allergens. As one of the most common allergic diseases of the respiratory tract, the etiology of allergic rhinitis is determined by a combination of environmental and genetic factors. The Lundback B study showed that the relative risk of developing allergic rhinitis in people with a family history of allergic rhinitis is two to six times higher than in people without a family history, indicating that genetic factors play a very important role in the development of allergic rhinitis. While healthy people do not develop allergic rhinitis when they are exposed to allergens, patients with allergic rhinitis have a potential tendency to develop the disease. When exposed to the allergen again, IgE binds to IgE receptors on the surface of mast cells and basophils, causing these two cells to release large amounts of inflammatory mediators and cytokines, resulting in an allergic reaction. Allergic rhinitis is only caused by contact with allergens, so if the allergen is clear, avoiding the inhalation of allergens is the key to prevention, but the allergens of allergic rhinitis are often not clear, so it is difficult to target allergens for treatment. If you have allergic rhinitis in season, you should get out of contact with flowers and reduce outdoor activities. For example, people who are allergic to pollen should avoid going to the garden or the field during the onset season; people who are allergic to house dust should wear a mask when sweeping the floor; people who are allergic to dust mites should use a vacuum cleaner to sweep the bed, etc. Families with allergies should use air filters in their bedrooms and keep windows and doors closed during the onset of the season. Allergic rhinitis comes quickly, if the allergy is lifted in time, from the allergens, the symptoms will quickly subside, so if the symptoms are serious, or frequent episodes, timely leave the original environment or transfer to recuperate, then allergic rhinitis will improve or no longer recur.