Pollen allergy is a typical manifestation of fast-onset allergies, and we discuss the prevention and treatment of fast-onset allergic reactions with the prevention and treatment of pollen allergy: Pollen is the male organ of the plant, which needs to unite with the pistil of the female in order to bear fruit, sow seeds and reproduce offspring. It is this even invisible, insignificant thing that causes the same problem for hundreds of millions of people worldwide every year. The pollen that causes allergies comes mainly from three main groups of plants: trees, pasture and weeds. Its diameter ranges in size from 10 μm to 100 μm. There are two types of pollen depending on the external force by which they are spread: pollinators that are spread by wind are called wind-borne pollinators, and pollinators that are spread by insects are called insect-borne pollinators. Wind-borne pollen is the main cause of allergies. Wind-borne pollen is an important source of airborne allergens, each tree produced by the flower particles can release up to several million pollen particles, airborne pollen in the existence of the time from a few hours to 4 ~ 5 days ranging from a few airborne pollen particles in the deposition of a few airborne pollen particles in the air before even can be drifted with the wind up to 14,000 meters high in the air, 200 kilometers far away from the pollen is the main pollen induced by allergies. However, the farther away from the pollen source, the less airborne it is and the lighter the triggering symptoms. Characteristics of pollen in different seasons and regions: spring pollen can be divided into early spring and late spring, early spring pollen is mainly tree pollen, Beijing every year the air fluttering poplar flakes willow flakes is the best portrayal of the spring blooming peach blossom, apricot blossom, pear blossom and its brightly colored pollen mostly belongs to the insect-borne pollen, generally does not cause allergies. Because of the vastness of China, adapted to the planting of different species of trees in different parts of the country, the city of South China to the wood Ma Huang, saffron goat’s foot and neem and other species of trees, the central and southern areas of the planting of sycamore, while the north is mainly planted in the cypress, pine, poplar, willow, elm, acacia and birch, and so on. These tree pollens have subsequently become locally important allergenic pollens. Late spring and early summer pollen is predominantly pasture, not trees. Fall pollen is primarily of the weed family, which is an important source of allergenic pollen worldwide. Artemisia pollen is the main source of allergens. Artemisia prefers dry and sandy soil areas and is most common mainly in deserts and the north. It is followed by grasses, commonly known as Larix, which are the most common weeds in northern fields. Clinical features: 1, distinct seasonality: pollen symptoms appear with the peak of pollen in the air and have extremely distinct seasonality. For example, in Beijing, those who are allergic to Artemisia pollen or grass pollen usually develop in July to October, with the most severe symptoms in August and September. The vast majority of patients complained that the onset of the disease was around the beginning of the fall, and that the disease was not cured before the National Day. 2, pollen allergy is contact with pollen after half an hour or even a shorter period of time after the emergence of symptoms. The symptoms of allergy to the five senses are mainly manifested as sneezing, even up to dozens of sneezes, clear snot constantly flowing out, nose, eyes, ears, palate itchy and intolerable. Blinking, rubbing the nose, rubbing the eyes. Triggered asthma will also be chronic cough or even wheezing. 3. There is a clear relationship between pollen allergy and age. Since pollen sensitization takes at least two years, hay fever patients gradually increase after the age of 5 or 6, and infants and young children are less allergic. Diagnosis of pollen allergy: The diagnosis of pollen allergy is relatively simple and can be made on the basis of medical history and examination. (1) History of respiratory allergy, such as allergic conjunctivitis and allergic rhinitis or asthma symptoms. (2) Strong positive reaction to pollen of interest by skin test or in vitro specific IgE test. Prevention: 1. People with a history of allergy need to take medication one or two weeks in advance People with a history of allergy should pay attention to it before the flowering season, and should not wait until the onset of the disease to start treatment. The main drug is still the second generation of antihistamines. 2, do not stay outdoors for a long time, stay outdoors as little as possible during the day, especially during the time of the day when the pollen index is high, and choose outdoor activities when the pollen index is at its lowest, mainly early in the morning, late at night, or after a rain shower. Wearing glasses reduces the chance of your eyes being affected by pollen, so take your sunglasses with you when you go out. If you go out when the pollen index is high, remember to change into clean clothes when you return, and scrub your hair with a damp towel to clear pollen particles attracted by static electricity. 5.Close windows and doors Close windows and doors during the day to prevent pollen from entering. 6, do not dry clothes outdoors Dry clothes inside the house as much as possible, do not dry clothes outdoors, otherwise clothes, sheets, bed sheets, etc. are prone to adsorption of pollen particles. Drugs: In the season of flowers, no matter how careful, allergies are sometimes unavoidable, this time to choose medication. First-generation antihistamines: the main feature of these drugs is that they can block histamine type I receptors and reduce allergic reactions, mainly used for hives, atopic dermatitis rashes, allergic rhinitis runny nose and sneezing. The representative drug is paracetamol, this drug is characterized by a rapid and reliable effect, widely used in cold and flu medicines seen on the market, the main role is to reduce the runny nose, sneezing. It is also one of the most commonly used drugs for hives and rashes of atopic dermatitis. It is inexpensive, and the only bad thing about it is that it has a drowsy effect, which makes you sleepy after taking the drug and prevents you from driving and other activities. The second generation of antihistamines: compared to the generation of anti-allergic drugs belongs to the long-acting drugs, only used once a day, the effect of anti-allergy is slightly inferior to the first generation, drowsiness side effects are less, mainly for allergic rhinitis and recurrent allergic dermatitis. The representative drugs are loratadine and cetirizine, the latter has a slightly drowsy effect, but the reaction will be different for different people, and the individual’s drowsiness effect is a bit stronger. Leukotriene antagonists are also an increasingly important class of anti-allergy drugs, mainly for blocked noses and chronic coughs. The other major category is hormones, which are mainly used for extensive or severe allergies, the most commonly used being prednisone.