In the natural world, pollen is a major allergen. Whenever the spring season is in full bloom the most likely to cause pollen allergies are mostly seed trees, followed by grass pollen, such as berry, castor, groundnut, French sycamore mostly, these plant pollen large volume, high content in the air, more easily spread in the wind up days, so spring excursions caused by pollen allergies hay fever more. In our population, the incidence rate is 1%, and in endemic areas, the incidence rate is as high as 5%. The oil and polysaccharide substances contained in pollen can be digested by the secretions of the nasal mucosa after being inhaled, and subsequently more than ten kinds of antibodies are released. If such antibodies meet with the invading pollen and accumulate in large quantities, they can cause allergies. So why are there more and more allergies to pollen happening now? According to expert research, there are two main reasons: on the one hand, due to the improvement of people’s standard of living, a large amount of eggs, meat products and other high-protein, high-calorie diets are consumed in the diet, resulting in the body’s ability to produce antibodies is hyperactive, so when they encounter antigens such as pollen, they are more likely to have metamorphic reactions. On the other hand, because of atmospheric pollution, water pollution and the massive application of food additives, the human body is exposed to more antigenic substances, prompting the occurrence of allergic diseases in humans. Pollen is generally about 30-50 microns in diameter, and when they are dispersed in the air, they are easily inhaled into the respiratory tract. When people with pollen allergy inhale these pollen, they will have an allergic reaction, which is called pollen allergy. Pollen allergy mainly causes swelling and inflammation of the nasal mucosa, sneezing, nasal congestion, runny nose, watery eyes, strange itching in the nose, eyes and external ear canal, and in severe cases, bronchitis and bronchial asthma. Symptoms of skin contact pollen allergy are red spots, papules, fine scales, itching or burning sensation on the skin, mostly caused by sun exposure after skin contact with pollen in the wild. Pollen allergy restricts many activities, especially outdoor activities, and even affects work, study and rest. Patients often feel depressed, irritable, tired, hard to concentrate and have difficulty driving. If a child is allergic to pollen and does not undergo any treatment, the chance of developing asthma in the future is 23%, with medication, the chance of developing asthma is 12%, and with specific desensitization treatment is 5%. So how can pollen allergy be prevented and treated? 1. Avoid contact Pollen is a difficult allergen to avoid. It is best to live indoors during the onset season and close doors and windows to reduce the entry of outdoor allergenic pollen. Air conditioning, if available, can also serve this purpose. Do not go into the wild as much as possible. If accompanied by vegetable and fruit allergies, avoid eating those allergic plant foods. Here is a reminder to eat as little high-protein, high-calorie diet as possible and to consume less refined and processed foods. People with allergy history should go to places where flowers and trees are abundant as little as possible, and should not smell flowers and plants casually; take desensitizing drugs such as Benadryl and Xylazine with you when you go on outings, and leave the place quickly if you encounter itchy skin, generalized fever, cough and shortness of breath. 2.Application of anti-inflammatory agents If the diagnosis has been confirmed, anti-inflammatory agents should be applied before the arrival of pollen season, such as topical corticosteroid Eloson ointment, etc. Those who show symptoms of nasal allergy should apply nasal hormone or sodium cromoglycate, and those with asthma can inhale hormone or sodium cromoglycate through the mouth for prevention. 3.Symptomatic medication Patients who have already developed asthma should be treated symptomatically with some drugs. In addition to continuing to apply the above drugs, oral antihistamines should be taken to reduce nasal symptoms, and attention should be paid to choosing non-drowsy antihistamines such as keratan, and asthma attacks can be treated by oral inhalation of asthma medications such as β2 agonists, such as asthma levonorgestrel, asthma kansas, salbutamol and cortisone (β2 agonist and ipratropium bromide). Serious cases need to be hospitalized. 4, the application of physical blockers: is a highly refined long-chain hydrocarbons, coated in the nasal cavity to form a protective film, equivalent to an “invisible mask” can effectively isolate pollen, dust mites, animal hair, etc., greatly improving the cure rate of allergic rhinitis, asthma and other allergic diseases! 5.Immunotherapy As mentioned above, wind-borne pollen is very difficult to avoid completely. Therefore, immunotherapy (generally known as desensitization therapy) has become the main means of prevention of hay fever. The principle of immunotherapy is to inject the patient’s sensitive pollen extract into the patient’s body in increasing doses from less to more (immunotherapy is most commonly used, and the better effect is the subcutaneous injection method), so that the patient’s body produces immunological changes, which helps to improve the patient’s immunity to the pollen. Observations from home and abroad over the years have confirmed that if the allergens are of high quality, properly applied, the case is properly selected and the method is correct, the results are quite good. How long does immunotherapy actually apply? There is no definite conclusion, but it is generally advocated that effective cases should be adhered to for 3 to 5 years. Patients with pollen with vegetable or fruit allergy, although food-induced symptoms cannot be treated with immunotherapy, due to cross-reactivity between pollen and vegetables or fruits. After 1 year of immunotherapy with the pollen to which they are sensitive, not only do the hay fever symptoms improve, but a significant number of patients are able to eat the foods to which they were previously allergic.