When spring is in full bloom, colorful flowers compete with each other, and the fragrance of flowers floating in the wind is intoxicating, but for people with allergies, there are some discordant melodies lurking behind the colorful scenery, that is, the pollen with very tiny particles but huge quantity, floating in the air and in close contact with us at all times. Once inhaled by people with allergies, these pollens can cause bronchospasm, leading to the occurrence or recurrence of bronchial asthma, often starting with nasal itching, sneezing, runny nose, coughing, chest tightness and other symptoms, followed by rapid shortness of breath, croup in the mouth, and in severe cases, a blue face, profuse sweating, and even a drop in blood pressure and unconsciousness. The symptoms can be relieved within a few minutes to a few hours in mild cases; in severe cases, the attack can continue and must be sent to the hospital in time. Pollen-induced allergic diseases include seasonal allergic rhinitis, allergic conjunctivitis, allergic skin disease and allergic asthma. Asthma caused by pollen inhalation is called “pollen asthma”; rhinitis caused by pollen inhalation is called “pollen allergic rhinitis”. At present, the medical profession believes that allergic rhinitis and allergic asthma are different degrees and different parts of a disease. In spring, tree pollen is the main cause of pollen allergy, mostly seed trees, cypress, ash, phacelia, toon, pine, poplar, willow, elm, etc. These plants have a large amount of pollen, small size, high content in the air, and are more likely to spread on windy days. Pollen asthma is an allergic disease that manifests itself in the lower respiratory tract, starting mainly as an irritating dry cough during pollen dispersal, and manifesting itself as wheezing episodes when symptoms worsen. Because inhaled pollen must pass through the upper respiratory tract before entering the lower respiratory tract, attacks are often preceded or accompanied by significant upper respiratory allergy symptoms and other allergic symptoms, mainly nasal itching, sneezing, runny nose, nasal congestion, and itchy skin behind the ears. Since one of the most obvious symptoms of allergic asthma is shortness of breath, chest tightness, coughing, wheezing and difficulty in breathing, it is easy to misdiagnose it as heart disease. After heart disease is ruled out, a prompt visit to the respiratory department should be made, and the diagnosis can be easily confirmed by doing a bronchial excitation test to avoid detours in treatment. Therefore, if you have chest tightness or breath-holding after exposure to odors, or have allergic reactions similar to cold symptoms, remember not to take drugs indiscriminately, but go to a regular hospital for regular consultation and treatment in a timely manner, and carry out long-term planned treatment under the guidance of a doctor. Measures to avoid the occurrence of hay fever asthma include: 1. Avoid contact with allergens. People with a history of pollen allergy should go to places where flowers and trees are abundant as little as possible; if you go out on a field trip, it is best to wear a dense anti-pollen mask, and if you experience itchy skin, generalized fever, coughing and shortness of breath, you should leave the place quickly; you should wash your hands and hair in time after going home to reduce the impact of pollen. In addition, you can move for a long time or temporarily move to an area without or with less allergenic pollen during the pollen dispersal season, or live in a room with a filtration device during the pollen dispersal season. 2. Enhance physical fitness. Pollen allergy is related to allergic constitution. When the body’s immune function is normal, the symptoms of allergy can not occur or the symptoms are mild when encountering allergens, but when the body is in bad condition, such as when working hard or resting poorly, the symptoms of allergy can easily occur or be more serious when the attack occurs. 3, adhere to a healthy lifestyle. Maintain an optimistic and cheerful mood and overcome anxiety and tension. In general, patients with pollen allergy can relieve themselves after leaving the allergenic environment, or take some common anti-allergy drugs to slowly relieve themselves, but serious patients must go to the hospital for consultation and treatment. 4. Pay attention to daily diet. Patients with allergy history should try to eat less high protein, high calorie diet and less refined food, which can make the body’s ability to produce antibodies decrease, so when they encounter pollen and other antigens, they are less likely to have metamorphosis, which can reduce the occurrence of allergic asthma. 5.Regular use of medication. Asthma patients should insist on medication even when they are not having an attack, and they should follow the doctor’s advice to use appropriate medication for prevention: when going out, they need to carry salbutamol or terbutaline aerosol with them to relieve symptoms when they have an asthma attack. 6. Prevention and control of allergic rhinitis. Due to the continuity of the mucous membrane of the upper and lower respiratory tract, most asthma patients have allergic rhinitis, and spring is a good season for allergic rhinitis, therefore, once the symptoms of runny nose, sneezing and nasal congestion appear, you must not take them lightly and should go to the hospital in time. Active control of allergic rhinitis can significantly reduce the frequency of asthma attacks and reduce the symptoms of asthma.