Allergies, known in academic circles as allergic reactions. It has a high incidence and can occur at all ages, from newborn to middle-aged and elderly, without a clear gender predisposition, but with a clear genetic predisposition. Allergy is a chronic and systemic disease. From a certain period of time, it may appear that the disease develops in one organ or mainly in one organ, but in general, it seems that the natural course of allergy starts from the development of one organ and gradually spreads to several organs, and from allergy to a few allergens, it gradually develops into allergy to many allergens. Therefore, please do a good job of prevention and treatment in all aspects: 1. There are many types of pollen floating in autumn, so after clarifying which pollen you are allergic to, you can try to avoid it according to the pollen dispersal period, such as reducing going out, wearing a mask, and not going to the suburbs or parks where pollen is concentrated. 2. Receive regular treatment. Allergic diseases are chronic and difficult to treat, and treatment requires a personalized, comprehensive and complete plan and a long period of time. Specific immunotherapy against specific allergens is the only way to change the underlying mechanism and treat the root cause and interfere with the natural course of the disease. Formal atopic immunotherapy not only treats existing allergic diseases, but also aims at long-term prevention of the development of new allergic diseases and their severe progression. Planned medication to control symptoms is also essential. 3. Carry palliative medication with you. Allergy attacks are unpredictable and can be severe or even life-threatening. Carrying relief medication and informing people around you of your condition can help you to avoid danger. 4. Preventive medication. If the allergen has been identified, but will not be able to avoid, you can take medication in advance, so that when encountering the allergen, the concentration of drugs in the blood is sufficient to resist the allergic reaction of the body.