After the substance to which one is allergic is identified and clarified through clinical observation or allergen testing, one should first try to avoid contact with or internal administration of the substance, and also avoid exposure to some other irritants, such as smoke, dust and strong perfumes, which can trigger or aggravate the symptoms. In particular, patients with allergies are likely to be allergic to more substances in addition to the known onset allergens. So, how do you avoid allergic reactions? If you are allergic to drugs, you should stop using all drugs suspected of causing the disease, including some drugs with similar structure to the suspected causative drug; otherwise, you are prone to drug dermatitis (an acute rash reaction caused by the systemic use of drugs (oral, injection, infusion, etc.). There are many drugs that can cause drug rash, the more common are antibiotics (penicillin and ampicillin, etc.), antipyretics and antigout drugs (anandamide, aspirin, carbamazepine, allopurinol, etc.), sedative-hypnotics (chlorpromazine, phenobarbital), sulfonamides (compound sulfamethoxazole, furazolidone, etc.) and serum products. The pathogenesis is divided into immune or non-immune, and the immune reaction includes all type I, II, III and IV metabolic reactions. Chinese medicine called: “Chinese medicine poison”). In addition, drink more water to promote drug excretion; early and adequate anti-allergy treatment. If you are allergic to food, you should try to avoid taking a high-protein diet such as fish, shrimp, crab, eggs, milk, and other factors that may trigger or aggravate the condition, such as seafood, spicy condiments, If you are allergic to indoor dust, you should try to keep your house clean and avoid or reduce the accumulation of dust in household items. You should avoid using carpets and furniture that tend to accumulate dust, and avoid filling toys with cotton and feathers. Try to remove or reduce indoor plants, and in the case of artificial flowers, care should be taken to keep them clean. Bed sheets, bedding and pillows should be washed and dried frequently. If you are allergic to mold, avoid damp rooms, such as basements, etc. Indoor dust contains a lot of mold, you can take some dust control measures. You should avoid places where mold can easily breed, such as leaf piles, near the ground end of tree trunks, shady places or places where grass is abundant. If you are allergic to pets, it is forbidden to keep pets at home or forbid pets to enter the bedroom, and often use a vacuum cleaner to remove dust. Contact with animal hair products such as carpets and fabrics should be avoided. Avoid contact with animals outdoors as well. For example, those who are allergic to horse hair should be prohibited from riding horses. If you are allergic to pollen, try to avoid contact with pollen. Closing bedroom windows can effectively prevent pollen from being brought indoors when the wind blows. Cool-drying your bed linens and bedding can be scheduled in the early morning when the pollen levels in the air are lowest. In hot and dry weather, when there is a lot of pollen in the air, doors and windows should be closed tightly and patients should stay indoors as much as possible. Wearing a mask when going out is also a good preventive measure. In conclusion, to avoid the occurrence of allergic reactions, it is crucial to avoid exposure and eliminate allergenic factors.