An exaggerated response by the immune system to a drug or other substance.However, a severe reaction called anaphylaxis is life-threatening. Although allergies can make you feel bad, they usually won't kill you. In most allergic reactions, however, it is responding to a false alarm.allergies can cause a runny nose, sneezing, itching, rashes, swelling or asthma. Normally, your immune system fights germs. How do you get allergies? scientists think both genes and the environment have something to do with it. Substances that often cause reactions are People who have allergies often are sensitive to more than one thing. An allergy is a reaction of your immune system to something that does not bother most other people.Altered reactivity to an antigen, which can result in pathologic reactions upon subsequent exposure to that particular antigen. A local or general reaction of an organism following contact with a specific allergen to which it has been previously exposed and to which it has become sensitized.A disorder characterized by an adverse local or general response from exposure to an allergen.food protein-induced enteropathy ( K52.22).food protein-induced enterocolitis syndrome ( K52.21).allergic gastroenteritis and colitis ( K52.29).specified types of allergic reaction such as:.
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