Allergic reaction
*The article was translated into English using automatic translation. The editors are working on its improvement.
Allergic reaction ( allergy, hypersensitivity reaction) (ancient Greek ἄλλος - other, other, foreign + ἔργον - impact) - the response of the immune system to usually harmless substances or a typical immunopathological process, expressed by the hypersensitivity of the body's immune system upon repeated exposure to an allergen previously an organism sensitized by this allergen.
Symptoms: pain in the eyes, swelling, runny nose, hives, sneezing, coughing, etc.
Typically, the immune system, which includes antibodies, white blood cells, mast cells, complement proteins and other substances, protects the body from foreign substances (called antigens). In susceptible people, the immune system may overreact to certain substances (allergens) in the environment, food, or medications that are harmless to most people. The result is an allergic reaction. Some people are allergic to only one substance. Others may be allergic to multiple substances. In the United States, about a third of the population has allergies.
