Pathologic Function
allergic reaction
al·ler·gic re·ac·tion [ uh-lur-jik ree-ak-shuhn ]
Definitions related to allergic reaction:
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(allergic response) A hypersensitive immune reaction to a substance that normally is harmless or would not cause an immune response in most people. An allergic response may cause harmful symptoms such as itching or inflammation or tissue injury.NCI Dictionary of Cancer TermsU.S. National Cancer Institute, 2021
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A hypersensitivity reaction triggered by exposure to a previously encountered foreign substance to which the individual has formed antibodies.NICHD Pediatric TerminologyU.S. National Cancer Institute, 2021
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An immune response that occurs following re-exposure to an innocuous antigen, and that requires the presence of existing antibodies against that antigen. This response involves the binding of IgE to mast cells, and may worsen with repeated exposures.NCI ThesaurusU.S. National Cancer Institute, 2021
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A disorder characterized by an adverse local or general response from exposure to an allergen.Common Terminology Criteria for Adverse EventsU.S. National Institutes of Health, 2021
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Allergic reactions (hypersensitivity reactions) are inappropriate responses of the immune system to a normally harmless substance. Usually, allergies make people sneeze; the eyes water and itch, the nose runs, the skin itches, and rashes develop.Merck & Co., Inc., 2020
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