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- Dictionaryhypersensitivity/ˌhʌɪpəˌsɛnsɪˈtɪvɪti/
noun
- 1. extreme physical sensitivity to particular substances or conditions: "hypersensitivity to common chemicals"
- 2. a tendency to be easily hurt, worried, or offended: "hypersensitivity to criticism"
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Hypersensitivity (also called hypersensitivity reaction or intolerance) is an abnormal physiological condition in which there is an undesirable and adverse immune response to an antigen. It is an abnormality in the immune system that causes immune diseases including allergies and autoimmunity.
Oct 14, 2021 · A hypersensitivity reaction is an extreme or unnecessary immune response that the body has to an antigen. There are four different types of hypersensitivity reactions....
Jul 24, 2022 · Biology definition: Hypersensitivity is a state of altered reactivity in which the body reacts with an exaggerated immune response to a foreign substance.
a condition in which the immune system reacts in an extreme way to a substance in the body: Acute hypersensitivity, resulting in vomiting or diarrhoea, can be a reaction to allergies to foods such as nuts or shellfish. SMART Vocabulary: related words and phrases. Poisoning and allergy. allergenic. anaphylactic shock. anaphylaxis. animatedly.
Mar 12, 2022 · Hypersensitivity is increased reactivity or increased sensitivity by the animal body to an antigen to which it has been previously exposed. The term is often used as a synonym for allergy, which describes a state of altered reactivity to an antigen.
Hypersensitivity as an immunological dysfunction is defined as exaggerated or inappropriate response of the immune system, which is mostly targeted at innocuous antigens with consequent tissue damage.
These abnormal immune system responses are called hypersensitivity reactions. Some hypersensitivity reactions are called allergies, especially when they occur after exposure to substances that are usually harmless to most people. Hypersensitivity reactions can involve the skin and cause disorders such as the following: Drug rashes.
Nov 20, 2023 · A hypersensitivity reaction (HSR) is an exaggerated and/or pathological immune response to exogenous or endogenous substances. HSRs are commonly classified into four types. Type I HSRs (e.g., food and pollen allergies, asthma, anaphylaxis) are immediate allergic reactions.
a condition in which the immune system reacts in an extreme way to a substance in the body: Acute hypersensitivity, resulting in vomiting or diarrhea, can be a reaction to allergies to foods such as nuts or shellfish. SMART Vocabulary: related words and phrases. Poisoning and allergy. allergenic. allergic. anaphylactic shock. anaphylaxis.
An allergic state in which more severe tissue reactions occur on a second or subsequent exposure to an ANTIGEN than on the first exposure. A particular group of antibodies (IgE) is involved in many hypersensitivity reactions. Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005.
