What is hypersensitivity?

  • (noun): Pathological sensitivity.
    See also — Additional definitions below


Hypersensitivity (also called hypersensitivity reaction) refers to undesirable reactions produced by the normal immune system, including allergies and autoimmunity. These reactions may be damaging, uncomfortable, or occasionally fatal. Hypersensitivity reactions require a pre-sensitized (immune) state of the host. The four-group classification was expounded by P. H. G. Gell and Robin Coombs in 1963.

Read more about Hypersensitivity.

Some articles on hypersensitivity:

Heliophobia - Hypersensitivity
... Heliophobous plants are commonly known as "shade-tolerant". ...
Sulfonamide Hypersensitivity Syndrome
... Sulfonamide hypersensitivity syndrome is similar to anticonvulsant hypersensitivity syndrome, but the onset is often sooner in the treatment course, generally after 7-14 days of ...
Electromagnetic Hypersensitivity - Prevalence
... The prevalence of claimed electromagnetic hypersensitivity has been estimated as being between a few cases per million to 5% of the population depending on the location and definition of ... the prevalence of self-reported electromagnetic hypersensitivity within the sample group was 3% (95% CI 2.8–3.68%), with electromagnetic hypersensitivity being defined as "being allergic or ... year in Stockholm County (Sweden), found a 1.5% prevalence of self-reported electromagnetic hypersensitivity within the sample group, with electromagnetic hypersensitivity being ...
Amaxophobia - Non-psychological Conditions
... Photophobia – hypersensitivity to light causing aversion to light Phonophobia – hypersensitivity to sound causing aversion to sounds ... Osmophobia – hypersensitivity to smells causing aversion to odors ...
Hypersensitivity - Coombs and Gell Classification - Type V
... Instead of binding to cell surface components, the antibodies recognise and bind to the cell surface receptors, which either prevents the intended ligand binding with the receptor or mimics the effects of the ligand, thus impairing cell signaling ... Some clinical examples Graves' disease Myasthenia gravis The use of Type 5 is rare ...

More definitions of "hypersensitivity":

  • (noun): Extreme sensitivity.