An hypersensitivity reaction may be a hypersensitivity of the body to foreign substances. Our defence system (immune system) will sometimes distinguish between harmless substances, like foods and unsafe substances, foreign bodies or pathogens. This distinction is critical so as to combat these dangerous substances and may be rendered harmless. The system of some individuals, however, tends in AN excess to be sensitive to sure substances and additionally even partly harmless for the body substances. That is, even harmless substances like spore, square measure control for a distant body ANd trigger an immune reaction.
CAUSING
The hypersensitivity reaction inflicting substances square measure referred to as allergens. in an exceedingly initial contact with these allergens there's no aversion, however the body makes antibodies (repellents) and long lived, therefore referred to as memory cells against the matter. With a brand new contact, it thus involves AN aversion.
Approx. eighty p.c of all aversions happen within the skin or secretion membranes, as this takes place, the most contact with the hypersensitivity reaction inflicting substances.
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