The difference between Allergy and Hypersensitivity
When used as nouns, allergy means a disorder of the immune system causing adverse reactions to substances (allergens) not harmful to most and marked by the body's production of histamines and associated with atopy, anaphylaxis, and asthma, whereas hypersensitivity means any heightened immune response to an antigen.
check bellow for the other definitions of Allergy and Hypersensitivity
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Allergy as a noun (pathology, immunology):
A disorder of the immune system causing adverse reactions to substances (allergens) not harmful to most and marked by the body's production of histamines and associated with atopy, anaphylaxis, and asthma.
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Allergy as a noun (pathology):
Any condition of hypersensitivity to a substance.
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Allergy as a noun:
Altered susceptibility to a first treatment as exhibited in reaction to a subsequent one.
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Allergy as a noun (informal):
An antipathy, as toward a person or activity.
Examples:
"He has an allergy to [[reality TV]]."
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Hypersensitivity as a noun:
Any heightened immune response to an antigen; an allergy.
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Hypersensitivity as a noun:
The state of being easily offended or hurt.