The difference between Allergy and Intolerance
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 intolerance means the state of being intolerant.
check bellow for the other definitions of Allergy and Intolerance
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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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Intolerance as a noun (uncountable):
The state of being intolerant.
Examples:
"'Intolerance as a state policy must not be tolerated."
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Intolerance as a noun (countable):
An intolerant word or action.
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Intolerance as a noun (countable, medicine):
Extreme sensitivity to a food or drug; allergy.