Allergy

Allergy is a condition in which the body becomes hypersensitive to a substance. It is an abnormal and a damaging immune response of the body of a hypersensitive person to chemical and physical stimuli, such as pollen, fur, a particular food, dust, a drug etc.

Allergic manifestations of major importance occur in about 10 percent of the population.

In informal expression, it may refer to an antipathy towards someone or something.