Hypersensitivity to an allergen is due to

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(A) Hypersensitivity to an allergen is known as an allergy. It is caused by an exaggerated response of the immune system to certain antigens present i

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Aberrant function of immune system

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(A) Hypersensitivity to an allergen is known as an allergy. It is caused by an exaggerated response of the immune system to certain antigens present in the environment. These antigens are called allergens. The immune system mistakenly identifies harmless substances as threats,leading to the release of chemicals like histamine and serotonin from mast cells,which cause allergic symptoms.

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