Explain why some people suffers from allergies

Let's explain why some people experience allergies.

Allergies occur when a person's immune system overreacts to a harmless substance, called an allergen, that it mistakenly identifies as a threat. Upon first exposure, the immune system produces specific IgE antibodies that attach to mast cells. Subsequent exposure to the same allergen triggers these IgE antibodies to bind to the allergen, causing the mast cells to release chemicals like histamine, which then cause the characteristic allergic symptoms such as itching, swelling, sneezing, or difficulty breathing. This hypersensitivity is often genetically predisposed.