ANATOMY

Detailed explanation-1: -When a harmless substance such as dust, mold, or pollen is encountered by a person who is allergic to that substance, the immune system may over react by producing antibodies that “attack” the allergen. The can cause wheezing, itching, runny nose, watery or itchy eyes, and other symptoms.

Detailed explanation-2: -An allergy starts when your immune system mistakes a normally harmless substance for a dangerous invader. The immune system then produces antibodies that remain on the alert for that particular allergen.

Detailed explanation-3: -Allergy is an immune-related disease and results from a hypersensitive immune response to harmless substances in the environment.

Detailed explanation-4: -An allergy is a peculiar reaction to a substance that is not harmful to normal, non-allergic people.