ANATOMY

Detailed explanation-1: -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-2: -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-3: -In an allergic reaction-the immune system’s hypersensitivity reaction to usually harmless foreign substances (called antigens in this context) that enter the body-mast cells release histamine in inordinate amounts.

Detailed explanation-4: -While allergies indicate that the immune system is not functioning correctly, a group of researchers’ suggests otherwise. They argue that these allergies could be the body’s mechanism of getting rid of toxic substances and that allergies are indicators of strong immune systems.

Detailed explanation-5: -Allergic reactions (hypersensitivity reactions) are inappropriate responses of the immune system to a normally harmless substance. Usually, allergies cause sneezing, watery and itchy eyes, a runny nose, itchy skin, and rash. Some allergic reactions, called anaphylactic reactions.