When the immune system, the body's natural defense, overreacts to something in the environment, allergies arise. An

Allergies develop when the immune system, the body's natural defense, overreacts to anything in the environment. An

When the immune system, the body's natural defense, overreacts to something in the environment, allergies arise. An

Allergies develop when the immune system, the body's natural defense, overreacts to anything in the environment. An