Hay-Fever-Allergy.com
About Hay-Fever-Allergy.com
An allergy is a heightened sensitivity to a foreign substance, which causes the body's immune system to overreact. Allergies can be caused by just about any substance that you breathe, swallow, or touch. When a person is exposed to a normally harmless substance, and the immune system reacts as if the substance were harmful, an allergic reaction occurs. The immune system generally responds to this reaction by releasing antibodies.
