Allergies are abnormal reactions of the immune system that occur in response to otherwise harmless substances. Heightened sensitivity to a foreign substance. The severity of an allergic reaction. Major source of lost productivity in the workplace.
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On Allergies: Is Modern Medicine Fighting the Causes of This Ailment? Are Doctors Telling Us Everything? A Case Against Allegra, Claritin, Zyrtac, and other allergy relief medicines and their makers together with distributors, prescribers, and blind consumers. By Mamurjon Rahimov, May 12/2004 Definition allergy immune system substance Allergies are abnormal reactions of the immune system that occur in response to otherwise harmless substances. An allergy is a heightened sensitivity to a foreign substance (called an allergen) which causes the bodys defense system (the immune system) to overreact when defending itself. Normally, the immune system would only react if a harmful substance, such as a bacteria, attacks the body. For people with allergies, their own immune system is working too hard, and it reacts even when relatively harmless substances such as pollen are present. The severity of an allergic reaction can vary from mild discomfort to life threatening situations. Description Allergies are among the mo