What is an allergy
What is an allergy and how do we get it? The word allergy comes from the Greek words: allos, which means “other” and ergon, which means “work”. A simple definition of allergy is “reaction to a harmless substance”. ... For some reason the immune system sometimes reacts to harmless invaders, resulting in an illness we call an allergy. ... If both parents have allergies a child has nearly a 75 percent chance of having a food allergy.