You are probably reading this because you have already been to an allergist and have found out you are allergic to corn, and now you need to figure out what to do. Or perhaps you are reading this because you or someone you know suspects a corn allergy or a corn intolerance. Even if you have tested negative to an allergy test, do not abandon the idea that you may need to avoid corn. Why do I say this?
Because allergy tests are not always accurate. And the definition of a classic allergy has been pared down to mean only "the release of histamine when contact with a protein has been made." Well, what about reactions to corn syrup or corn starch? The standard answer is that you cannot be allergic to a carbohydrate. The real issue is, the immune system is very complex and not fully understood. There are chemicals the body releases other than histamine, but the medical community does not like to call them allergies.
Also, doctors do not make symptomatic diagnoses very often, and avoiding corn may be the only prescription for good health. I am of the opinion that no one would deliberately say they had this allergy if they did not (the food restrictions alone are difficult to deal with), so I believe that you should trust yourself and your body, regardless of whether your test is negative or not. There are many sufferers out there who will attest to their health improving immensely once they eliminated corn from their diets.
However, even with a positive allergy test, there is still the issue of corn being taken seriously as an allergen. Doctors' advice is simply to eliminate the corn from your diet, BUT, corn is not as simple as that! While "everyone" acknowledges that, say, peanuts and shellfish are very serious and dangerous allergies, corn is still relatively new. In my "unprofessional" opinion, I believe that in America, in about 100 years, corn will be considered as serious an allergen as peanuts. After all, 100 years ago, who ever heard of a peanut allergy? It was not until dozens of uses for peanuts and its derivatives were found that the allergy became widespread, and, unfortunately, not until many people died from a reaction that it became taken seriously by folks other than the family members of the allergy sufferers. (I sure hope that it does not take a death from a corn allergy for us to get the same serious treatment from the medical and legal community.)
As an addendum to the above paragraph, if YOUR symptoms are similar to those of anaphylactic shock, and you have tested negative, then GO TO ANOTHER DOCTOR. We don't want YOU or YOUR CHILD to be the first death!