Oral allergy syndrome can cause cross reactions in people allergic to things like grass pollen and latex.
My mouth sometimes itches after I eat produce. Could I be reacting to the pesticides?
While some studies have linked the rise in food allergies to exposure to particular pesticides over time, it’s very rare to have a true allergic reaction to the pesticide residues that can remain on produce. That said, allergies are very individual, and there’s no harm in trying out certified organic produce—which is free of synthetic pesticides—to see if that does the trick.
If going organic doesn’t help, though, it is possible to be allergic to the fruits and vegetables themselves. Some people have what’s called oral allergy syndrome, meaning they get reactions to certain proteins found in various fruits and vegetables.
RELATED: Your 12 Worst Allergy Mistakes
For example, bananas, avocados, kiwis, and more can cause cross-reactions in people who are allergic to latex—an allergy you may not realize you have if you’re not, say, a health care worker or someone who wears a lot of rubber gloves. Those who have allergies to birch, ragweed, or grass pollens may react to things like hazelnut, peaches, celery, sunflower seeds, and zucchini, to name a few.
An allergist can do skin or blood tests to see which protein is causing your cross-reactions, and that can help you pinpoint foods to stay away from. Some people find that their symptoms occur only during allergy season or that they can, for example, eat apple pie without an issue but can’t bite into a fresh apple. That’s because cooking with high heat breaks down the problem proteins that cause the cross-reactions.
Itchiness may seem like a minor symptom now, but it’s very important to sleuth out your triggers with your doctor and avoid the ones that bring it on. Even if you’ve had only a mild reaction in the past, in rare cases your reactions could lead to anaphylaxis, a dangerous type of reaction that can cause a severe drop in blood pressure and constricted airways.
Health's medical editor, Roshini Rajapaksa, MD, is assistant professor of medicine at the NYU School of Medicine.
Meet Dr. Raj at the Health Total Wellness Weekend at Canyon Ranch in May 2015. For details, go to Health.com/TotalWellness.