After sidestepping symptoms for years, the sneezing and runny nose can come for you. Here’s why.
After decades of never experiencing seasonal allergies, you suddenly find yourself sneezing and sniffling along with the tens of millions of Americans who suffer from them. What happened?
“People tend to think of allergies as a childhood thing” and not something they can get later in life, said Dr. Tolly Epstein, an adjunct assistant professor at the University of Cincinnati College of Medicine who researches allergies and immunology. But “it’s very common to develop new allergies,” especially in your 20s, 30s and 40s, she said. And the symptoms aren’t always obvious.
Most people with seasonal allergies will have sneezing, itchy eyes or nasal congestion. But those can also be accompanied by fatigue, a headache or sinus pressure — which, if you’ve never faced allergies before, you might mistake as cold symptoms, Dr. Epstein said.
If you’ve recently developed a pollen allergy, you might also experience itching in your mouth after eating certain raw fruits and vegetables, said Dr. Andrew Rorie, an assistant professor in the Division of Allergy and Immunology at the University of Nebraska Medical Center. That’s because the immune system sometimes confuses proteins in the plants for pollen proteins, he said.
What causes seasonal allergies to develop?
Seasonal allergies are reactions to environmental elements like pollen or mold spores that tend to swirl around in the air during certain times — such as in the spring, when plants pollinate. When you’re allergic to something like pollen, your immune system perceives it as a threat and triggers a chain reaction at the point of exposure. Antibodies in the nose or lungs stimulate the release of chemicals like histamine, which can lead to the sneezing, runny nose or congestion.
Scientists aren’t exactly sure why you can develop new allergies or symptoms without ever having had them before, but there are several potential causes. For one, climate change is causing allergy season to start earlier and last longer, so it makes people more prone to developing symptoms, experts said.