You’ve never had allergies before. But why are you sneezing now?
Or you’ve eaten something safely for 40 years. But now, it’s making you sick.
Welcome to the world of adult-onset allergies.
We’ve always assumed that allergies develop during childhood, and we either keep them or “outgrow” them. But researchers are discovering that one can actually develop an allergy at any stage in life.
In this post, we’ll learn why your body suddenly becomes allergic to something it has tolerated for decades.
Yes, You Can Develop Allergies at 30, 40, 50 and Beyond
Allergies happen when the immune system (that thing that protects your body from diseases) overreacts to a harmless substance, called an allergen. Think of pollen, dust, certain foods, or medicines.
This reaction presents as sneezing, itching, runny nose, rashes, swelling, or stomach problems. In rare cases, it can cause a life-threatening reaction called anaphylaxis, involving difficulty breathing or severe swelling.
We are discovering that allergies can appear beyond childhood. Meaning, they show up in adults. In fact, there’s a growing number of adults developing allergies.
The 5 most prevalent adult-onset allergies are shellfish, milk, wheat, nuts, and soy.
In a survey of 40,443 Americans, for example, 45.3% developed at least one food allergy after 18 years old. Of that number, 24.9% initially developed it in adulthood. In other words, “One in four adults with food allergy develop a food allergy for the first time as an adult.”
We have limited knowledge for the Philippine population, but we do know that 20% of adult Filipinos are affected by allergic rhinitis, and 13% suffer from hives. The latter is higher than the global average pegged at 1%.
We can say that adult-onset allergies are common, and becoming more so over the years.
But why is this happening? How can a person suddenly become allergic?
Why You’re Suddenly Allergic?
Imagine touching a wire, and for decades nothing happens. Then one day, you touch the same wire, and it zaps you like you owe it money.
Something like that can suddenly happen with allergies.
Well, it may not have been so sudden. Changes may have been afoot before you actually noticed it. That said, here are 3 common reasons why adults develop allergies:
#1 Changes in the Immune System
As we age, the immune system undergoes many gradual changes. Some parts become less responsive, while others can become more reactive. The latter means that your immune system becomes less tolerant and could start reacting to substances that it used to consider harmless.
So if someone develops allergies at 45, say for pollen, the explanation may not be that their body suddenly encountered something completely new. Sometimes, the immune system itself acts differently towards something it has encountered many times before.
And one of the things that affects immune activity is hormones.
Hormones could incite changes in how the immune system works. For example, estrogen and progesterone interact with immune cells and can influence inflammation. This is why some women notice worsening asthma symptoms during pregnancy or around hormonal transitions (eg. menstrual cycle, perimenopause, menopause).
It’s also part of the reason why more women than men are affected by adult-onset allergies.
Adult-onset allergic reactions can be seen as the result of an immune system that’s been changing long-term.
#2 Changes In Exposure
Okay, this one’s the flip side of the first.
Adult-onset allergies don’t always begin because your body suddenly changed. Sometimes your surroundings changed first.
Sometimes the simplest explanation for a new allergy is that you are encountering something your body wasn’t exposed to before, or you’re encountering MUCH MORE of it than you used to.
Novel exposure, repeated exposure, and heavy exposure can trigger allergic symptoms.
A new home, a new job, a new pet, or even a renovation can change what your immune system encounters.
For example, you may have spent decades barely reacting to pollen, then relocate somewhere with different plants and much higher pollen levels. Suddenly, you find yourself sneezing away those watery eyes. That’s because you’re being exposed to allergens more often and/or in greater amounts.
But you don’t even have to move to get exposed to new allergens. Your old home can introduce novel particles that tickle the fancy of your immune system. A leaking roof can create moisture and mold problems. A renovation can disturb years of accumulated dust. Removing old flooring can expose materials that weren't previously circulating through the air.
Not to mention, in a rapidly developing city, new factories or plants can introduce substances in the air/water that can impact downstream areas and nearby residences.
Your activities and practices as an adult can expose you to allergens. For example, as a kid, you didn’t need to wear makeup. Now, it’s part of your routine. You then have the risk of being exposed to cosmetic products with ingredients you’re allergic to.
If your allergy symptoms appeared later in life, ask yourself this question:
What changed in the six months or year before it started?
That can sometimes provide useful clues.
#3 Lifestyle & Health Factors
Many times, adult-onset allergies don’t have a clear and single cause. Multiple factors, vast and varied, can directly and indirectly lead to allergic symptoms:
Adults are more likely than children to take medications regularly, and some medications can cause reactions that resemble allergies. Of the adverse reactions to drugs, around 5-10 percent are allergic reactions.
Stress can influence immune and inflammatory processes and may worsen symptoms in some people with allergic conditions. Someone with mild eczema, hives or asthma, for example, may notice that symptoms become harder to control during periods of significant stress.
Sometimes there’s no obvious explanation
Allergic disease can result from several factors acting together, and sometimes the precise reason a person's immune system became reactive cannot be identified.
Adult-onset allergies can be the result of susceptibility, immune changes, exposures, health conditions, and other factors coming together. Sometimes, even after careful evaluation, the exact trigger remains unknown.
If you are one of those who develop allergies as an adult, what are you supposed to do? What are the best practices to follow?
Best Practices for Managing Adult-Onset Allergies
Track the triggers and symptoms. Note reactions that repeatedly occur after a particular food, medication, animal, or environmental exposure. Write down what happens, what you were exposed to, how quickly symptoms appeared, and how long they lasted.
See an allergist. Bring your notes from above, including the list of symptoms, medications and supplements, details about foods, pets, work, home conditions and other possible triggers. This will help determine what should be tested.
Once an allergen is confirmed, reduce exposure. Complete avoidance is often impossible, especially for things like pollen, dust and outdoor allergens. Know the 2-3 places where you spend most of your time and manage exposure there. For example, if dust is your problem. Have these specific rooms cleaned. The goal is to reduce meaningful exposure enough to keep symptoms under control.
For food allergies, avoidance needs to be precise. Read ingredient labels, and learn the different names an allergen may appear under. Also, consider possible cross-contact when food is prepared by others.
Live a healthy lifestyle. Triggers can be complex and indirect. Clean living can be an effective way to manage flare-ups. So eat balanced meals, get plenty of sleep, and exercise regularly. Minimize stress, and avoid smoking and alcohol.
Keep emergency medication with you at all times. People at risk of anaphylaxis should have their prescribed epinephrine readily available and know how to use it. Don't leave it at home because “I probably won't need it.” With allergies, you have to be prepared at all times.
Don't try to “build tolerance” on your own. Deliberately exposing yourself to a known allergen can be dangerous. Talk about immunotherapy with your doctor, where doses are more precise, and schedule and safety precautions are controlled.
Track your symptoms. This lets you know if your game plan is working. Note how often symptoms occur, if at all, and whether medication is actually helping.
Managing an adult-onset allergy is less about avoiding everything and more about knowing what affects you, reducing your exposure, and having a plan for unexpected reactions.
Once you know your triggers, the goal is to keep them from controlling your daily life while giving your immune system and symptoms the right support.
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