Health Info > Allergies Published on : May 3, 2025

Why do people develop allergies later in life?

Name: Hola Health
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Written by the editorial staff writer at Hola. Medically Reviewed by Dr. Ammar AL-ANI, MBChB, CCBST, AMC.

Why do people develop allergies later in life?

Summary: Individuals can develop allergies later in life due to immune system changes, increased exposure to allergens, hormonal fluctuations, stress, or environmental conditions. Relocating, experiencing infections, or making lifestyle adjustments can also lead to new sensitivities. While some allergies may diminish over time, others can arise unexpectedly, necessitating appropriate management and medical consultation.

Allergies are typically seen as something that affects children—itchy eyes, sneezing, and runny nose being the hallmarks of childhood discomfort. But what happens when you find yourself struggling with allergies as an adult? It can be a surprising twist, especially if you’ve had no issues in your younger years. The reality is, that more and more adults are developing allergies later in life, and while it might seem confusing, there are some interesting reasons behind this shift. Let’s explore why these annoying sensitivities can appear out of nowhere!

What are allergies?

Allergies are the immune system’s reaction to substances generally harmless to most individuals, like pollen, pet dander, dust, insect stings, or certain foods. When someone with an allergy encounters an allergen, their immune system mistakenly treats it as a threat and releases chemicals like histamine to protect the body. This results in symptoms such as sneezing, swelling, rashes, itching, or difficulty breathing. Essentially, allergies occur when the body’s defence system overreacts to something harmless.

Can you develop allergies later in life?

Yes, it is possible to develop allergies later in life, even if you’ve never had them before. This is known as adult-onset allergies. The immune system changes over time, and new sensitivities to substances like dust, pollen, pet dander, or certain foods may develop at any age. Factors such as stress, changes in the environment, exposure to new allergens, and alterations in the immune system's function can lead to a delayed onset. While allergies usually develop in childhood, more adults are experiencing them for the first time in their 20s and 30s, or even later.

Adult-onset allergies: What can trigger allergies later in life?

Adult-onset allergies can be caused by several factors, even if you’ve never experienced allergic reactions in the past. Common triggers include:

Environmental shifts:

Moving to a new location with varying allergens (e.g., pollen from local plants, pollution, or mould) can expose you to triggers that your immune system has not encountered previously.

Higher allergen exposure:

Over time, prolonged exposure to allergens such as dust mites, pet dander, or mould may lead to the development of sensitivities. For example, adopting a pet or spending more time in areas with heavy dust or mould might trigger allergies.

Stress:

Long-term stress can affect the immune system, making it more sensitive and potentially leading to allergies. Stress can also aggravate existing allergic conditions.

Weakened immune system:

As you age, your body’s defence mechanism may transform, becoming more sensitive or less capable of distinguishing between harmless agents and potential threats. This can make you more susceptible to developing allergic responses to substances that once posed no problem.

Lifestyle changes:

Lifestyle factors such as nutrition, inactivity, and inadequate rest can affect immune system performance, possibly causing allergic reactions. Furthermore, being exposed to pollutants, chemicals, or irritants in the workplace can increase the likelihood of developing sensitivities.

Hormonal changes:

Significant hormonal changes, such as those experienced during pregnancy or menopause, can affect the immune system and make some people more prone to allergies. Adult-onset allergies can be triggered by environmental changes, increased exposure to irritants, stress, weakened immune systems, and hormonal shifts. These factors can make the immune system more responsive, leading to the onset of allergic reactions in adulthood, even without previous sensitivities. Also read: What happens if you have allergies for a long time?

What should I do if I develop adult-onset allergies?

If you develop adult-onset allergies, here are some steps you can follow:

Identify triggers
Consult a doctor
Avoid exposure to known allergens (e.g., keep windows closed during high pollen season, use air purifiers)
Take medication
Consider lifestyle changes (e.g., Eating a balanced diet, managing stress, and taking adequate rest)
Explore natural remedies (e.g., nasal irrigation, herbal remedies)

Quick guidance and action from a healthcare professional can effectively help you manage and alleviate allergy symptoms If you develop adult-onset allergies, recognise triggers, seek medical advice for diagnosis, and avoid allergens. Consider making lifestyle adjustments, managing stress, and exploring natural remedies. A healthcare provider can assist you in managing your symptoms effectively and enhancing your overall quality of life.

Can allergies be prevented?

Allergies can't always be fully avoided, but their likelihood can be reduced, particularly in children, by implementing specific measures:

Early exposure and diet:

Exclusively breastfeeding for the initial six months might help reduce the chances of allergies in babies. Introducing popular allergens like peanuts, eggs, and dairy in small quantities during early infancy, approximately six months may aid in preventing food allergies. A nutritious diet abundant in fruits, vegetables, and probiotics fosters a resilient immune system.

Environmental precautions:

Minimising exposure to dust and pollen through regular cleaning, utilising air purifiers, and avoiding outdoor activities during high pollen times can be beneficial. It's crucial to avoid cigarette smoke and environmental pollution, as these increase the chances of respiratory allergies. For those sensitive to pet dander, limiting contact or ensuring pets are kept out of sleeping areas can help.

Strengthening immunity:

Promoting gut health with probiotics may assist in allergy prevention. Engaging with the outdoors and being exposed to natural environments and various microbes can also decrease risk.

Also read: Are there any effective natural solutions for allergies?

Allergy testing and medical interventions:

It is wise to seek advice from a doctor for early allergy testing and preventative strategies If there's a family history of allergies. Immunotherapy, such as allergy injections, can help in preventing severe allergic responses in certain situations.

Although genetics are a significant factor in allergy development, implementing preventative measures early on can help mitigate risk. Focusing on a healthy diet, maintaining a clean environment, and strengthening your immune system can help reduce the likelihood of developing allergies.

Can allergies stop on their own?

Certain allergies may reduce over time, whereas others may persist throughout life. Children frequently outgrow food allergies such as milk or eggs, but allergies to peanuts, shellfish, or pollen are more likely to continue. In some cases, decreased exposure or changes in the immune system can lessen allergic reactions. Treatments like immunotherapy may also provide relief. However, severe allergies, particularly those that lead to anaphylaxis, usually endure throughout life. If allergies disrupt daily life, it's advisable to consult a doctor for appropriate management.

While some allergies might improve or disappear over time, others could remain or even develop later in life. The likelihood of outgrowing an allergy depends on factors such as age, the body's immune response, and exposure to the allergen. People with persistent allergies can improve their quality of life by effectively managing their symptoms and seeking professional advice.

When to consult a GP

You should consider seeing a general practitioner if allergies result in ongoing or severe symptoms, such as frequent sneezing, nasal congestion, itchy eyes, or skin rashes. If allergies disrupt daily activities, sleep, or work, seeking medical advice can aid in effective management. Immediate medical help should be sought if you experience breathing difficulties, facial or throat swelling, dizziness, or anaphylaxis, as these could be life-threatening. A GP can also guide on allergy testing, immunotherapy, and medication choices.

Early consultation with a GP can help prevent allergies from escalating and improve overall health. Prompt medical advice ensures proper treatment, alleviating discomfort and minimising the risk of severe reactions.

Getting medical advice from an online doctor

Online doctors in Australia offer convenient and swift access to medical advice for allergies and various health issues. They can evaluate symptoms, suggest treatments, and prescribe medications when necessary. Virtual doctor consultations are particularly valuable for mild to moderate allergies, enabling patients to receive guidance without needing to visit a clinic. However, online doctors might face challenges in diagnosing severe conditions that require physical examinations or emergency care.

Virtual medical consultations provide a practical means for managing allergies and minor health problems. They provide medical certificates, instant scripts online, and online doctor referrals if needed. It is crucial to seek in-person medical assistance for serious or life-threatening allergic reactions.

FAQs

Why am I suddenly developing allergies?

Allergies can emerge at any age due to changes in the immune system, heightened exposure to allergens, or environmental influences. Factors such as stress, infections, and hormonal fluctuations can also lead to the onset of new allergies.

Even if you've never experienced allergies, your immune system can develop sensitivities to certain substances over time. Recognising triggers and obtaining medical advice can assist in managing new allergies.

What is the root cause of allergies?

Allergies arise when the immune system wrongly perceives harmless substances (allergens) as dangers, resulting in an exaggerated response. Genetics, environmental interactions, and lifestyle choices contribute to the onset of allergies.

Although genetics and environmental factors play a role in allergies, avoiding triggers and implementing proper management can alleviate symptoms.

Do allergies get worse as you age?

Allergies may improve, worsen, or remain unchanged as we age. Some individuals may outgrow allergies from childhood, while others might experience intensified reactions due to extended exposure or a compromised immune system.

Ageing can impact how the body responds to allergens, making it crucial to monitor symptoms and adapt treatments as necessary.

Can you develop allergies as an adult?

Yes, adult-onset allergies are fairly common. Changes such as relocating, altering one’s lifestyle, or immune system variations can lead to new allergic reactions later in life.

Allergies aren't just a childhood issue. If you notice new symptoms, seek a doctor’s guidance for diagnosis and management.

Why do I have allergies now when I didn't before?

Your immune system can evolve, increasing sensitivity to allergens. Factors like increased exposure, infections, stress, or hormonal changes may contribute to the development of allergies in later life. Life changes can trigger new sensitivities even if you've been free of allergies. Recognising and managing allergens promptly can help alleviate symptoms.

In conclusion, while the reasons for developing allergies later in life are complex, it’s clear that a combination of immune system changes, environmental influences, and lifestyle habits contribute. Whether it’s new exposures or your body reacting differently, adult-onset allergies are on the rise. So, if you are sneezing in your 30s and 40s, you are not alone—your immune system may simply be joining the allergy trend a bit late!

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