Adult-Onset Allergies: Why They Happen and How to Manage Them

As the weather warms, allergy symptoms like sneezing are becoming more common. But it’s not just children who are affected; a growing number of adults are experiencing allergies for the first time later in life. This article explores the reasons behind this phenomenon and how to manage adult-onset allergies.

Can You Develop Allergies at Any Age?

It’s a common misconception that allergies are a childhood affliction. In reality, allergies can emerge at any point in life, often triggered by changes in lifestyle or environment. Dr. Gérald Kierzek, an emergency physician and medical director at Doctissimo, confirms, “There is no age limit for developing allergies.”^{1, 2}

While allergies frequently appear in childhood, particularly food allergies to milk or eggs, they can also manifest during adolescence, adulthood (to pollens, dust mites, or medications), and even after the age of 50 or 60.² Repeated exposure to an allergen or a change in environment can contribute to this delayed onset. Allergies to medications and insect stings are particularly common in older adults.²

What Causes Adult-Onset Allergies?

The development of allergies is multi-factorial, resulting from an interaction between genetic and environmental factors.² Heredity plays a significant role – having one or both parents with allergies increases a child’s risk by three to five times.² Although, environmental factors also contribute, including:

• Air pollution
• Changes in the gut microbiome linked to aging
• Illnesses like the flu or COVID-19, which can weaken the immune system
• Excessive hygiene, limiting exposure to microbes
• Modern diet
• Stress

Changes in the gut microbiome, linked to aging, can also weaken the immune system and increase susceptibility to allergies.² illnesses like the flu or COVID-19 can compromise the immune system, potentially raising the risk of developing allergic reactions.²

Understanding Allergic Sensitivities

If you’re experiencing allergy symptoms, identifying the trigger is crucial. Common allergens include pollens from trees like cypress, ragweed, and birch, which are highly allergenic in France.²

Biologically, an allergy is an abnormal reaction of the immune system involving IgE antibodies. The body becomes sensitized upon first contact with the allergen without causing symptoms. Subsequent exposure triggers the release of histamine from mast cells, leading to allergic manifestations.²

The Rising Prevalence of Allergies

The prevalence of allergies has increased significantly in recent decades. In France, there has been a reported rise of around 30% over the past twenty years, often attributed to a combination of pollutants and allergens.²

Managing Adult-Onset Allergies

While there’s no miracle cure, several approaches can help reduce allergy symptoms:

• Allergen Immunotherapy (Desensitization): Gradually accustoming the body to the allergen can be effective in 70 to 80% of cases, particularly for pollen, dust mites, or insect venoms, after three to five years of treatment.²
• Allergen Avoidance: Minimizing exposure to known allergens is a key strategy.
• Symptomatic Treatments: Antihistamines and local corticosteroids can help control allergic reactions.²

Research is ongoing into potential immune-modulating treatments, such as probiotics and certain micronutrients like vitamin D.² Some food allergies, like those to milk or egg, may resolve spontaneously before the age of 3 to 6 years.²

When to Notice a Doctor

Dr. Kierzek recommends consulting an allergist for an assessment, including skin tests or prick tests, to determine the specific allergens causing your symptoms and develop a personalized treatment strategy.^{2, 4} Never dismiss an allergy; proper diagnosis and management are essential, especially if you also have asthma.⁴

Disclaimer: This article provides general information and should not be considered medical advice. Always consult with a qualified healthcare professional for diagnosis and treatment of any medical condition.