Spring Pollen Cross-Reactivity: When Certain Foods Worsen Your Hayfever

For those living with hayfever, spring can be a particularly difficult season: rising pollen levels in the air often mean more sneezing, itching, and watery eyes. But what many people  don’t realise is that, in addition to pollen, certain everyday foods can also contribute to  symptoms – even if they’ve never caused a reaction before.

This condition is known as Oral Allergy Syndrome (OAS), or Pollen-Food Allergy Syndrome  (PFAS). It occurs when the body mistakes proteins found in fruits, vegetables or nuts for  pollen allergens.

Read on to understand how this cross-reaction works, which foods are most commonly  involved, and how to keep your diet allergy-friendly throughout the spring season.

Why does it happen? Understanding Pollen-Food Allergy Syndrome

Oral Allergy Syndrome is caused by a mechanism known as cross-reactivity: the immune  system identifies certain food proteins as if they were pollen particles, due to their similar  structure. This means someone who has never experienced a food allergy may begin to  notice mild reactions after eating specific raw foods – especially during the spring, when pollen levels are at their peak.

This phenomenon is most common in people with hayfever triggered by tree, grass or weed  pollen, and symptoms usually appear within minutes of eating the raw food.

Foods most likely to trigger a reaction in spring

The specific foods that cause reactions vary depending on the type of pollen to which someone is sensitive. Here are some typical examples of spring cross-reactivity:

• Birch pollen: apple, pear, carrot, celery, cherry, kiwi, peach and almonds
• Grass pollen: tomato, melon, orange, peach and potato
• Weed pollen (e.g., mugwort): celery, carrot, fennel, coriander and pepper

It’s worth noting that these reactions usually happen when the food is raw. Cooking, baking  or boiling the food often alters the protein structure enough to prevent symptoms from  occurring.

Is it a food allergy or a cross-reaction?

Unlike a classic food allergy, which can cause severe reactions at any time of year, Oral  Allergy Syndrome usually causes mild, localised symptoms in the mouth, lips, tongue or  throat, and typically only during pollen season.

Common symptoms include:

• Itching or tingling in the mouth
• Swollen lips
• Throat irritation

If these symptoms are seasonal and consistently triggered by a particular raw food, oral Allergy Syndrome is likely the cause.

Managing symptoms through diet during spring

A few simple strategies can help minimise discomfort during high-pollen seasons:

• Avoid raw foods that are known to cross-react with your specific pollen allergy
• Peel fruits and vegetables, as reactive proteins are often concentrated in the skin
• Cook, bake or steam foods to denature the proteins that trigger symptoms
• Keep a food diary and share it with your healthcare provider

Working with a health professional is essential to assess your symptoms and decide on the  best approach for your needs.

Can antihistamines help?

For some allergy symptoms like allergic rhinitis (hayfever), antihistamines like Histallay may play an important role. Allergic rhinitis causes symptoms such as sneezing, runny nose, and itchy eyes when exposed to pollen or other allergens. By blocking histamine receptors, Histallay may help reduce these symptoms.

Note: Histallay is specifically indicated for allergic rhinitis and is not indicated for Oral Allergy Syndrome. For OAS symptoms related to food cross-reactivity, please consult with a healthcare professional about appropriate treatment options.

Because it is typically non-drowsy in most people and suitable for daily use for up to 12 months, Histallay offers a consistent option for those looking to maintain symptom control throughout the allergy season.

Histallay offers a consistent option for those looking to maintain symptom control throughout the allergy season.

A complete approach to hayfever relief

Recognising that certain foods can intensify hayfever symptoms is a powerful first step in  improving your quality of life during spring. With a few dietary adjustments, a better  understanding of your triggers, it’s possible to navigate the season with improved symptom awareness and more consistent allergy management.

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