Cross allergy: pollen allergy sufferers should be careful with these foods

Frau beim Blumenkauf mit Einkaufstasche Frau beim Blumenkauf mit Einkaufstasche

Most people who suffer from hay fever know that spring is the time when their problems return. The pollen flies through the air, watery eyes are the order of the day, special caution is required. But did you know that, depending on the type of pollen to which you're allergic, you should be particularly cautious about eating certain foods?

What is cross allergy?

Why should I give up apples if I'm allergic to birch pollen? About 70 percent of sufferers of a tree pollen allergy (e.g. birch, alder, hazel) have cross-allergies, also called cross-reactions with food because their proteins are very similar. Our immune system can't distinguish whether the proteins are those of birch or apple. It only recognises the allergen as dangerous - and a cross-reaction occurs.

Symptoms of cross-allergy

Anyone suffering from hay fever and experiencing the following symptoms while eating should avoid these foods, at least during the pollen season.

  • itching in mouth and throat
  • hoarseness
  • hoarseness
  • puffiness of the eyelids
  • digestive problems
  • swelling of the mouth, tongue and lips

However, many proteins, and thus allergens, are destroyed when cooking or heating and can therefore still be eaten.

Our immune system can't distinguish whether the proteins are those of birch or apple. It only recognises the allergen as dangerous - and a cross-reaction occurs.

The following cross-allergies are typical

January–April: birch, alder, hazel

Pome and stone fruit (apples, pears, plums, apricots, cherries, etc.), hazelnuts, walnuts, almonds, tomatoes, carrots, celery, mango, avocado, fennel, kiwi, lychee.

July–August: mugwort

Celery, carrots, fennel, artichokes, chamomile, pepper, mustard, dill, parsley, coriander, caraway, aniseed, sunflower seeds.

May–July: grasses

Allergy to grasses can cause sensitivity to certain foods, such as peanuts, potatoes, soya, kiwi, tomatoes, melon, cereals, peppermint. However, these don't usually cause an allergic reaction when eating these foods.

aha! Swiss Allergy Centre

Current pollen forecast

Find out which pollens are airborne in which areas of Switzerland at any given time.

Visit pollen radar (in german)

Latex or house dust mites

But cross-reactions with food aren't always triggered by pollen alone. An allergy to latex or house dust mites can also cause a reaction.

  • House dust mites: shrimps, lobsters, crawfish, crabs, snails
  • Latex: avocado, banana, sweet chestnut (vermicelli, chestnut), kiwi, papaya, fig, paprika

Risk of anaphylactic shock

In the worst case, the allergy triggers respiratory distress or circulatory arrest. In the case of a so-called anaphylaxis, it's vital that allergy sufferers know the most important rules of behaviour and emergency measures, but also how to avoid potential allergens. CSS Insurance has joined forces with the aha! Swiss Allergy Centre to offer an anaphylaxis course for adults, young people, and parents of affected children.


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