Pollen Cross Reactivity Chart: Foods and Allergies

When your immune system reacts to pollen, it sometimes mistakes proteins in certain fruits, vegetables, and nuts for that same pollen, triggering allergic symptoms when you eat them. This phenomenon, known as pollen-food allergy syndrome, follows recognizable patterns: birch pollen links to apples and hazelnuts, mugwort links to celery and spices, ragweed links to melons and bananas, and so on. The connections aren’t random. They trace back to specific families of proteins shared between pollen and food, and which pairings matter for you depends on your geographic region, your sensitization profile, and the type of protein driving the reaction.

The Major Pollen-Food Pairings

Allergists have mapped out a web of recognized cross-reactive syndromes, each named for the pollen source and the foods most commonly involved. These syndromes range from mild mouth tingling to, in rarer cases, full-blown anaphylaxis. The most well-documented groupings include birch-apple syndrome, celery-mugwort-spice syndrome, ragweed-melon-banana association, and cypress-peach syndrome, among others.

  • Birch pollen: apples, hazelnuts, cherries, pears, peaches, plums, carrots, celery, soy, kiwi, and almonds. This is the most studied cross-reactivity pattern and the most common in northern Europe and other birch-endemic regions. The culprit is a group of proteins related to the major birch allergen Bet v 1.
  • Mugwort pollen: celery, carrots, spices (especially fennel, coriander, cumin, anise), peach, chamomile tea, and mustard. Mugwort-related syndromes go by various names depending on which foods are involved, including celery-mugwort-spice syndrome and mugwort-peach association.
  • Ragweed pollen: melons (watermelon, cantaloupe, honeydew), bananas, zucchini, and cucumber. This pattern is especially common in North America, where ragweed is the dominant late-summer allergen.
  • Grass pollen: tomatoes, potatoes, melons, oranges, peanuts, and wheat. Grass pollen cross-reactivity tends to be less clinically dramatic than birch-related reactions, partly because the shared protein (profilin) is typically heat-sensitive and breaks down easily during digestion.
  • Cypress pollen: peach, citrus fruits, and other stone fruits. This pairing is driven by gibberellin-regulated proteins and is most relevant in Mediterranean areas with heavy Cupressaceae tree pollen.

These syndromes were identified through decades of clinical observation and confirmed through laboratory studies showing shared antibody-binding sites between the pollen and food extracts.

1PubMed Central. Cross-reactivity between aeroallergens and food allergens A broader list also includes some less common cross-reactions, such as goosefoot pollen with melon and Alternaria mold with spinach, though these are rarer in clinical practice.

The Proteins Behind the Cross-Reactions

What ties a birch tree to an apple or a ragweed plant to a cantaloupe is not the whole organism but specific protein families that are structurally similar across unrelated plant species. Your immune system produces antibodies against the pollen protein, and those same antibodies latch onto the look-alike protein in food. Several protein families are responsible for most of the clinically relevant cross-reactions, and knowing which one is involved changes the practical picture considerably.

PR-10 proteins, the family that includes birch’s Bet v 1, are the classic drivers of the birch-apple connection. These proteins are fragile: they fall apart with heat and are quickly destroyed by digestive enzymes. That’s why people with birch-apple syndrome can usually eat cooked apples or apple pie without trouble but react to a raw apple.

2PubMed. Recombinant PreS-fusion protein vaccine for birch pollen and apple allergy

Profilins are found in virtually all plant cells, from grass pollen to bananas to latex. Because they are so highly conserved across species, they can cause broad cross-reactivity on allergy tests. In practice, though, profilin-driven reactions tend to be mild or clinically irrelevant because these proteins are also quite fragile and don’t survive digestion well.

3PubMed. Profilins: mimickers of allergy or relevant allergens? Research has shown, however, that even small changes in profilin’s amino acid sequence can determine whether antibodies recognize it or not, meaning profilin sensitivity varies more between individuals than was previously assumed.

4Communications Biology. A native IgE in complex with profilin provides insights into allergen recognition and cross-reactivity

Lipid transfer proteins (LTPs) are a different story entirely. These proteins are heat-stable and resist stomach acid, which means they can trigger reactions even in cooked or processed foods. LTP-driven allergies are the dominant cause of peach allergy in the Mediterranean and can produce severe reactions, including anaphylaxis.

5PubMed. Natural Tolerance Development to Peach in a Child with Lipid Transfer Protein Allergy Interestingly, cross-reactivity between LTPs in different plants can occur even when the proteins don’t share much linear sequence similarity; their three-dimensional shapes are similar enough for the same antibody to bind both.

6PubMed Central. Pollen-Food Allergy Syndrome: From Food Avoidance to Deciphering the Potential Cross-Reactivity between Pru p 3 and Ole e 7

Gibberellin-regulated proteins (GRPs) are a more recently recognized family. They connect cypress pollen to peach, and the severity of peach reactions in cypress-allergic individuals appears to increase with higher cypress pollen exposure.

7PubMed. Pru p 7 sensitization is a predominant cause of severe, cypress pollen-associated peach allergy

Many of these cross-reactive proteins are defense-related molecules that plants evolved to fight off pathogens and pests. Because they serve critical survival functions, their structures have been conserved through millions of years of evolution, which is exactly why such distantly related species still share them.

8PubMed. Allergies to cross-reactive plant proteins. Latex-fruit syndrome is comparable with pollen-food allergy syndrome

Why the Same Food Can Be Harmless or Dangerous

One of the most confusing things about pollen-food cross-reactivity is that two people can both be allergic to peach and have completely different experiences. One person gets itchy lips from a raw peach but happily eats peach cobbler. The other ends up in the emergency room after eating cooked peach in a pastry. The difference almost always comes down to which protein family is driving the allergy.

PR-10 proteins and profilins are extremely sensitive to pepsin, the main digestive enzyme in the stomach, and they denature with heat. This means reactions driven by these proteins usually stay confined to the mouth and throat, where the protein contacts mucous membranes before being destroyed. This pattern of tingling, itching, or mild swelling limited to the lips, tongue, and palate is sometimes called oral allergy syndrome. LTPs and seed storage proteins, by contrast, survive cooking and digestion intact, so they can reach the gut and bloodstream and trigger systemic reactions.

9PubMed Central. Oral allergy syndrome by fruit and vegetable PR-10 allergy: Accuracy of in vivo diagnosis

This distinction matters for everyday food choices. If your allergist has identified PR-10 as your primary sensitization, baking, canning, or even microwaving the problematic food will usually eliminate the reaction. If LTP is the trigger, cooking won’t help and strict avoidance may be necessary.

Where You Live Changes Which Foods Bother You

Pollen-food cross-reactivity follows geographic lines because different regions have different dominant pollens. A large European study illustrates this clearly. In birch-endemic countries like Switzerland, the Netherlands, Poland, and Lithuania, roughly half of children sensitized to plant foods showed PR-10 sensitization, explaining why hazelnut, apple, peach, kiwi, carrot, and celery were the most common problem foods. In Greece and Spain, PR-10 sensitization was far less common, found in only about 8% and 15% of plant-food-sensitized children respectively. Instead, sensitization in the Mediterranean was more often driven by LTPs or primary food sensitization.

10ScienceDirect. Prevalence of Food Sensitization and Food Allergy in Children Across Europe

This geographic split has practical consequences. A person with peach allergy in Stockholm likely has a birch-PR-10-driven sensitivity that causes mild oral symptoms and responds to cooking. A person with peach allergy in Barcelona is more likely sensitized to LTPs or GRPs and faces a higher risk of severe reactions that cooking won’t fix. The same fruit, the same word “allergy,” but a fundamentally different clinical picture.

Cypress-peach syndrome follows a similar geographic logic. In areas with heavy Cupressaceae pollen, such as southern France, Italy, and parts of Japan, sensitization to the GRP allergen Pru p 7 becomes a significant cause of severe peach allergy, with the strength of sensitization correlating with local cypress pollen levels.

11PubMed Central. Pollen/Fruit Syndrome: Clinical Relevance of the Cypress Pollen Allergenic Gibberellin-Regulated Protein

The Latex-Fruit Connection

Latex allergy, which is most common in healthcare workers and people who’ve had multiple surgeries, comes with its own set of food cross-reactions that overlaps with but is distinct from the pollen-food syndromes. The most frequently implicated foods are banana, avocado, kiwi, and chestnut, though the list extends to peach, tomato, potato, and bell pepper.

12PubMed. Latex-fruit syndrome The shared proteins here are class I chitinases, plant defense enzymes that contain a domain structurally similar to hevein, a major latex allergen.

13PubMed. The latex-fruit syndrome

Laboratory studies have confirmed that latex, avocado, banana, and kiwi extracts share common antibody-binding sites, establishing the immunological basis for the clinical overlap.

14PubMed. Determination and characterization of cross-reacting allergens in latex, avocado, banana, and kiwi fruit If you have a known latex allergy, it’s worth being aware that you may react to these foods even if you’ve eaten them safely before, since sensitization can build over time.

When Tests Mislead

Cross-reactivity creates a significant headache for allergy diagnosis. Standard blood tests measure antibodies against whole food extracts, and those extracts contain multiple proteins. If you’re sensitized to a panallergen like profilin, your blood test might light up positive for dozens of foods, most of which you can eat without any problem. The result looks alarming on paper but doesn’t reflect clinical reality.

Component-resolved diagnostics, a newer approach that tests for antibodies against individual purified proteins rather than whole extracts, can cut through much of this noise. It can distinguish whether your hazelnut-positive test is driven by a PR-10 protein (probably mild oral symptoms) or by an LTP (potentially dangerous), which dramatically changes both the risk assessment and the dietary advice.

15PubMed Central. Component-Resolved Diagnosis in Food Allergies

Another diagnostic trap comes from cross-reactive carbohydrate determinants, or CCDs. These are sugar structures found on many plant and insect proteins. About 15 years of study have established that antibodies against CCDs don’t cause noticeable clinical symptoms, yet they can trigger false-positive results on blood allergy tests.

16PubMed Central. Coping with cross-reactive carbohydrate determinants in allergy diagnosis In one investigation, CCD-reactive antibodies were identified as the cause of false positives in a commercial allergy testing system, and none of the CCD-based allergens produced a positive reaction on skin testing.

17Journal of Allergy and Clinical Immunology. Specific IgE to cross-reactive carbohydrate determinants strongly affect the in vitro diagnosis of allergic diseases In practical terms, this means a blood test suggesting you’re allergic to 20 different foods may be reflecting CCD cross-reactivity rather than genuine food allergy. Skin prick tests and oral food challenges remain important tools for sorting out what’s real.

Cofactors That Can Tip a Mild Reaction Into a Severe One

Some people notice that a food they usually tolerate fine suddenly triggers a worse reaction after exercise, a glass of wine, or taking ibuprofen. This isn’t imagined. Cofactors can lower the dose of food allergen needed to trigger symptoms or amplify the severity of a reaction that would otherwise be mild.

18PubMed Central. Food allergies and food-induced anaphylaxis: role of cofactors

The most frequently reported cofactors are exercise, nonsteroidal anti-inflammatory drugs (like ibuprofen and aspirin), alcohol, and sleep deprivation.

19Annals of Allergy, Asthma & Immunology. Anaphylaxis: A 2023 practice parameter update Exercise-induced food-dependent anaphylaxis is a well-documented scenario in which eating a particular food is fine on its own, and exercise is fine on its own, but the combination triggers a severe reaction. For people with pollen-food syndrome involving LTPs or other stable allergens, being aware of these cofactors is especially relevant because their baseline reactions already have a higher ceiling of severity.

Cooking, Peeling, and Picking the Right Variety

For the majority of people with pollen-food syndrome, the sensitivity is driven by heat-labile proteins, and cooking is an effective workaround. But the research goes further than just “cook it or avoid it.” Studies on heating have found that it completely eliminated symptoms in roughly half of celery-allergic individuals and anywhere from 15% to 71% of hazelnut-allergic individuals, depending on the study and the degree of heating.

20MDPI (Nutrients). Dietary Interventions in Pollen-Related Food Allergy

There’s also research on apple cultivar differences. Certain varieties contain less of the offending allergen than others. Studies found that Santana apples (and possibly Elise) caused milder reactions than Golden Delicious in people with birch-apple oral allergy syndrome.

20MDPI (Nutrients). Dietary Interventions in Pollen-Related Food Allergy Two apple oral immunotherapy studies also found that gradual, controlled exposure to apple induced tolerance in a majority of participants. While this approach is still experimental, it suggests that not everyone with pollen-food syndrome is stuck permanently avoiding their trigger foods.

Peeling can sometimes help with stone fruits and apples because the allergen concentration tends to be higher in the skin. Freezing, however, doesn’t reliably denature the relevant proteins, so frozen fruit may still cause reactions if eaten raw after thawing.

Can Treating Your Pollen Allergy Fix the Food Reactions?

Since the food reactions are downstream of pollen sensitization, a logical question is whether treating the underlying pollen allergy with immunotherapy (allergy shots or sublingual tablets) also resolves the food symptoms. The evidence here is promising but modest. Case reports have documented individuals whose food allergy symptoms completely resolved after pollen immunotherapy, with measurable reductions in antibody binding to both pollen and food extracts.

21PubMed. Oral allergy syndrome successfully treated with pollen immunotherapy

Controlled studies, however, temper expectations. Research on birch pollen immunotherapy found that it did improve tolerance to apple and hazelnut in birch-allergic individuals, but the amount of food tolerated afterward was still small. The practical benefit, while real, was described as limited.

22PubMed. Effect of tree pollen specific, subcutaneous immunotherapy on the oral allergy syndrome to apple and hazelnut So pollen immunotherapy can help, and some people see their oral allergy syndrome fade significantly, but it’s not a guaranteed solution for the food component specifically.

Who Gets Pollen-Food Syndrome and When It Appears

Pollen-food syndrome rarely shows up in young children. It typically develops in older children, adolescents, and adults after pollen sensitization is already established, since the pollen allergy has to come first for the food cross-reactivity to follow. Clinical observations show that the condition is more common in females and in adolescents than in younger children, and that higher overall allergy antibody levels are associated with a greater likelihood of developing it.

23PubMed Central. Oral allergy syndrome in children

This age pattern explains why some adults are puzzled to suddenly react to a fruit they ate without issue throughout childhood. The cross-reactive food allergy doesn’t appear until the immune system has spent enough time exposed to pollen to build up a robust antibody response, and that response then “overflows” onto structurally similar food proteins. Seasonal variation is also common: people often notice their food reactions worsen during and just after pollen season, when circulating antibody levels are at their peak, and improve during winter months when pollen exposure drops off.