Birch Pollen Allergy and Food: Which Foods Cross-React and What Helps

If you are allergic to birch tree pollen, some raw fruits, vegetables and nuts may make your mouth or throat itch. This is called pollen food allergy syndrome (PFAS), also known as oral allergy syndrome. It happens because these foods contain proteins similar to those in birch pollen, and your immune system mixes them up.

It is very common: the American Academy of Allergy, Asthma and Immunology (AAAAI) says it happens in up to 50% to 75% of adults allergic to birch pollen. Most reactions stay in the mouth and are mild, but a small number become more serious. This guide lists the foods to watch, explains why cooking often helps, and covers when to see an allergist. For more on tree pollen, see our seasonal and pollen allergy guides.

Jump to: Quick answer · Foods linked to birch · Symptoms · When it can be serious · What helps · Diagnosis · FAQ

Quick answer

• Foods linked to birch pollen (ACAAI): apple, almond, carrot, celery, cherry, hazelnut, kiwi, peach, pear and plum. AAAAI adds that peanuts can cause mouth itching too.
• Symptoms: itchy mouth, scratchy throat, or swelling of the lips, mouth, tongue and throat, usually right after eating the raw food.
• Cooking often helps: heat changes the proteins, so many people can eat these foods baked, microwaved or canned.
• Usually mild, not always: in one study cited by ACAAI, symptoms spread beyond the mouth in nearly 9% of patients and caused anaphylactic shock in 1.7%.
• Nuts deserve extra care: AAAAI advises seeing an allergist if nuts make your mouth itch, since it may signal a more serious nut allergy.

Foods that cross-react with birch pollen

The American College of Allergy, Asthma and Immunology (ACAAI) lists these foods for each pollen type. Not everyone with a pollen allergy reacts to all of them, and many react to only a few.

Which foods cause trouble most often?

A Japanese study of 167 people with birch pollen allergy and pollen food reactions gives a sense of how common each trigger is. Apples caused symptoms in 74%, peaches in 67% and cherries in 55%, followed by pears and kiwi (37% each). About 10% reacted to soy milk; those reactions were linked to antibodies against a soy protein called Gly m 4.

That study was done in one country, so the exact numbers may differ elsewhere, but it fits AAAAI’s note that pitted fruits are common triggers for people with birch allergy.

Symptoms of birch pollen food syndrome

ACAAI lists the typical symptoms as an itchy mouth, a scratchy throat, or swelling of the lips, mouth, tongue and throat. AAAAI adds itching or swelling of the face. Symptoms usually stay around the mouth and often fade once the food is swallowed or removed.

ACAAI notes that it is more common in older children, teens and young adults, often after years of eating the food with no problems. People who get it usually have an allergy to birch, grass or ragweed pollen.

When it can be serious

ACAAI says it is rare for symptoms to spread beyond the mouth. Still, it points to a study in which pollen food syndrome progressed to symptoms elsewhere in the body in nearly 9% of patients, and to anaphylactic shock in 1.7%.

See an allergist, and talk to them about whether you need an epinephrine auto-injector, if you have:

• Significant throat tightness or trouble swallowing.
• Symptoms beyond the mouth, such as hives, vomiting or trouble breathing (AAAAI).
• Reactions to cooked forms of a food.
• Mouth symptoms from peanuts or tree nuts. ACAAI calls these high-risk foods, and AAAAI says mild mouth itching from nuts may signal a more serious allergic reaction.

Call 911 or your local emergency number for trouble breathing, throat swelling, or dizziness or fainting after eating.

What helps

1. Avoid the food in its raw form. ACAAI calls this the most common approach.
2. Cook it. Baking or microwaving breaks down the proteins responsible, AAAAI explains. Many people who react to a raw apple can eat applesauce or baked apples.
3. Try canned versions. AAAAI says canned foods may also limit the reaction.
4. Peel it. The protein is often concentrated in the skin, so peeling may help (AAAAI).
5. Don’t cut out foods that don’t bother you. You only need to avoid what you actually react to. Avoiding whole food groups can make eating well harder.
6. Ask about allergy shots. AAAAI notes that some studies have found allergy shots can improve these symptoms. Our guide to allergy drops versus shots explains the options.

Cutting your pollen exposure can also help your hay fever during birch season. See our pollen avoidance guide and how the seasons affect allergies.

How it’s diagnosed

ACAAI says the diagnosis is usually made from your history: which foods cause symptoms and what happens. In some cases an allergist may add skin prick tests or a supervised oral food challenge with the raw fruit or vegetable. AAAAI notes there is no single definitive test, and that affected people often test positive to a specific pollen.

A positive test to a food doesn’t always mean you will react to every form of it, so don’t cut foods out on a test result alone. Your allergist can tell you which foods to avoid and which are fine cooked.

This guide is general information, not medical advice. Read our medical disclaimer.

Frequently asked questions

What foods should I avoid with a birch pollen allergy?

Only the ones that cause you symptoms. The foods most often linked to birch pollen are apple, almond, carrot, celery, cherry, hazelnut, kiwi, peach, pear and plum. Many people can still eat them cooked.

Why can I eat apple pie but not a raw apple?

Heat breaks down the proteins that look like birch pollen to your immune system, so cooked, baked or canned versions often cause no symptoms.

Is oral allergy syndrome dangerous?

Usually not. Most reactions stay in the mouth. A small share of people have more serious reactions, so see an allergist if you get throat tightness, symptoms beyond the mouth, or reactions to nuts or cooked foods.

Is birch pollen food syndrome the same as a food allergy?

It is a type of food allergy, but it starts with a pollen allergy. Your immune system reacts to food proteins that resemble pollen proteins, which is why the foods are often fine once cooked.

Can birch pollen allergy cause a reaction to peanuts or soy?

It can. AAAAI says peanuts, almonds and hazelnuts may cause mouth itching in people with birch pollen allergy, and a Japanese study found about 10% of people with birch-related food reactions had symptoms after soy milk. Because nut reactions can be more serious, see an allergist.

Do allergy shots help oral allergy syndrome?

Some studies have found that allergy shots for pollen can improve these symptoms, according to AAAAI. Ask an allergist whether they make sense for you.

Sources

• American College of Allergy, Asthma and Immunology. Pollen food allergy syndrome (oral allergy syndrome). Reviewed March 21, 2019.
• American Academy of Allergy, Asthma and Immunology. Oral allergy syndrome (OAS) or pollen food syndrome.
• Yamamoto T, Asakura K, Shirasaki H, et al. Oral allergy syndrome following soy milk ingestion in patients with birch pollen allergy. Nihon Jibiinkoka Gakkai Kaiho. 2015;118(9):1124-1132. (In Japanese, with an English abstract.)

Last reviewed: October 21, 2026.