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Dr. Chrysoula I. Liakou MD, PhD
- Treated online: Yes, usually. A doctor can often diagnose it from your story and plan what to eat; reactions to nuts or soya milk, or severe reactions, need allergy tests.
- What it is: itching or swelling in the mouth from raw fruit, vegetables or nuts, because their proteins look like pollen proteins.
- How common: about 2% of UK adults, mostly people with hay fever to birch pollen; it is the most common food allergy in adults.
- What helps: avoiding the trigger foods raw: cooking destroys the allergen, so cooked, canned or microwaved fruit is often fine.
- Emergency: call 112 for throat or tongue swelling, difficulty breathing or swallowing, or feeling faint.
Do not book a video appointment if your throat or tongue is swelling, your voice is hoarse, you are struggling to breathe or swallow, or you feel faint after eating. Use an adrenaline auto-injector if you have one and call 112.
Can an online doctor treat oral allergy syndrome?
Yes, usually. Oral allergy syndrome is often diagnosed from your story alone: itching or swelling of the mouth, lips or throat a few minutes after eating certain raw fruits, vegetables or nuts, in someone with hay fever. A doctor by video can confirm that the pattern fits, explain which foods to avoid raw and which are likely safe, and recommend an antihistamine. Reactions to nuts, peanuts or soya milk, and severe or unusual reactions, need allergy tests in person.
How an online consultation helps with oral allergy syndrome
- The pattern confirmed: Mouth itching from raw foods, with hay fever, fits pollen food syndrome; other patterns need tests.
- Foods you can keep: Cooked, canned or different varieties are often fine, so you avoid only what you must.
- The rare risks checked: Nuts, soya milk, large amounts, exercise or asthma can make a reaction more severe.
- Hay fever treated too: Keeping hay fever and asthma under control is part of the plan.
What the doctor checks in an online consultation for oral allergy syndrome
The doctor asks about the foods and the symptoms, because the pattern usually makes the diagnosis. The doctor asks about:
- The foods: which ones, raw or cooked, and whether different varieties or peeled fruit cause the same reaction.
- The symptoms: itching or swelling of the lips, mouth, tongue, ears or throat, and how long it lasts.
- Warning signs: throat tightness, a hoarse voice, breathing difficulty, hives, being sick or feeling faint.
- Hay fever: when in the year your symptoms are worst, which points to the pollen involved.
- Nuts and soya: any reaction to nuts, peanuts or soya milk, which needs testing.
- Other factors: asthma, exercise after eating, and medicines taken around the reaction.
What is oral allergy syndrome?
Oral allergy syndrome, now usually called pollen food syndrome, is an allergic reaction to raw fruits, vegetables and nuts. The proteins in these foods look like the proteins in airborne pollen, so the immune system of someone allergic to pollen reacts to the food as well. This is called cross-reactivity.
It affects about 2% of adults in the UK, and is the most common food allergy in adults. It usually affects people with spring or summer hay fever, though some people with a pollen allergy on testing have no hay fever symptoms. Birch tree pollen is the most common pollen involved in the UK, and fresh fruits such as apple, peach and kiwi are among the foods UK adults react to most.
What are the symptoms of oral allergy syndrome?
Itching and mild swelling of the lips, tongue, mouth, ears and throat, usually starting 5 to 10 minutes after eating the raw food and settling within an hour. Peeling or scraping the food can cause itchy skin, sneezing and itchy eyes.
Occasionally people feel sick or are sick, and very rarely a reaction is severe, with breathing difficulty.
Is oral allergy syndrome dangerous?
Usually not: most reactions are mild and settle by themselves. A severe reaction is more likely:
- after a large amount of the food in a short time, such as nuts, soya milk, freshly squeezed juice or smoothies
- in people who react to many different plant foods
- with asthma that is not well controlled
- when the reaction happens only after eating and then exercising, or with certain medicines
Reactions to peanuts, tree nuts and kiwi, and an allergy to a different plant protein called lipid transfer protein, can cause more severe symptoms, which is why nut and soya reactions need testing.
Can oral allergy syndrome cause anaphylaxis?
Very rarely. Throat or tongue swelling, breathing difficulty or faintness after eating is anaphylaxis, whatever the cause, and needs adrenaline and a 112 call. See anaphylaxis.
Which foods cause oral allergy syndrome?
The foods depend on which pollen you are allergic to. These are the common links:
Swipe sideways to compare →
| Pollen | Fruits | Vegetables and others | Nuts and seeds |
|---|---|---|---|
| Birch and alder trees | Apple, apricot, cherry, kiwi, nectarine, peach, pear, plum, strawberry | Celery, carrot, soya, tomato, potato, peas, parsnip, bean sprouts, mange tout, green pepper, parsley, coriander | Almond, Brazil nut, hazelnut, walnut |
| Grass | Kiwi, melon, orange, watermelon, date | Potato, tomato, peas, wheat, Swiss chard | Peanut |
| Weeds, mainly mugwort | Apple, melon, orange, peach, tomato, watermelon | Celery, carrot, green pepper, onion, spices, fennel, coriander, parsley | Mustard, sunflower seed, aniseed |
You will not react to every food on the list: only avoid the ones that cause symptoms.
How do you manage oral allergy syndrome?
Avoid the foods that cause symptoms in their raw form. Cooking destroys the allergen, so many people can eat the same fruit or vegetable well cooked, canned or microwaved. For a mild reaction, stop eating the food and drink some water, and take a non-drowsy antihistamine if the symptoms are unpleasant.
Can I still eat fruit with oral allergy syndrome?
Yes, in most cases. Eat trigger fruits cooked, canned or microwaved, and test whether other varieties suit you: different varieties of the same fruit can behave differently. Lightly cooked vegetables, such as stir-fried bean sprouts, mange tout and carrots, and raw or roasted nuts can still cause symptoms. Peeling fruit under water or wearing gloves can stop the itchy skin and sneezing from handling it.
How do you calm down oral allergy syndrome?
Most reactions settle by themselves within an hour. Stop eating the food, drink water, and take a non-drowsy antihistamine, such as cetirizine, fexofenadine or loratadine, if the symptoms are severe or unpleasant. Do not rely on an antihistamine or an asthma inhaler if breathing or circulation is affected: that needs adrenaline and emergency care.
Does oral allergy syndrome go away?
There is no treatment that reliably makes it go away. Immunotherapy for pollen allergy helps hay fever, but it is not an effective treatment for pollen food syndrome, and food immunotherapy is still being studied. Most people manage it well by avoiding the trigger foods raw.
Prescription treatment
A prescription is never issued without a consultation. The doctor may recommend or prescribe an antihistamine and treat your hay fever or asthma. Adrenaline auto-injectors may be prescribed after a severe reaction. If the doctor prescribes, use the prescription at a pharmacy near you.
How do you know if you have oral allergy syndrome?
Itching in the mouth a few minutes after eating particular raw fruits, vegetables or nuts, which does not happen when the same food is cooked, in someone with hay fever, is the typical story, and a doctor can often diagnose it from that alone.
Tests are needed when the reaction involved peanuts, tree nuts or soya milk, or was severe or unusual. Skin prick tests can be done with the fresh fruit or vegetable, because processing changes the allergen, and component blood tests can separate pollen food syndrome from a true nut allergy. Avoid unproven tests sold by alternative practitioners. See allergy testing and nut allergy.
What might the doctor recommend for oral allergy syndrome?
What happens next depends on the foods, the symptoms and your other allergies. This is the framework the doctors use:
Swipe sideways to compare →
| What you have | Likely first step | Suitable for online care? | When in-person care is needed |
|---|---|---|---|
| Throat or tongue swelling, breathing difficulty or faintness after eating | Adrenaline and emergency treatment | No | Call 112 now |
| An itchy mouth from raw apple or other fruit, with hay fever | Diagnosis from your story, and advice on raw and cooked foods | Yes | Not usually needed |
| Reactions to more and more fruits and vegetables | Assessment and a referral | Yes, to assess | Allergy tests if many plant foods are involved |
| A reaction to nuts, peanuts or soya milk | Avoiding the food, and a referral | Yes, to assess | Allergy tests to rule out a true nut or soya allergy |
| Hay fever that is not well controlled | Treating the hay fever | Yes | Not usually needed |
An itchy mouth after raw fruit? A doctor can confirm the cause and tell you what you can still eat in one consultation.
See available times →Special situations
Hay fever and asthma
Keep taking your hay fever and asthma treatment: uncontrolled asthma makes a severe reaction more likely. See hay fever and asthma.
Vegetarian and vegan diets
Avoiding raw trigger foods is harder on a plant-based diet, and people who also react to nuts or soya need a careful plan, ideally with a specialist.
Pregnancy and breastfeeding
Speak to a doctor or pharmacist before taking an antihistamine: loratadine is usually recommended if you need one in pregnancy.
Children
Mobi Doctor consultations are for adults aged 18 and over. A child who is unwell needs a paediatrician or a local doctor in person, and emergency signs in a child mean 112.
When oral allergy syndrome is treated online, and when you need in-person care
Treated online: diagnosing pollen food syndrome from your story, advice on raw and cooked foods, antihistamines, hay fever and asthma treatment, and referral when tests are needed.
In-person care: allergy tests for reactions to nuts, peanuts or soya milk, severe or unusual reactions, and anaphylaxis.
When to get in-person care
Use an adrenaline auto-injector if you have one, and call 112 now for:
- swelling of the throat or tongue, a hoarse voice, or difficulty swallowing
- difficulty breathing or wheezing
- feeling faint, dizzy or confused, or collapsing
Get medical advice the same day for:
- hives, or swelling beyond the lips and mouth, after eating
- being sick after eating a raw fruit, vegetable or nut
- a reaction to nuts, peanuts or soya milk
How Mobi Doctor works
- Book a time that suits you: daily 7am–11pm CEST. You can see a doctor over video, usually within 15 minutes. No subscription, and the exact price is shown before you pay.
- Speak to a licensed doctor about your symptoms: say which foods, raw or cooked, what happens and how long it lasts, and when your hay fever is worst.
- Leave with a plan: which foods to avoid raw, which you can still eat, what to take, and which signs mean you should be seen in person. If the doctor prescribes, use the prescription at a pharmacy near you.
No sign-up needed
Not sure it’s oral allergy syndrome? Tick every symptom you have to see each condition page that mentions it. It finds the right page, not a diagnosis: a doctor gives you that on a video call.
Tap the body — an area or a point — to browse symptoms anywhere
Similar symptoms, different condition? Nut Allergy can start the same way. Compare them, or look up any other symptom in the full symptom checker.
Frequently asked questions about oral allergy syndrome
What is oral allergy syndrome?
An allergic reaction to raw fruits, vegetables and nuts in people allergic to pollen, because the food proteins look like pollen proteins. It is also called pollen food syndrome.
What are the symptoms of oral allergy syndrome?
Oral allergy syndrome causes itching and mild swelling of the lips, tongue, mouth, ears and throat, usually starting 5 to 10 minutes after eating the raw food and settling within an hour.
Is oral allergy syndrome dangerous?
Usually not: most oral allergy syndrome reactions are mild. Severe reactions are rare, and more likely with large amounts of nuts, soya milk, juices or smoothies, uncontrolled asthma, or exercise after eating.
Can oral allergy syndrome cause anaphylaxis?
Very rarely. Oral allergy syndrome usually stays in the mouth, but severe reactions have been reported, mostly after large amounts of nuts, soya milk, juices or smoothies, or when asthma is poorly controlled or you exercise after eating. Throat swelling, breathing difficulty or faintness after eating is anaphylaxis, which needs adrenaline and a 112 call, and anyone who has had such a reaction needs an allergy specialist.
Can I still eat fruit with oral allergy syndrome?
Usually yes. Cooking destroys the allergen, so cooked, canned or microwaved fruit is often fine, and other varieties of the same fruit may suit you.
What can I do myself about oral allergy syndrome?
Peel, cook, microwave or tin the fruits and vegetables that set off your oral allergy syndrome, because heat destroys the allergen; keep a note of which raw foods react and in which season; treat your hay fever properly, since symptoms are worse when the pollen allergy is active; and keep a non-drowsy antihistamine to hand. Avoid large amounts of raw nuts, soya milk and smoothies, which are more likely to cause a stronger reaction.
How do you calm down oral allergy syndrome?
Stop eating the food, spit out what is in your mouth and drink water; most oral allergy syndrome reactions settle within an hour on their own. A non-drowsy antihistamine helps if the itching or swelling is unpleasant, and a cold drink soothes the mouth. Swelling that spreads to the throat, wheeze or difficulty swallowing is not oral allergy syndrome and needs emergency care.
Does oral allergy syndrome go away?
There is no treatment that reliably makes it go away: pollen immunotherapy helps hay fever but not pollen food syndrome. Most people manage it by avoiding trigger foods raw.
How long does oral allergy syndrome last?
Each reaction usually settles within an hour, and often sooner once you stop eating the food. The syndrome itself tends to be long-term, because it is tied to your pollen allergy, and it is often worse in the pollen season; there is no treatment that reliably makes it go away, though immunotherapy for the pollen helps some people, and the list of foods that trigger it can change over the years.
How common is oral allergy syndrome?
It affects about 2% of UK adults and is the most common food allergy in adults, mostly in people with hay fever to birch pollen.
Is it oral allergy syndrome or a true food allergy?
Oral allergy syndrome causes itching and mild swelling limited to the mouth, lips and throat, soon after raw fruit, vegetables or nuts, in someone with hay fever, and the cooked food is fine. A true food allergy causes hives, widespread swelling, sickness, wheeze or anaphylaxis, reacts to the food cooked as well as raw, and can be set off by tiny amounts. A reaction to nuts needs a specialist to tell the two apart, because the advice differs.
Which foods cause oral allergy syndrome?
With birch pollen allergy, most often apple, cherry, kiwi, peach, pear, plum, carrot, celery, hazelnut and almond. Grass and weed pollens link to other foods, such as melon, tomato and orange.
Can oral allergy syndrome be prevented?
The reactions can be, even though the underlying pollen allergy cannot. Oral allergy syndrome is pollen allergy crossing over to raw fruit, vegetables and nuts, so avoiding the trigger foods raw prevents most reactions, and cooked, canned or different varieties of the same food are often fine, so you avoid only what you must. Most people manage oral allergy syndrome well this way, and an antihistamine covers an accidental reaction.
Can an online doctor treat oral allergy syndrome?
Yes, usually. A doctor can often diagnose it from your story and plan what you can eat. Reactions to nuts or soya milk, or severe reactions, need allergy tests.
- Oral allergy syndrome (pollen food syndrome), Allergy UK, factsheet, published 6 July 2021.
- BSACI guideline for the diagnosis and management of pollen food syndrome in the UK, Skypala IJ, et al. Clinical and Experimental Allergy, 2022.
- Around 6% of the UK adult population have a food allergy, Food Standards Agency (UK), updated 16 May 2024.
- Food allergy and food intolerance, BDA, British Dietetic Association, food fact sheet, reviewed March 2024.
- Peanut and tree nut allergy, Anaphylaxis UK, factsheet, accessed 15 October 2026.
- Antihistamines, NHS, National Health Service (UK), reviewed 16 May 2023.
This page is for information only and is not a substitute for a medical consultation. Guideline links are provided for transparency; treatment decisions are made with your doctor.
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