Celery can cause more than an itchy mouth

Because pollen-food syndrome is common in UK celery allergy, it would be easy to think celery reactions are generally trivial.

They aren't necessarily.

Celery can cause systemic allergic reactions, including anaphylaxis.

Controlled challenge research has documented systemic reactions in celery-allergic patients, and newer Api g 7 research reinforces the fact that clinically significant reactions occur in some celery-allergic populations.

Symptoms of an allergic reaction can involve the skin, gastrointestinal system, airway, breathing or circulation.

Someone at risk of anaphylaxis should follow the emergency plan given by their healthcare professional.

EatSafe's separate Recognising Anaphylaxis and Adrenaline and Food-Allergy Emergencies guides cover that properly rather than squeezing emergency medicine into every individual allergen page.

The celery-specific point worth remembering is:

Do not assume celery allergy is necessarily mild merely because pollen-food syndrome often is.

What does a celery reaction look like?

Celery can produce IgE-mediated allergic reactions ranging from relatively local symptoms to serious systemic reactions.

Possible symptoms can include:

itching or tingling in the mouth;

hives;

swelling;

gastrointestinal symptoms;

wheezing or breathing difficulty;

throat symptoms;

dizziness or collapse.

Some pollen-associated celery reactions may predominantly involve the mouth and throat, particularly with raw celery.

But celery is also capable of causing anaphylaxis.

The presence of pollen-food syndrome in some people should therefore not lead to the general conclusion that celery allergy is always mild.

Different molecular sensitisation patterns can produce different clinical pictures.

And previous reaction severity does not provide a perfect forecast of the next exposure.

EatSafe's separate guides to recognising anaphylaxis and adrenaline and food-allergy emergencies cover those subjects in detail rather than reproducing them here.

If anaphylaxis is suspected

The practical emergency message remains important enough to repeat.

For somebody prescribed adrenaline auto-injectors, follow the individual's emergency plan and device instructions.

Current UK guidance treats intramuscular adrenaline as the first-line treatment for anaphylaxis.

Call 999 and say anaphylaxis.

Antihistamines may have a role in relieving some skin symptoms, but they are not a substitute for adrenaline when dangerous airway, breathing or circulation problems are present.

Anaphylaxis can also occur without a dramatic rash.

Those are general food-allergy principles, but they matter every bit as much when the trigger happens to be celery.

How is celery allergy diagnosed?

Diagnosis begins with the clinical history.

What was eaten?

Was celery definitely present?

Was it raw or cooked?

How quickly did symptoms begin?

What symptoms occurred?

Has celery been eaten safely at other times?

Does the person have birch or mugwort pollen allergy?

Do they react to carrot, spices or other related plant foods?

That pollen history can be particularly informative in celery allergy because of the cross-reactive syndromes described earlier.

Skin-prick testing and specific-IgE blood testing may support the diagnosis.

In some circumstances, component-level testing can provide additional information about the proteins being recognised.

Where uncertainty remains and it is clinically appropriate, a medically supervised oral food challenge may sometimes be used.

But the same important rule applies as for every food allergy:

A positive allergy test demonstrates sensitisation; it does not, by itself, prove that eating celery causes clinical allergy.

Our EatSafe Knowledge articles on food-allergy diagnosis, skin-prick and blood tests, and oral food challenges explain those distinctions in depth.

Don't diagnose the whole spice rack from one celery test

Because celery participates in cross-reactivity with pollens and other plant foods, test results can become complicated.

Someone may show sensitisation to several related foods.

That does not automatically mean they need to avoid all of them.

If they routinely eat carrot or coriander without symptoms, a laboratory result should be interpreted in that clinical context.

Unnecessary avoidance is not a harmless precaution.

It can make diets more restrictive, eating out more difficult and anxiety greater.

The goal is not to identify every molecule an IgE antibody can bind in a laboratory.

The goal is to determine which foods actually matter to this person.

Is celery allergy common?

Celery allergy appears to have important geographical variation.

It has historically been particularly significant in parts of continental Europe, including countries where pollen sensitisation patterns and dietary exposure contribute to its prominence.

It is one of the allergens specifically regulated across the UK and EU, but that legal status should not be mistaken for a claim that celery is one of Britain's 14 most common allergies.

As with mustard, prevalence figures depend heavily on how allergy is defined.

Self-report.

Sensitisation.

Clinical history.

Food challenge.

These produce different numbers.

The safest statement is that celery is a recognised and potentially serious food allergen, with particular importance in some European populations, rather than pretending we possess a precise figure for the proportion of the UK population affected.

Sources and further reading