Celery Food Allergy: Symptoms, Causes, and How to Track Your Reactions

A celery food allergy is an immune system reaction to proteins in celery, one of the top 14 declared allergens in the European Union. It is particularly common in people who also have birch or mugwort pollen allergies, and it can range from mild oral tingling to severe anaphylaxis. If you suspect celery is causing your symptoms, the most important steps are to see an allergist for proper diagnosis, avoid celery in all its forms while you investigate, and start tracking your reactions in detail.

This guide covers the immune mechanisms behind celery allergy, the key proteins involved, cross-reactive foods, hidden sources of celery, and how systematic tracking can help you understand your own reactions.

What Is a Celery Food Allergy?

A celery food allergy is an IgE-mediated immune response to specific proteins found in celery (Apium graveolens). When a sensitized person eats celery - or sometimes even handles it - their immune system identifies one or more celery proteins as a threat and launches a defensive response. This is distinct from a celery intolerance, which involves digestive discomfort without immune system involvement.

Three key allergen proteins have been identified in celery:

• Api g 1 - the major celery allergen, belonging to the PR-10 (Bet v 1-homologous) protein family. Research shows Api g 1 shares approximately 40% amino acid sequence identity (and 60% similarity) with Bet v 1, the primary birch pollen allergen. This structural similarity is the molecular basis for birch pollen cross-reactivity. Api g 1 is heat-labile, meaning it breaks down with cooking.
• Api g 2 - a lipid transfer protein (LTP) found primarily in celery stalks. Studies show Api g 2 is heat-stable and highly resistant to digestion, meaning reactions can occur with cooked celery and may be more severe.
• Api g 4 - a profilin, another cross-reactive protein that may cause reactions in people sensitized to grass pollen or other plant foods.

Celery is one of the 14 allergens requiring mandatory declaration under EU food information regulations - meaning any food product sold in the EU that contains celery must clearly label it. This applies to both pre-packaged foods and food served in restaurants and cafes.

In terms of prevalence, research suggests celery allergy affects around 0.45% of European adults (approximately 1 in 200). In some regions the rate appears higher: in Switzerland, around 40% of food-allergic patients show sensitization to celery root, and in France, 30% of severe food allergy reactions were historically attributed to celery.

What Are the Symptoms of a Celery Allergy?

Celery allergy symptoms vary depending on which proteins are involved and the individual's level of sensitization. Symptoms can appear within minutes of exposure.

Oral allergy syndrome symptoms

The most common presentation - particularly in people whose celery allergy is driven by Api g 1 cross-reactivity with birch pollen - is oral allergy syndrome (OAS), also called pollen-food allergy syndrome (PFAS):

• Itching or tingling in the mouth, lips, or throat
• Mild swelling of the lips or tongue
• Scratchy sensation at the back of the throat
• Itchy or watery eyes

These symptoms typically appear within minutes of eating raw celery and usually resolve within an hour.

Skin and digestive symptoms

Some people experience reactions beyond the mouth area, including:

• Hives or a raised, itchy rash
• Eczema flare-ups
• Stomach cramps or nausea
• Bloating or diarrhea

Severe symptoms

Celery can cause anaphylaxis - a serious, potentially life-threatening allergic reaction - and this is an important distinction from many other pollen-cross-reactive foods. Research published in 2024 identified Api g 7 as an important risk marker: people sensitized to Api g 7 were approximately 6 times more likely to experience severe anaphylaxis than mild oral symptoms.

Severe symptoms that require immediate emergency care include:

• Difficulty breathing or wheezing
• Swelling of the throat or tongue
• Rapid drop in blood pressure
• Dizziness, confusion, or loss of consciousness
• Widespread hives beyond the mouth

If you have ever experienced these symptoms after eating celery, talk to your healthcare provider about carrying an epinephrine auto-injector.

Is It a Celery Allergy or a Celery Intolerance?

The distinction matters because a true allergy can potentially cause dangerous reactions, while an intolerance is uncomfortable but not life-threatening.

	Celery Allergy	Celery Intolerance
Immune system involved?	Yes (IgE antibodies)	No
Symptom onset	Usually within minutes	Can be delayed by hours
Severity	Can be serious or life-threatening	Uncomfortable but not dangerous
Common symptoms	Mouth tingling, hives, swelling, breathing issues	Bloating, gas, stomach cramps
Triggered by cooked celery?	Depends on allergen type	Often yes

Tracking your reactions precisely - including what you ate, how it was prepared, and when symptoms appeared - can help your healthcare provider determine which category applies to you.

Why Is Celery Connected to Birch Pollen and Mugwort Allergies?

Celery allergy is strongly associated with two types of pollen sensitization, giving rise to two well-recognized clinical syndromes.

The birch-celery connection is the most studied. Research has confirmed that birch pollen (Bet v 1) initiates sensitization to Api g 1 in celery, because the two proteins are structurally very similar. Once your immune system is trained to react to birch pollen, it may also recognize Api g 1 in celery as a threat - even though the two have nothing to do with each other biologically. This is particularly common in Central Europe and other regions with high birch tree exposure. Reactions driven by this mechanism tend to be milder (oral allergy syndrome), and because Api g 1 is heat-labile, cooked celery may be tolerated. The celery-mugwort-spice syndrome (also called the celery-carrot-mugwort-spice syndrome) is a separate but related pattern. First described in the research literature, this syndrome involves cross-reactivity between mugwort pollen and celery, often alongside reactions to carrots, parsley, fennel, coriander, and other spices from the Apiaceae plant family. This form is more common in Southern Europe and may involve different sensitizing allergens - including Api g 7, which recent research has linked to a higher risk of severe anaphylaxis.

For a related discussion of how birch pollen drives cross-reactive food allergies more broadly, see our guide to apple food allergy, which covers the same Bet v 1 mechanism in detail.

What Other Foods Cross-React With Celery?

If you have a celery allergy, you may also react to other foods that share similar protein structures. The pattern of cross-reactivity depends on which celery allergen is driving your reaction.

Apiaceae family foods

Celery belongs to the Apiaceae (carrot or parsley) family, and cross-reactivity within this family is common. Foods that may trigger reactions include:

• Carrot
• Parsley
• Fennel
• Coriander (cilantro)
• Dill
• Cumin
• Anise

Birch pollen cross-reactive foods

If your celery allergy is Api g 1-driven (birch pollen related), you may also react to:

• Raw apples, pears, peaches, and cherries
• Hazelnuts and almonds
• Kiwi - see our kiwi food allergy guide for more on this cross-reactive pattern
• Parsnip and other root vegetables

Mugwort cross-reactive spices

If your celery allergy is linked to mugwort sensitization, the following spices may also cause reactions:

• Anise and star anise
• Coriander
• Caraway
• Pepper (in some cases)
• Sunflower seeds

Tracking which other foods bother you alongside celery is one of the most practical ways to understand the underlying mechanism driving your allergy.

Where Does Celery Hide in Food?

Because celery is a declared allergen in the EU, manufacturers must label it on pre-packaged foods. However, it still appears in many unexpected places - and in countries outside the EU, labeling requirements are less strict.

Watch for celery in:

• Soups, broths, and stocks (celery is a fundamental base vegetable in most stock recipes)
• Bouillon cubes and stock powder
• Ready-made sauces, gravies, and condiments
• Celery salt (a common seasoning used in many spice mixes and condiments)
• Spice blends and mixed seasonings
• Worcestershire sauce and similar savory condiments
• Tomato juice and vegetable juice blends
• Coleslaw and prepared salads (celery seed dressings)
• Stuffing and stuffing mixes
• Deli meats and meat products (celery powder is sometimes used as a preservative)
• Herbal supplements and "detox" juice products
• Baby food and toddler pureed meals

Always check ingredient labels and, when eating out, ask specifically about celery in sauces, soups, and spice mixes.

Can You Eat Cooked Celery With a Celery Allergy?

Whether cooking makes celery safer depends entirely on which allergen proteins are driving your reaction.

If your allergy is Api g 1-driven (birch pollen cross-reactive): Api g 1 is a heat-labile protein - it denatures when exposed to heat. Many people with this type of celery allergy find they can tolerate well-cooked celery in soups or casseroles without symptoms, even though raw celery causes oral allergy syndrome. However, individual tolerance varies, and you should only test this under guidance from your healthcare provider. If your allergy involves Api g 2 (LTP) or Api g 7: These proteins are heat-stable and resistant to digestion. Research has confirmed that Api g 2 retains its IgE-binding capacity even after thermal denaturation. If your reactions are driven by LTP sensitization - or if you have experienced severe reactions - cooking is unlikely to make celery safe for you, and strict avoidance in all forms is generally recommended.

This is an important reason to pursue proper component-resolved diagnosis (see below), since knowing which celery protein is responsible for your reactions directly informs what you can and cannot safely eat.

How Is a Celery Allergy Diagnosed?

If you suspect a celery allergy, work with an allergist rather than self-diagnosing. The main diagnostic tools are:

• Skin prick test (SPT) - a small amount of celery extract is introduced to the skin surface to check for a localized reaction. Results are typically available within 15 to 20 minutes. Note that research suggests SPT sensitivity for celery allergy may be around 53%, so a negative result does not always rule it out.
• Specific IgE blood test - measures allergy-related antibodies to celery proteins in your blood. Component-resolved testing can identify which specific proteins (Api g 1, Api g 2, Api g 4, Api g 7) you are sensitized to, which helps predict both the likely severity of reactions and whether cooking may help.
• Oral food challenge - conducted under medical supervision, this involves eating gradually increasing amounts of celery to observe any reaction. It is considered the gold standard for confirming or ruling out a food allergy, per AAAAI guidelines.

Component-resolved diagnostics are particularly valuable for celery allergy because the different proteins predict very different clinical outcomes - from mild mouth tingling to anaphylaxis.

How to Track Your Celery Allergy Reactions

Tracking your reactions consistently is one of the most practical steps you can take to understand your celery allergy - especially given how often celery hides in processed foods and spice blends, and how your reactions may shift with pollen seasons.

Here is what to log every time you suspect a celery-related reaction:

• What you ate - the specific food, brand, and full ingredient list
• How the celery was prepared - raw, cooked, processed, or as a spice/seasoning
• How much you ate - portion size can matter, particularly for threshold-based reactions
• When symptoms appeared - time from eating to first symptom onset
• What symptoms you experienced - be specific (itchy lips vs. stomach cramps vs. hives)
• Severity - mild discomfort through to severe reaction requiring medical attention
• Pollen season - note whether you are currently in birch pollen season (typically spring) or mugwort season (late summer/fall), as this can affect reaction severity
• Other factors - exercise, fasting, alcohol, and stress may all amplify reactions
• Other foods eaten at the same meal - other Apiaceae family foods or cross-reactive spices

Over time, this kind of data reveals patterns that are very difficult to spot in the moment. You might notice your reactions to celery are consistently worse in spring, or that coriander always causes the same mouth tingling - pointing toward a mugwort or birch pollen connection. DietSleuth is designed for exactly this kind of pattern discovery. Log your meals, symptoms, and activities in one place, and let the AI surface correlations you might miss on your own - including seasonal patterns and cross-reactive food clusters.

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Living Well With a Celery Allergy

A celery food allergy is manageable with the right knowledge and a systematic approach to understanding your body's reactions. Here are the key steps:

1. Get properly diagnosed - work with an allergist to confirm whether your reaction is an allergy or intolerance, and use component-resolved testing to identify which celery proteins are involved
2. Know your cross-reactive foods - if celery bothers you, be aware of other Apiaceae family foods (carrot, parsley, fennel, coriander) and, depending on your sensitization pattern, birch or mugwort cross-reactive foods
3. Understand whether cooking helps you - if your allergy is Api g 1-driven, cooked celery may be tolerable; if LTP is involved, strict avoidance of all forms is typically necessary
4. Read labels carefully - celery hides in stocks, spice mixes, Worcestershire sauce, deli meats, and many prepared foods; in the EU it must be declared, but in other regions labeling may be less consistent
5. Track consistently - a detailed food and symptom diary that includes pollen seasons, food preparation methods, and cross-reactive foods is one of the most powerful tools for understanding your triggers
6. Partner with your healthcare provider - if you have ever experienced a severe reaction, discuss whether an epinephrine auto-injector is appropriate for you

Your body is giving you data every time you react. The more consistently you track it, the clearer the patterns become.

Frequently Asked Questions

Can celery allergy cause anaphylaxis?

Yes. Unlike many pollen-food cross-reactive allergies that cause only mild oral symptoms, celery allergy can cause anaphylaxis - a severe, potentially life-threatening systemic reaction. Research has identified Api g 7 sensitization as a significant risk marker for severe reactions. Anyone who has experienced difficulty breathing, widespread hives, or a drop in blood pressure after eating celery should speak to their healthcare provider urgently about formal allergy testing and an emergency action plan.

Is celery allergy the same as oral allergy syndrome?

Not always. Oral allergy syndrome (OAS) is a common presentation - particularly in people whose celery reaction is driven by Api g 1 cross-reactivity with birch pollen. OAS typically causes mild, mouth-area symptoms that resolve quickly. However, celery allergy can also cause more serious systemic reactions, especially when Api g 2 (LTP) or Api g 7 are involved. The two should not be assumed to be the same without proper diagnosis.

Why do my celery reactions seem worse in spring or late summer?

This is a recognized pattern. If your celery allergy is linked to birch pollen sensitization, your immune system may be more primed during birch pollen season (typically spring), making you more reactive to cross-reactive foods like celery at that time of year. If mugwort is the driver, symptoms may be worse in late summer and early fall, when mugwort pollen is at its peak. Tracking the season alongside your reactions is a useful way to spot this pattern.

Can I eat celery seed or celery salt if I have a celery allergy?

Celery seed and celery salt are concentrated forms of celery and should be avoided by anyone with a confirmed celery allergy. They are often hidden in spice mixes, condiments, and savory seasonings, so checking labels carefully is important. Under EU regulations, celery in all forms - including celery seed and celery salt - must be declared on food labels.

Is celeriac (celery root) the same as celery for allergy purposes?

Celeriac and celery stalk come from the same plant species (Apium graveolens) but different cultivars. They share the major allergens, including Api g 1 and Api g 2, so people with celery allergy will typically also react to celeriac. However, the distribution of allergens differs slightly - Api g 2 (LTP) is more concentrated in celery stalks, while celeriac may have a different allergen profile. Your allergist can test for both if needed.

This content is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider before making changes to your diet or health routine.

Sources

1. Breiteneder, H. et al., "Molecular characterization of Api g 1, the major allergen of celery (Apium graveolens), and its immunological and structural relationships to a group of 17-kDa tree pollen allergens," European Journal of Biochemistry, 1995. https://pubmed.ncbi.nlm.nih.gov/7588792/
2. Schimek, E.M. et al., "Bet v 1, the major birch pollen allergen, initiates sensitization to Api g 1, the major allergen in celery: evidence at the T cell level," European Journal of Immunology, 2003. https://pubmed.ncbi.nlm.nih.gov/14635038/
3. Pastorello, E.A. et al., "Sensitization prevalence, antibody cross-reactivity and immunogenic peptide profile of Api g 2, the non-specific lipid transfer protein 1 of celery," PLOS ONE, 2011. https://pmc.ncbi.nlm.nih.gov/articles/PMC3163685/
4. Wüthrich, B. et al., "Food allergy: the celery-mugwort-spice syndrome," Allergie et Immunologie, 1984. https://pubmed.ncbi.nlm.nih.gov/6734454/
5. Paul-Ehrlich-Institut, "New Insights on Celery Allergies and Associated Risks," press release, 2024. https://www.pei.de/EN/newsroom/press-releases/year/2024/07-new-insights-celery-allergies.html
6. Jahn-Schmid, B. et al., "Characterization of celery allergy confirmed by double-blind, placebo-controlled food challenge," Clinical and Experimental Allergy, 2000. https://pubmed.ncbi.nlm.nih.gov/10932083/
7. American College of Allergy, Asthma & Immunology, "Food Allergy Testing and Diagnosis." https://acaai.org/allergies/testing-diagnosis/food-allergy-testing-and-diagnosis/
8. Ribichini, E. et al., "Current State of Celery Allergy: Is Discovering Api g 7 a Milestone in Diagnosing Celeriac-Allergic Patients?" PMC / Nutrients, 2025. https://pmc.ncbi.nlm.nih.gov/articles/PMC12192819/