Grape allergy
Grape allergy.
About grape allergy
Grapes are the fruit of the vine, eaten fresh or dried as raisins, sultanas and currants, and pressed into juice and wine. Grape allergy is uncommon but genuine, and it works through the immediate, IgE-mediated pathway, with the immune system making antibodies to grape proteins that release histamine and other chemicals when the fruit is eaten. Some sensitisation involves widely shared plant proteins such as lipid transfer proteins, which are more stable and can be linked to stronger reactions in certain regions.
Reactions usually start quickly, within minutes to about two hours. Milder cases cause an itchy mouth, hives, an itchy rash or tummy upset, while more marked reactions can involve swelling, wheezing or, rarely, anaphylaxis, particularly where lipid transfer proteins are involved. Some people react to fresh grapes but tolerate dried forms or wine differently, and occasionally there is overlap with other fruits that share these proteins, such as peach and cherry. Wine and grape products may also contain sulphites, which can cause separate, non-allergic reactions.
Diagnosis is based on your history and supported by skin-prick or specific-IgE testing, sometimes with component testing to identify the exact proteins. Management means avoiding grapes and grape-derived products where they trigger you and reading labels, since raisins and grape juice appear widely in cereals, bakery items and sauces. If you are assessed to be at risk of a serious reaction, an adrenaline auto-injector may be advised. A severe reaction is a medical emergency: call 999.
Common triggers
- Grape and products containing it
Symptoms
- Itching or tingling in the mouth
- Hives, itching or eczema
- Swelling of the lips, face, tongue or throat
- Stomach cramps, nausea, vomiting or diarrhoea
- Wheezing or trouble breathing
- In severe cases, anaphylaxis
Avoidance & management
- Read ingredient labels every time
- Ask about ingredients and cross-contamination when eating out
- Keep the food out of shared cooking areas
- Carry prescribed antihistamines or an adrenaline auto-injector
- Seek emergency help for any severe reaction
Sources & references
Allergy safety: what everyone should know
Mild-to-moderate reaction signs
- Itching, hives or a raised rash
- Swelling of lips, face or eyes
- Tingling mouth, sneezing, runny nose
- Stomach pain, nausea or vomiting
Anaphylaxis — call 999 (UK) or 112 (EU) immediately
- Difficult or noisy breathing, wheeze, persistent cough
- Swelling of the tongue or tightness in the throat
- Dizziness, collapse, pale and floppy (young children)
- Use an adrenaline auto-injector (e.g. EpiPen) at once if prescribed, then call an ambulance even if symptoms improve
Allergy or intolerance? A true allergy involves the immune system and can escalate quickly; an intolerance (e.g. lactose intolerance) is unpleasant but not life-threatening. The symptoms overlap, so self-diagnosis is unreliable.
Getting tested: home-testing kits based on IgG are not diagnostically valid. If you suspect an allergy, ask a GP for referral to an allergy clinic for skin-prick or specific-IgE testing and a supervised food challenge where appropriate.