Banana allergy
Banana allergy, part of latex-fruit syndrome for some.
About banana allergy
Banana is a widely eaten fruit, and allergy to it is uncommon but recognised. It is an IgE-mediated allergy, and in many cases it forms part of latex-fruit syndrome: people allergic to natural rubber latex can cross-react with banana because the fruit contains proteins similar to those in latex. Banana allergy can also be linked to certain pollens, producing a milder oral pattern. Who is affected varies, but a personal or occupational latex allergy is an important clue.
Symptoms typically begin within minutes to two hours of eating. Milder reactions cause itching or tingling of the lips, mouth and throat, sometimes with slight swelling. More significant reactions can include hives, facial swelling, vomiting and, in people with latex allergy, occasionally anaphylaxis. Because of the latex link, some people who react to banana also react to avocado, kiwi and chestnut, so it is worth being aware of these related foods.
Diagnosis is based on the history, including any latex allergy, alongside skin-prick tests or specific-IgE blood tests. Management centres on avoiding banana and checking smoothies, baby foods, cakes and desserts where it may be hidden, as well as managing any underlying latex allergy. People at risk of severe reactions may carry an adrenaline auto-injector. If a reaction involves throat tightening, breathing difficulty or faintness, treat it as a medical emergency and call 999.
Common triggers
- Banana 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.