Avocado allergy
Avocado allergy, sometimes linked to latex.
About avocado allergy
Avocado is a nutrient-rich fruit, and allergy to it is uncommon but well described. It can arise in two main ways. In some people it is an IgE-mediated reaction linked to latex-fruit syndrome: those allergic to natural rubber latex may cross-react with avocado because the fruit shares similar proteins with latex. In others, avocado allergy is linked to birch pollen and behaves as a milder pollen-food syndrome. The immune mechanism in both is IgE antibody production against avocado proteins.
Symptoms usually begin within minutes to a couple of hours of eating. In milder pollen-related cases they may be limited to an itchy or tingling mouth. In people with latex allergy, reactions can be more pronounced, including hives, swelling, stomach upset and, occasionally, anaphylaxis. Anyone with a known latex allergy who reacts to avocado should be alert, as several other fruits such as banana, kiwi and chestnut can be involved in the same latex-fruit pattern.
Diagnosis is guided by the history, particularly any latex allergy or pollen hay fever, supported by skin-prick tests or specific-IgE blood tests. Management is based on avoiding avocado and, where relevant, managing the underlying latex allergy and being cautious with associated fruits. People at risk of severe reactions may be prescribed an adrenaline auto-injector. If a reaction ever involves breathing difficulty, throat swelling or collapse, use adrenaline if available and call 999 immediately.
Common triggers
- Avocado 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.