Pineapple allergy
Pineapple allergy.
About pineapple allergy
Pineapple is a tropical fruit that can cause allergic reactions, though genuine IgE-mediated pineapple allergy is fairly uncommon. It is worth distinguishing true allergy from irritation caused by bromelain, an enzyme in raw pineapple that breaks down protein and can leave the lips, tongue and mouth feeling raw or tingly in almost anyone who eats a lot of it. Where a real allergy exists, the immune system produces antibodies to pineapple proteins that trigger histamine release on exposure.
Allergic symptoms usually appear within minutes to a couple of hours and may include an itchy or swollen mouth, hives, stomach upset and, rarely, more widespread reactions with wheeze or breathing difficulty. Some people who react to pineapple also react to other bromelain-containing or latex-related foods, as pineapple is one of the fruits sometimes linked to latex-fruit syndrome, though this association is less established than for banana, avocado or kiwi.
Diagnosis relies on the history alongside skin-prick or specific-IgE testing, since a simple sore mouth from bromelain does not indicate allergy. Management means avoiding pineapple if it reliably causes symptoms and checking juices, fruit salads and desserts. Mild mouth irritation needs no treatment, but anyone with swelling of the throat, breathing difficulty or a widespread reaction should seek urgent help and call 999.
Common triggers
- Pineapple 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.