Orange allergy
Orange allergy.
About orange allergy
Orange is a citrus fruit enjoyed fresh and as juice, and used for its zest and oil in cooking and drinks. True IgE-mediated allergy to orange is uncommon; many reactions to citrus are irritant or contact effects from the acidic juice and the oils in the peel, or a reaction to additives in juice drinks, rather than a classic food allergy. Where genuine allergy exists, the immune system makes antibodies to orange proteins, and eating or handling the fruit triggers histamine release. Some sensitisation involves shared plant proteins such as lipid transfer proteins or pollen-related profilins.
Reactions usually begin within minutes to a couple of hours. Symptoms may include an itchy or tingling mouth, hives, swelling and tummy upset, while contact with juice or peel can cause localised redness, itching or a rash, especially around the mouth and on the hands, and this is common in children who are messy eaters. Most reactions are mild, but more serious reactions are possible, particularly where lipid transfer proteins are involved. There is often overlap with other citrus fruits such as lemon, lime and grapefruit.
Diagnosis is based on your history, supported by skin-prick or specific-IgE testing, sometimes with fresh fruit, to distinguish allergy from irritation. Management means avoiding orange in the forms that trigger you and reading labels, since citrus juice, flavouring and zest are widespread. If you are assessed to be at risk of a serious reaction, an adrenaline auto-injector may be advised, and any severe reaction is a medical emergency: call 999.
Common triggers
- Orange 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.