Chilli / capsicum allergy
Allergy or sensitivity to chilli and peppers.
About chilli / capsicum allergy
Chilli and other peppers (capsicums), including sweet peppers and cayenne, belong to the nightshade family alongside tomato and aubergine. Reactions to them can be of two kinds. True IgE-mediated allergy to pepper proteins does occur but is uncommon. More often, people experience irritation from capsaicin, the compound that makes chilli hot, which can cause burning, flushing, sweating and stomach upset that mimic an allergy but are actually a direct irritant or intolerance effect rather than an immune reaction.
Where genuine allergy is present, symptoms usually begin within minutes to two hours of eating and may include an itchy mouth, hives, swelling and, occasionally, more significant reactions. Some people with pollen or latex allergies react to peppers as part of broader plant-food sensitivities, and a few who handle chillies frequently develop contact irritation or dermatitis on the skin. Distinguishing true allergy from the ordinary irritant effects of spicy food can be difficult without assessment.
Diagnosis benefits from a careful history and food diary, supported where needed by skin-prick or specific-IgE blood tests carried out by an allergy specialist. Management depends on the cause: avoiding chilli and peppers if a true allergy is confirmed, or simply moderating spicy food if the problem is capsaicin irritation. Most reactions are mild, but if any reaction ever involves throat swelling, breathing difficulty or faintness, treat it as a medical emergency and call 999.
Common triggers
- Chilli / capsicum 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.