Pea allergy
Legume allergy to peas.
About pea allergy
Peas are a legume, related to lentils, chickpeas, beans, peanuts and soya, eaten fresh, frozen or dried, and increasingly used as pea protein in plant-based foods, protein powders and meat alternatives. Pea allergy is not among the most common food allergies but is being reported more often as pea protein spreads through processed foods. It is IgE-mediated: the immune system makes antibodies to pea proteins, and eating peas triggers a release of histamine and other chemicals.
Reactions usually begin within minutes to a couple of hours of eating. Symptoms range from an itchy mouth, hives and swelling to tummy upset, and in some people wheeze or anaphylaxis, so reactions can occasionally be serious. Because legumes share some proteins, a person allergic to peas may also react to lentils or chickpeas in particular, and there can be overlap with peanut in some individuals, although cross-reactivity is variable and being allergic to one legume does not mean reacting to all. The rise of concentrated pea protein means exposure can be greater than from whole peas.
Diagnosis is based on your history with skin-prick or specific-IgE testing, and sometimes a supervised food challenge. Management means avoiding peas and reading labels carefully, since pea protein and pea flour appear in a growing range of vegan products, snacks and supplements where they may not be obvious. If you are assessed to be at risk of a severe reaction, carry any prescribed adrenaline auto-injector. A severe reaction is a medical emergency: call 999.
Common triggers
- Pea 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.