Pork allergy
Allergy to pork; pork-cat syndrome in some.
About pork allergy
Pork allergy is uncommon and can arise through more than one mechanism. In some people it is a straightforward IgE-mediated allergy to proteins in pig meat, particularly serum albumin. A distinctive form is pork-cat syndrome, in which people sensitised to cat albumin through their pet later react to pork because the two albumins are very similar. A separate condition, alpha-gal syndrome, follows certain tick bites and causes reactions to red meats including pork.
Presentation depends on the mechanism. Classic IgE allergy and pork-cat syndrome usually cause reactions within minutes to two hours of eating, with an itchy mouth, hives, swelling, stomach upset or, in serious cases, anaphylaxis; pork-cat reactions can be stronger with undercooked or cured meat. Alpha-gal reactions are characteristically delayed, often appearing three to six hours after eating, which can make them harder to connect to food.
Diagnosis uses the history alongside skin-prick or specific-IgE blood tests, including tests for pork, cat albumin and alpha-gal where relevant. Management centres on avoiding pork and, in alpha-gal syndrome, other mammalian meats, plus checking processed foods and gelatine. People at risk of severe reactions carry an adrenaline auto-injector. A severe reaction is a medical emergency: give adrenaline and call 999.
Common triggers
- Pork 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.