Nutmeg allergy
Spice allergy to nutmeg.
About nutmeg allergy
Nutmeg is a warm spice ground from the seed of a tropical tree, used in baking, sauces and drinks. True IgE-mediated allergy to nutmeg is rare, and many reactions attributed to it are non-allergic sensitivity or the effects of eating large amounts, which can cause unpleasant reactions in anyone because of natural compounds in the spice. Where genuine allergy occurs, the immune system makes antibodies to nutmeg proteins that trigger histamine release on exposure. Because nutmeg is normally used in small quantities, reactions are encountered less often than with staple foods.
When an allergic reaction does happen it usually begins within minutes to a couple of hours of eating. Symptoms may include an itchy mouth, hives, swelling, a runny or blocked nose and digestive upset; more serious reactions are uncommon but possible, so spreading or breathing symptoms should be taken seriously. Separately, consuming very large quantities of nutmeg can cause a toxic reaction with nausea, dizziness and other effects, which is a poisoning rather than an allergy and affects anyone regardless of allergic status.
Diagnosis relies on your history, supported where useful by skin-prick or specific-IgE testing, since allergy, intolerance and dose effects can overlap. Management means avoiding nutmeg and checking labels and menus, as it hides in baked goods, spice blends, sauces and festive drinks. If you are assessed to be at risk of a serious reaction, an adrenaline auto-injector may be advised. Any severe reaction with breathing difficulty or collapse is a medical emergency: call 999.
Common triggers
- Nutmeg 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.