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Conditions We Treat

Nut Allergy Belfast

Nut allergy — including peanut and tree nut allergy — is one of the most common causes of severe allergic reactions in children. Specialist assessment provides accurate diagnosis, risk stratification and a clear safety plan.

Specialist nut allergy assessment for children at Belfast Allergy Clinic

Overview

Nut allergy encompasses both peanut allergy (peanuts are legumes, not true nuts) and tree nut allergy (cashew, walnut, almond, hazelnut, pecan, pistachio, Brazil nut, macadamia). Peanut allergy affects around 1–2% of children in the UK and is one of the most common causes of anaphylaxis. Tree nut allergy affects around 0.5–1% of children. Many children are sensitised to multiple nuts, though clinical reactivity to each nut varies. Nut allergy tends to be more persistent than milk or egg allergy — only around 20% of children outgrow peanut allergy. Accurate diagnosis using component-resolved diagnostics (CRD) allows precise risk stratification and avoids unnecessary avoidance of nuts that are unlikely to cause clinical reactions.

Expert paediatric assessment in Belfast — Dr Mugilan Anandarajan (FRCPCH) provides thorough, evidence-based evaluation and management for children aged 0–16. No GP referral required.

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Common Symptoms

  • Hives (urticaria), itching or skin redness within minutes of nut exposure
  • Swelling of the lips, tongue, face or throat (angioedema)
  • Vomiting or nausea shortly after eating nuts
  • Stomach cramps or diarrhoea
  • Runny nose, sneezing or watery eyes
  • Wheeze, cough or difficulty breathing
  • Throat tightening or a feeling of something stuck in the throat
  • Dizziness, pallor or feeling faint
  • Anaphylaxis — severe, life-threatening systemic reaction
  • Oral allergy syndrome — itching or tingling of the lips and mouth (particularly with hazelnut in pollen-sensitised children)

Causes & Triggers

  • Sensitisation to peanut proteins — Ara h 2 is the most clinically significant (predicts severe reactions)
  • Sensitisation to tree nut proteins — cashew (Ana o 3), walnut (Jug r 1), hazelnut (Cor a 14)
  • Cross-reactivity between peanut and tree nuts — common sensitisation, variable clinical reactivity
  • Cross-reactivity between tree pollens and hazelnut (Cor a 1) — causes oral allergy syndrome
  • Eczema — disrupted skin barrier allows sensitisation through the skin
  • Genetic predisposition — family history of atopic conditions
  • Delayed introduction of peanut in infancy — now discouraged by LEAP trial evidence
  • Cross-reactivity between peanut and other legumes (soy, lentil, pea) — clinically significant in a minority

Diagnosis & Testing

Dr Anandarajan takes a detailed history of reactions to specific nuts, the quantity involved, the form (raw, roasted, in a product), and the severity of symptoms. Skin prick testing is performed with individual nut extracts and fresh nut. Specific IgE blood tests are measured for individual nuts. Component-resolved diagnostics (CRD) are particularly valuable for nut allergy — Ara h 2 (peanut) and Ana o 3 (cashew) are storage protein markers that predict genuine clinical allergy and risk of severe reactions, while Ara h 8 (peanut) and Cor a 1 (hazelnut) are pollen cross-reactive proteins associated with oral allergy syndrome rather than systemic reactions. This distinction avoids unnecessary avoidance and identifies children at highest risk.

  • Skin prick testing (SPT) with individual nut extracts and fresh nut
  • Specific IgE blood tests for individual nuts — peanut, cashew, walnut, almond, hazelnut, pecan, pistachio, Brazil nut
  • Component-resolved diagnostics (CRD) — Ara h 2 (peanut), Ana o 3 (cashew), Jug r 1 (walnut), Cor a 14 (hazelnut)
  • Pollen-specific IgE — to distinguish genuine nut allergy from pollen-food syndrome
  • Basophil activation test (BAT) — for complex or equivocal cases
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Management & Treatment

Management of nut allergy is tailored to the specific nuts involved and the risk of severe reactions. Children with confirmed IgE-mediated nut allergy are prescribed an adrenaline auto-injector (EpiPen or Jext) and given a personalised written emergency action plan. Dr Anandarajan provides detailed advice on nut avoidance, food labelling, eating out safely, and managing nut allergy at school and nursery. Children with oral allergy syndrome (pollen-food syndrome) affecting hazelnut or other nuts do not require the same level of avoidance as those with genuine IgE-mediated nut allergy.

  • Personalised written allergy management and emergency action plan
  • Adrenaline auto-injector (EpiPen / Jext) prescription, training and school letter
  • Antihistamines for mild-to-moderate reactions
  • Advice on nut avoidance, food labelling, eating out and travel
  • School and nursery allergy management planning
  • Dietitian referral where multiple nut avoidances affect nutritional intake
  • Clarification of which nuts are safe to eat based on CRD results

When to Seek a Specialist Opinion

Your child has had a reaction to a nut — even a mild one
Your child has been prescribed an EpiPen but has never seen a specialist
You want to know which nuts are safe for your child to eat
Your child has had anaphylaxis related to nuts
Your child has nut allergy alongside eczema, asthma or other food allergies
You are unsure whether your child's nut allergy is genuine or pollen-related
You want to safely introduce nuts your child has been avoiding
Your child is starting school and you need a management plan
Book an AppointmentAllergy Testing Options
Common Questions

Frequently Asked Questions

Questions parents commonly ask about nut allergy in children — answered by Dr Mugilan Anandarajan, Consultant Paediatrician, Belfast.

No. Peanuts are legumes (related to peas, lentils and soy) and grow underground. Tree nuts (cashew, walnut, almond, hazelnut, pecan, pistachio, Brazil nut, macadamia) grow on trees. They are botanically unrelated, but many children are sensitised to both. Having peanut allergy does not automatically mean your child is allergic to tree nuts — and vice versa. Component-resolved diagnostics can clarify which nuts pose a genuine risk.
Not necessarily. A positive allergy test (skin prick test or specific IgE) indicates sensitisation — it does not always mean clinical allergy. Component-resolved diagnostics (CRD) can distinguish between genuine allergy (storage protein sensitisation, e.g. Ara h 2, Ana o 3) and cross-reactive sensitisation that is unlikely to cause systemic reactions (e.g. Ara h 8, Cor a 1). Unnecessary avoidance of multiple nuts can significantly impact diet and quality of life. Dr Anandarajan will interpret your child's results in full clinical context.
Dr Anandarajan uses skin prick testing (SPT), specific IgE blood tests (ImmunoCAP) and component-resolved diagnostics (CRD) to diagnose nut allergy. CRD is particularly valuable for nut allergy — it identifies the specific proteins a child is sensitised to, allowing precise risk stratification and avoiding unnecessary dietary restriction. Results are interpreted alongside your child's full clinical history.
Oral allergy syndrome (OAS), also called pollen-food syndrome, causes itching or tingling of the lips, mouth and throat within minutes of eating certain raw fruits, vegetables or nuts — most commonly hazelnut, apple, peach and celery in children sensitised to birch or grass pollen. Symptoms are usually mild and confined to the mouth. Cooked or processed forms of the food are usually tolerated. OAS is not the same as genuine IgE-mediated food allergy and does not typically cause anaphylaxis, though specialist assessment is recommended to confirm the diagnosis.
Nut allergy is generally more persistent than milk or egg allergy. Around 20% of children with peanut allergy develop natural tolerance over time. Tree nut allergy resolution rates vary by nut. Regular specialist review with repeat allergy testing every 2–3 years can identify children who have developed tolerance.
Use the prescribed adrenaline auto-injector (EpiPen or Jext) immediately at the first sign of anaphylaxis — do not wait to see if symptoms improve. Call 999 straight away. Lay your child flat with legs raised unless they have breathing difficulties. A second dose can be given after 5 minutes if symptoms do not improve. Always go to hospital after any use of an adrenaline auto-injector, even if symptoms resolve.
No. You can book directly at Kingsbridge Private Hospital or Ulster Independent Clinic without a GP referral. Dr Anandarajan sees children aged 0–16 with suspected or confirmed nut allergy.
Dr Anandarajan is recognised by all major UK private health insurers including Bupa, AXA Health, Aviva, Vitality, WPA and Benenden Health. Self-pay patients are also very welcome.

Have a question not answered here? Contact the clinic or call 028 9066 2878.

Areas We Serve

Nut Allergy Treatment for Families Across Northern Ireland

Families travel from across Northern Ireland to see Dr Anandarajan at Kingsbridge Private Hospital, Belfast. Easily accessible from the M1, M2 and A1 with free on-site parking. No GP referral required.

BelfastLisburnBangorNewtownardsHolywoodCarrickfergusAntrimCraigavonNewryArmaghBallymenaLondonderry / DerryOmaghEnniskillenDownpatrickNewtownabbeyNorth DownArds PeninsulaCounty DownCounty AntrimCounty ArmaghNorthern Ireland

Get expert help for Nut Allergy in Belfast

Dr Mugilan Anandarajan (FRCPCH) provides specialist paediatric allergy assessment at Kingsbridge Private Hospital and Ulster Independent Clinic. No GP referral required. Most major health insurers accepted.

Book a ConsultationAbout Our Specialist

Kingsbridge Private Hospital, 811–815 Lisburn Road, Belfast BT9 7GX

Why parents choose Belfast Allergy Clinic

  • Consultant Paediatrician (FRCPCH)
  • 25+ years clinical experience
  • Children aged 0–16 years
  • No GP referral required
  • Allergy testing available
  • Face-to-face and video consultations
  • Recognised by major insurers
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