Insect Severity: Severe Rapid — often within minutes; can be life-threatening

Hornet sting allergy

Can be life-threatening
A hornet sting allergy can trigger anaphylaxis — a severe, whole-body reaction that can begin within minutes. Signs include swelling of the throat or tongue, difficulty breathing, a widespread rash, or feeling faint. Call emergency services immediately and use an adrenaline auto-injector (e.g. EpiPen) if one has been prescribed.
Written by the VitaWhat editorial team · Medically reviewed by Steve Davis · Last reviewed 19 July 2026 · Editorial policy

Allergy to hornet venom.

Common triggers

  • Hornet sting and products containing it

Symptoms

  • Pain, redness and swelling at the sting or bite
  • Widespread hives or itching
  • Swelling of the face, lips or throat
  • Wheezing or difficulty breathing
  • Anaphylaxis in severe cases

Avoidance & management

  • Avoid nests, hives and known habitats
  • Wear covering clothing and avoid strong scents outdoors
  • Use insect repellent and screens
  • Carry an adrenaline auto-injector if prescribed
  • Seek urgent help for a severe reaction

Sources & references

  1. NHS — Allergies
  2. ACAAI Allergic Conditions
  3. WHO / EAACI allergy resources

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.

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Bedbug biteBee stingFire ant stingFlea biteHorsefly biteMidge bite
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