Airborne anaphylaxis: risks, warning signs and action

Use prescribed adrenaline at the first signs of anaphylaxis, call local emergency services and do not wait to see whether symptoms settle.

An airborne trigger is a protein carried in droplets, dust, steam or cooking particles rather than merely a smell. Odours can cause nausea, anxiety or irritation, but an allergic reaction requires exposure to allergen protein. Reactions from inhalation are possible, especially where food or another allergen is being cooked, processed or dispersed.

Anaphylaxis can present with throat tightness, hoarse voice, difficult breathing, persistent cough, wheezing, swelling of the tongue or lips, widespread hives, dizziness, collapse or sudden severe stomach symptoms. Skin changes may be absent. Symptoms affecting breathing or circulation make the reaction an emergency.

Move away from the airborne source without delaying treatment. Use the adrenaline auto-injector exactly as shown in the person’s action plan, then call emergency services and state that anaphylaxis is suspected. Keep the person lying flat with legs raised when possible; if breathing is difficult, allow them to sit with legs extended. Do not let them stand or walk suddenly.

If symptoms do not improve or return, follow the action plan for another prescribed auto-injector. Someone should stay with the person, note when adrenaline was given and hand any used device to the emergency team. Antihistamines do not treat dangerous breathing or circulation problems and must not delay adrenaline.

Call emergency services immediately for trouble breathing, throat or tongue swelling, a hoarse voice, collapse, confusion, blue or grey lips, or rapidly worsening symptoms involving more than one body system. Emergency assessment is still needed after adrenaline works because symptoms can recur and further treatment or observation may be necessary.

A mild isolated symptom after possible exposure still deserves prompt medical advice when the person has a history of severe reactions. Follow their written allergy plan, keep prescribed medication nearby and watch closely for progression while arranging care.

Ask which airborne situations are relevant to your confirmed allergen, what early symptoms belong in your action plan, how to store and use your auto-injector, and whether family, school or workplace staff need training. Clarify how to handle restaurants, shared kitchens, aircraft travel and workplaces where allergen particles may become airborne.

Discuss whether allergy testing can identify the trigger and whether asthma control changes your emergency plan. Bring details of the exposure, timing, symptoms and treatment to the appointment rather than testing avoidance strategies on your own.