What should you know about anaphylaxis without swelling?

Visible puffiness of the lips, face or eyes is only one possible allergic feature. Anaphylaxis may instead cause wheezing, persistent coughing, noisy breathing, a tight throat, difficulty swallowing or a hoarse voice. Poor circulation can produce dizziness, confusion, a weak pulse, pale or clammy skin, fainting or collapse.

Some reactions involve widespread hives, flushing, repeated vomiting or severe abdominal cramping without obvious swelling. Skin findings may also be absent altogether. Consider the speed of change, the body systems involved and the person’s known triggers rather than using facial swelling as the deciding sign.

If anaphylaxis is suspected, give the person’s prescribed adrenaline auto-injector promptly according to its label and call emergency services. Do not wait for swelling to appear. Follow the individual allergy action plan, including its direction about a further device if severe symptoms continue.

Position the person flat with legs raised when tolerated. A person with difficult breathing may need to sit with legs extended, while someone unconscious who is breathing should lie on their side. Prevent standing or walking, remain nearby and watch for changes in voice, breathing, colour and alertness until the emergency team arrives.

Request emergency help immediately for throat tightness, trouble swallowing, voice change, difficult or noisy breathing, wheezing, blue or grey colour, confusion, fainting or collapse after a possible allergen exposure. Rapid symptoms across multiple body systems also need urgent action. Continue with emergency assessment if the person improves after adrenaline, since the reaction may return after an initial recovery.

Ask which warning signs in your history should lead directly to adrenaline, even when your face and lips look normal. Review possible triggers, the role of allergy testing, auto-injector storage and your technique. A written plan should also tell relatives, carers or colleagues how to respond if you develop voice changes, wheezing, faintness or confusion.