Food allergy

How can I tell if someone is having an allergic reaction?

In a severe reaction, these symptoms get rapidly worse
and can lead to anaphylaxis.

Anaphylaxis is a medical emergency. Seek urgent medical treatment if the person has difficulty in swallowing or breathing or suddenly feels weak.

If the allergic reaction looks severe or likely to worsen:

Dial 999 or 112 to call an emergency ambulance.
Before the ambulance arrives, ask the customer's if they carry antihistamine or an auto-injector of adrenaline, and if so tell them to use it.
If they are not capable of giving themselves the injection, a trained person or first aider should give it. If no trained person is immediately available, you must give the injection yourself, following the customers instructions if possible.
If you are not sure how severe the allergic reaction is, give the adrenaline injection and dial 999 or 112. Adrenaline is safe to give and it's safer to act than wait.