Anaphylaxis is a severe, and sometimes fatal, allergic reaction characterised by low blood pressure (hypotension), localised swelling of the skin and mucous membranes (angio-oedema), narrowing of the airways in the lungs, itching, vomiting and abdominal pain. Common causes include an allergy to drugs (such as penicillin), food allergies (eg peanuts) and bee stings.

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