Illness name: anaphylaxis
Description:
Anaphylaxis is a severe and potentially life-threatening reaction to a trigger such as an allergy.
Anaphylaxis usually develops suddenly and gets worse very quickly.
The symptoms include:
There may also be other
allergy symptoms
, including an itchy, raised rash
(hives)
; feeling or being sick; swelling
(angioedema)
or
stomach pain
.
Anaphylaxis is a medical emergency. It can be very serious if not treated quickly.
If someone has symptoms of anaphylaxis:
If you're having an anaphylactic reaction, you can follow these steps yourself if you feel able to.
Read about
how to treat anaphylaxis
for more advice about using auto-injectors and correct positioning.
Anaphylaxis is the result of the immune system, the body's natural defence system, overreacting to a trigger.
This is often something you're allergic to, but not always.
Common anaphylaxis triggers include:
In some cases, there's no obvious trigger. This is known as idiopathic anaphylaxis.
If you have a serious allergy or have experienced anaphylaxis before, it's important to try to prevent future episodes.
The following can help reduce your risk:
Read more about preventing anaphylaxis
Page last reviewed: 29 November 2019
Overview
-
Anaphylaxis
Symptoms of anaphylaxis
What to do if someone has anaphylaxis
Triggers of anaphylaxis
Preventing anaphylaxis
Next review due: 29 November 2022