Anaphylaxis is a severe and potentially life-threatening reaction to a trigger such as an allergy.
It's also known as anaphylactic shock.
This page covers:
Anaphylaxis usually develops suddenlyand 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. Itcan be very serious if not treated quickly.
If someone has symptoms of anaphylaxis, you should:
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.
Thisis often something you're allergic to, but isn't always.
Common anaphylaxis triggers include:
In some cases, there's no obvious trigger. This isknown asidiopathic 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:
Find out about the symptoms of anaphylaxis, how to treat it, why it happens and how to prevent it.
The symptoms include: feeling lightheadedness, breathing difficulties such as fast, shallow breathing, wheezing, a fast heartbeat, clammy skin, confusion and anxiety, collapsing or losing consciousness.
Find out what to do if you think you or someone else is experiencing anaphylaxis.