Skip to main content
Anaphylaxis

Anaphylaxis is a severe and potentially life-threatening reaction to a trigger, such as an allergy.

Symptoms of anaphylaxis include feeling faint, finding it hard to breathe, a fast heartbeat and feeling anxious.

Anaphylaxis needs to be treated in hospital at soon as possible. Use an adrenaline injector if the person has one and call 999 for an ambulance.

Anaphylaxis is usually caused by an allergic reaction. Common triggers include foods, medicines and insect stings.

You can help prevent anaphylaxis by avoiding any triggers you have and carrying your adrenaline injector at all times.

Read more on the NHS website.

Symptoms of anaphylaxis include feeling faint, finding it hard to breathe, a fast heartbeat and feeling anxious.

Symptoms of anaphylaxis

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.

Read more on the NHS website.

Anaphylaxis needs to be treated in hospital at soon as possible. Use an adrenaline injector if the person has one and call 999 for an ambulance.

Medical treatments

Anaphylaxis is a medical emergency. It can be very serious if not treated quickly.

If someone has symptoms of anaphylaxis, you should:

  1. Use an adrenaline auto-injector if the person has one – but make sure you know how to use it correctly first.
  2. Call 999 for an ambulance immediately (even if they start to feel better) – mention that you think the person has anaphylaxis.
  3. Remove any trigger if possible – for example, carefully remove any stinger stuck in the skin.
  4. Lie the person down flat – unless they're unconscious, pregnant or having breathing difficulties.
  5. Give another injection after 5 to 15 minutes if the symptoms do not improve and a second auto-injector is available.

If you're having an anaphylactic reaction, you can follow these steps yourself if you feel able to.

Read more on the NHS website.

You can help prevent anaphylaxis by avoiding any triggers you have and carrying your adrenaline injector at all times.

Read more on the NHS website.

Anaphylaxis is usually caused by an allergic reaction. Common triggers include foods, medicines and insect stings.

Read more on the NHS website.