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Complications - Appendicitis

If your appendicitis is not treated, your appendix can burst. If your appendix bursts, it releases bacteria inside your body. This can cause life-threatening infections.

Emergency action required: Call 112 or 999 or go to your nearest emergency department now if:

  • you have tummy pain that suddenly gets much worse and spreads across your stomach

Peritonitis

If your appendix bursts, it can cause peritonitis. This is when the lining of your tummy (peritoneum) becomes infected.

Symptoms of peritonitis can include:

If peritonitis is not treated, it can cause long-term problems and may even be fatal. Treatment is antibiotics and surgery to remove your appendix.

Abscesses

If your appendix bursts, an abscess may form around it. This is a painful collection of pus. It happens when your body tries to fight the infection.

Your doctor may treat the abscess with antibiotics. But they may need to drain the pus.

During the procedure, your doctor:

  1. Gives you a local anesthetic so you do not feel anything in the area.
  2. Inserts a needle through your skin.
  3. Inserts a drain to remove the pus.

If your doctor finds an abscess during surgery, the area is washed out. You will be given a course of antibiotics.

Abscess

Adhesions

You can get abdominal adhesions after surgery on your appendix. This is when scar tissue forms between your organs and tissues in your tummy (abdomen). The organs and tissues can stick together.

Most adhesions are painless and do not cause complications. They usually begin to form in the first few days after your surgery. But you may not have symptoms for months or years.

Treatment can depend on where the adhesion is and how it affects you. Adhesions usually improve without surgery.


Content supplied by the NHS and adapted for Ireland by the HSE

Page last reviewed: 23 June 2026
Next review due: 23 June 2029

This project has received funding from the Government of Ireland’s Sláintecare Integration Fund 2019 under Grant Agreement Number 123.