Appendicitis is a painful swelling of the appendix. The appendix is a small, thin pouch about 5 to 10cm (2 to 4 inches) long. It's connected to the large intestine, where poo forms.
Appendicitis is inflammation of the appendix, a small pouch connected to your large intestine.
Appendicitis usually causes pain that starts in the middle of your tummy before moving towards the lower right side.
If you have appendicitis, you'll usually need surgery to remove your appendix as soon as possible.
Page last reviewed: 18/02/2019
Next review due: 18/02/2022