If you don't already have one, a cannula will be inserted to administer intravenous sedation, which is the first stage of your anaesthetic.
Once it has taken effect, you'll be taken to the operating theatre.
The extent of the surgery will depend on the site of the tumour or damage. The usual approach is by an incision up to 40cm long down the centre of your abdomen.
The procedure involves the removal of the damaged part of the intestine and reconnecting or joining (anastomosis) the healthy parts of the intestine.
Sometimes, to allow the remaining bowel and anastomosis to heal, a stoma is created by bringing either the end of the bowel or a loop of healthy bowel to the surface of the abdomen.