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Bowel cancer

Bowel cancer means cancer that starts in the large bowel (colon) and the back passage (rectum). It is also known as colorectal cancer. Your treatment depends on where the cancer starts in your bowel.

The bowel is split into 2 parts - the small bowel and the large bowel. The large bowel includes the colon, the rectum and the bowel opening (anus). This section is about colon and rectal cancer. We have separate sections about anal cancer and small bowel cancer. 

Find out about anal cancer

What is bowel cancer?

Bowel cancer is also called colorectal cancer. It affects the large bowel, which is made up of the colon and rectum.

Symptoms of bowel cancer

Symptoms of bowel (colorectal) cancer can include bleeding from the back passage, blood in your poo or a change in your normal bowel habit.

Risks and causes of bowel cancer

The risk factors for bowel (colorectal) cancer include your age, family history, lifestyle factors and other medical conditions.

Getting diagnosed with bowel cancer

You usually start by seeing your GP and they might refer you to a specialist and organise tests. Get information on what happens, and read about screening for bowel cancer.

Stages, types and grades of bowel cancer

The stage of a cancer tells you how far it has grown through the bowel wall and whether it has spread to nearby lymph nodes or other organs. It helps your doctor to know which treatment you need.

Treatment for bowel (colorectal) cancer

Treatment depends on whether you have colon or rectal cancer, as well as your cancer stage. You might have surgery, radiotherapy or chemotherapy or a combination of these.

Last reviewed: 27 Jun 2025

Next review due: 27 Jun 2028

Page Credits: 

This section has been written, reviewed and updated by Cancer Research UK’s Patient Information Web Team. Thanks to the expert medical professionals and people affected by cancer who have helped to review this information.

  • Mr Ben Griffiths (Consultant Colorectal Surgeon)

  • Dr Mike Braun (Consultant Medical Oncologist)

  • Lynne Higgins (Colorectal Clinical Nurse Specialist)

  • Anna Boyles for the stoma information (Lead Stoma Nurse)

  • Our lay reviewers

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