Bowel cancer

Also called Colorectal cancer, Colon cancer, or Rectal cancer

Bowel cancer starts in the large bowel (colon) or the back passage (rectum). It is one of the most common cancers, mostly affecting people over 50. Many bowel cancers develop from small growths called polyps, which can be found and removed before they turn into cancer.

Last updated Nov 9, 2026

What it is

Risk is higher with age, a family history, long-standing inflammatory bowel disease, smoking, a diet high in red and processed meat, and being overweight.

Screening with a home stool test or colonoscopy can catch it early, when it is much easier to treat. Treatment may include surgery, chemotherapy, radiotherapy and targeted medicines.

Common signs

  • Blood in the stool
  • A change in bowel habit lasting more than a few weeks
  • Unexplained weight loss
  • Tiredness from low iron (anaemia)
  • Tummy pain or a lump

How it is usually diagnosed

  • Stool test (FIT)
  • Colonoscopy with biopsy
  • CT scan to check for spread
  • Blood tests including a full blood count

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Screening test results and dates
  • Colonoscopy and pathology reports
  • CT reports and staging
  • Treatment plans and the follow-up schedule

Questions to ask your doctor

  • What stage is it and what are my options?
  • Should my relatives be screened earlier?
  • How often will I need check-ups and scans?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Heavy bleeding from the bottom
  • Severe tummy pain with vomiting and being unable to pass stool or wind, which may be a blockage

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

Sources