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Colorectal (Bowel) Cancer in Singapore: Symptoms, Screening & Treatment

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Colorectal (Bowel) Cancer in Singapore

Written & reviewed by the BestDoctors.sg editorial team · Last updated 2 Jul 2026 · General information, not medical advice

Quick answer. Colorectal (bowel) cancer is among the most common cancers in Singapore, ranking as the top cancer overall and the second most common in both men and women. It often grows silently from polyps over years, so screening matters. From age 50, average-risk adults are advised to do a yearly FIT (faecal immunochemical test, a simple stool test) or a colonoscopy every 5-10 years. See a doctor promptly about a persistent change in bowel habit, blood in the stool, unexplained weight loss, or ongoing abdominal pain. Found early, colorectal cancer is highly treatable, which is why screening can save lives.

Colorectal cancer, also called bowel or colon cancer, affects the large intestine (colon) and rectum. It is one of Singapore’s most common cancers, and the good news is that it is also one of the most preventable and treatable when caught early. Most cases develop slowly over years from small growths called polyps, giving a real window to detect and remove them before they turn cancerous.

This guide explains who is at risk, the symptoms worth acting on, and how Singapore’s screening programme works. It is for general education and does not replace advice from your doctor. If you notice blood in your stool or a lasting change in bowel habits, please arrange a medical review rather than waiting.

At a glance

Colorectal cancer at a glance (Singapore)
Aspect Detail Why it matters
How common Among the top cancers in Singapore; ~2nd most common in both men and women Affects many families, but is largely screenable
Main screening (avg risk) Yearly FIT stool test from age 50, or colonoscopy every 5-10 years Detects cancer early or removes pre-cancerous polyps
Key red flags Blood in stool, change in bowel habit, weight loss, abdominal pain Prompt review allows earlier diagnosis
Outlook Highly treatable when found at an early stage Early detection strongly improves outcomes

How common is colorectal cancer in Singapore?

Colorectal cancer is consistently among Singapore’s most frequently diagnosed cancers. When both sexes are combined it ranks at or near the top, and within each sex it is the second most common cancer (after prostate cancer in men and breast cancer in women), according to the Singapore Cancer Registry and the National Cancer Centre Singapore (NCCS). It chiefly affects people over 50, though doctors are seeing more cases in younger adults too. The Chinese community in Singapore has a somewhat higher risk than other ethnic groups.

Risk factors you should know

Some risks cannot be changed, while others relate to lifestyle:

  • Age over 50 (the main risk factor)
  • Family history of colorectal cancer or polyps
  • A personal history of polyps, or inflammatory bowel disease (ulcerative colitis, Crohn’s disease)
  • Diets high in red or processed meat and low in fruit, vegetables and fibre
  • Smoking, heavy alcohol use, obesity and physical inactivity

Having a risk factor does not mean you will develop cancer, and many people with bowel cancer have no obvious risk factors. This is exactly why routine screening matters.

Symptoms and red flags: when to see a doctor

Early colorectal cancer often causes no symptoms at all, which is why screening is so valuable. When symptoms do appear, please see a doctor if you have:

  • Blood in your stool or bleeding from the back passage (do not assume it is just piles)
  • A persistent change in bowel habit (diarrhoea, constipation, or thinner stools lasting more than a couple of weeks)
  • Unexplained weight loss
  • Persistent abdominal pain, bloating or cramping
  • A feeling that the bowel does not empty fully, or unexplained tiredness/anaemia

These symptoms have many causes, most of them not cancer, but they should always be checked. Getting reviewed early is reassuring and, if needed, allows treatment to start sooner.

Screening: FIT and colonoscopy

For average-risk adults from age 50, Singapore recommends either:

  • FIT (faecal immunochemical test) once a year – a simple, do-it-at-home stool test that checks for hidden blood. FIT kits are available through Healthier SG providers and polyclinics, and the cost is subsidised under national screening efforts.
  • Colonoscopy every 5-10 years – the most thorough test, allowing the doctor to view the entire large bowel and remove polyps during the same procedure.

If a FIT result is positive, a follow-up colonoscopy is advised to find the cause. People with a strong family history or other risk factors may need to start earlier or be screened more often – discuss this with your doctor. For more on the procedure, see our colonoscopy guide.

Stages and treatment overview

Colorectal cancer is staged from I (early, confined to the bowel wall) to IV (spread to distant organs). Treatment is tailored to the stage and the individual, and is planned by a multidisciplinary team:

  • Surgery to remove the affected section of bowel is the mainstay for most localised cancers; very early cancers may be removed during colonoscopy.
  • Chemotherapy may be used after surgery (or before) to lower the risk of recurrence.
  • Radiotherapy is used mainly for rectal cancer.
  • Targeted therapy and immunotherapy are options for some advanced cancers, depending on tumour characteristics.

Outcomes are strongly linked to stage at diagnosis: early-stage colorectal cancer is highly treatable, which underlines the value of screening.

Can colorectal cancer be prevented?

You cannot remove every risk, but you can meaningfully lower it:

  • Get screened on schedule – this is the single most effective step, because removing polyps can stop cancer before it starts
  • Eat more fruit, vegetables, wholegrains and fibre; limit red and processed meat
  • Stay physically active and maintain a healthy weight
  • Limit alcohol and avoid smoking
  • Know your family history and tell your doctor

These habits also protect your heart and overall health, so they are worthwhile regardless of cancer risk.

Related guides

Sources

Last updated 22 June 2026. Prices are typical market ranges gathered from the cited sources and vary by clinic, doctor and individual case — they are not quotes. This guide is general information, not medical advice; always consult a qualified, MOH-accredited doctor before any treatment.

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Frequently asked questions

At what age should I start colorectal cancer screening in Singapore?

Average-risk adults are advised to begin screening from age 50, using a yearly FIT stool test or a colonoscopy every 5-10 years. If you have a family history of colorectal cancer or polyps, or other risk factors, your doctor may recommend starting earlier or screening more frequently.

Is blood in my stool always cancer?

No. Most rectal bleeding is caused by benign conditions such as haemorrhoids (piles) or anal fissures. However, blood in the stool can also be an early sign of colorectal cancer, so it should never be ignored. Please see a doctor to have it assessed rather than assuming the cause.

What is the difference between FIT and colonoscopy?

FIT is a simple home stool test that checks for hidden blood and is done yearly; it is convenient but does not directly see the bowel. Colonoscopy is a camera examination of the entire large bowel that can also remove polyps, done every 5-10 years. A positive FIT result should be followed up with a colonoscopy.

Does colorectal cancer run in families?

It can. Having a first-degree relative (parent, sibling or child) with colorectal cancer or polyps raises your risk, and some families carry inherited conditions that increase risk further. Tell your doctor about your family history, as you may benefit from earlier or more frequent screening.

Is colorectal cancer curable?

When found early, colorectal cancer is highly treatable and often curable, frequently with surgery alone. Outcomes are closely linked to the stage at diagnosis, which is why screening and acting on symptoms early matter so much. Even at later stages, treatments have improved and can extend life and quality of life.