After bowel (colorectal) cancer treatment
Surveillance colonoscopy, CEA and CT scans, living with a changed bowel or a stoma, and the treatable causes of diarrhoea that are frequently missed.
4 min read · Part of Cancer Types
Written by The LifeAfterward editorial team from the sources listed at the end of this page.
Not individually reviewed by a clinician. This page is written from published clinical guidance, listed in full at the end, and is general information rather than medical advice — your own team knows your case. See our editorial standards.
Last checked against its sources · Last updated · Next check due
In short
- Follow-up typically combines clinic review, CEA blood tests, CT scans in the early years and surveillance colonoscopy at intervals.
- Changed bowel function after rectal surgery is very common and has a name — low anterior resection syndrome — and specific treatments.
- Persistent diarrhoea after treatment often has a treatable cause, such as bile acid malabsorption, that is easily missed.
- Oxaliplatin-related neuropathy can persist and needs its own management.
What this means
Bowel cancer follow-up is more test-heavy than some other cancers, because there is evidence that finding recurrence early can allow further curative treatment. The daily reality afterwards, though, is usually about bowel function — and that is an area where people quietly adapt their whole lives around a problem that could be treated.
What follow-up usually looks like
- Clinic review, often three to six monthly in the first two to three years.
- CEA blood test at intervals — interpreted as a trend, and affected by smoking and some benign conditions.
- CT scans of chest, abdomen and pelvis in the first few years.
- Surveillance colonoscopy — commonly at one year after surgery, then at intervals depending on findings.
- Ongoing stoma care, or review of bowel function after reversal.
Bowel function afterwards
- Low anterior resection syndrome (LARS)
- Urgency, frequency, fragmentation (going repeatedly in a short period), clustering and incontinence after rectal surgery. Very common, often improves over one to two years, and manageable with diet, medication, pelvic floor physiotherapy and specialist nursing.
- Bile acid malabsorption
- A frequent and frequently missed cause of watery diarrhoea after right-sided bowel surgery or pelvic radiotherapy. It responds well to specific medication. Ask about it by name.
- Radiation proctitis
- Bleeding, urgency or mucus after pelvic radiotherapy, sometimes appearing months later. Treatable — report it rather than assuming it is haemorrhoids.
- Stoma
- Whether temporary or permanent, ongoing access to a stoma nurse matters. Skin problems, leaks, hernias and blockages all have solutions.
- Dietary changes
- Many people find specific foods now cause urgency or wind. A dietitian is far more useful than trial and error, particularly after significant bowel resection.
Other effects to watch
- Neuropathy after oxaliplatin, including cold sensitivity — see neuropathy.
- Fatigue, which is common and improves slowly.
- Sexual and urinary difficulties after pelvic surgery or radiotherapy — common and under-reported.
- Nutritional issues after extensive resection, including vitamin B12 and iron.
- Family risk: ask whether your diagnosis warrants genetic assessment, particularly if you were diagnosed young or have a family history.
What to report
- A persistent change in bowel habit beyond your new normal, or new rectal bleeding.
- Abdominal pain, bloating or vomiting — particularly if it comes and goes in waves.
- Unexplained weight loss or persistent fatigue.
- A lump or swelling around a stoma or scar.
What to ask your healthcare team
- What is my follow-up schedule — scans, CEA and colonoscopy?
- Is my bowel function what you would expect, and can I be referred for help with it?
- Could bile acid malabsorption explain my diarrhoea?
- Can I see a dietitian and, if I have a stoma, a stoma nurse?
- Do I have persistent neuropathy that needs treatment?
- Should my family be screened, or should I have genetic testing?
Save questions to My Journey so you have them in the room, or use a ready-made list.
When to seek medical advice
Contact your healthcare team if you have:
- New rectal bleeding, or a persistent change in bowel habit.
- Diarrhoea that is not controlled — it usually has a treatable cause.
- Unexplained weight loss or worsening fatigue.
- Stoma problems: leaks, skin breakdown, a bulge or reduced output.
Get emergency help the same day if you have:
- Severe abdominal pain with vomiting, a distended abdomen, or no stoma output or bowel movement for a prolonged period — possible obstruction, needs emergency assessment.
- Heavy rectal bleeding, or fever with abdominal pain.
If you are worried and unsure, contact your team anyway — they would far rather hear from you unnecessarily than late. What to do in an emergency.
Common questions
Is it normal to have bowel problems years after bowel cancer surgery?
Changed bowel function is common, particularly after rectal surgery, and often improves over one to two years. Persistent problems usually have a specific and treatable cause — including low anterior resection syndrome, bile acid malabsorption or radiation proctitis — so they are worth raising rather than adapting around.
How often will I have colonoscopy after bowel cancer?
Commonly at one year after surgery, then at intervals determined by what is found and your risk. Your team should give you the schedule in writing along with who arranges it.
Sources
This page was written from the guidance below and checked against it on . Links are re-checked at each review — see our editorial standards.
- ASCO (Cancer.Net). Survivorship
- National Comprehensive Cancer Network. NCCN Guidelines for Patients
- National Cancer Institute (US). Follow-up medical care after cancer treatment
- Journal of Clinical Oncology (2020). Prevention and Management of Chemotherapy-Induced Peripheral Neuropathy in Survivors of Adult Cancers: ASCO Guideline Update (Loprinzi et al.)
- National Cancer Institute (US). Late effects of cancer treatment