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Why some rectal cancers need a permanent stoma | CION Cancer Clinics
A permanent stoma is needed when a rectal cancer sits so low that the anus and its ring of muscle have to be removed with it. With that ring gone there is nothing to join the bowel to and nothing to hold stool in, so the bowel is brought out through the belly for good. This page explains the reasons, how the decision is reached, and what you can ask your surgeon. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
MI
Medically reviewed by Dr. Mohammed ImaduddinConsultant Surgical Oncologist · MBBS, MS (General Surgery), MCh (Surgical Oncology) · last reviewed September 2026, next review due September 2027
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On this page
- Why do some rectal cancers need a permanent stoma?
- Four situations where the stoma has to be permanent
- A permanent stoma and a temporary one, compared
- How the decision is actually reached
- What the team weighs, and what this page cannot tell you
- Four things families tell us about stomas, and what is true
- Common questions about permanent stomas after rectal cancer
The short answer
Why do some rectal cancers need a permanent stoma?
A permanent stoma is needed when the cancer sits so low in the rectum that the anus and its ring of muscle have to be removed with it. Once that muscle ring is gone there is nothing left to join the bowel to, and nothing left to hold stool in, so the bowel is brought out through the belly instead.
Where the cancer sits decides it
The rectum is roughly the last hand's length of bowel. A cancer in its upper part can be cut out with a rim of healthy bowel below, and the two ends joined. A cancer in the lowest part leaves no healthy rim. Cutting below it means cutting into the muscle ring, and a ring that has been cut into cannot do its job.
Why the join is not the only question
Even where a join is possible, the surgeon has to ask whether it would work for you. A join very close to the anus, in someone whose muscle is already weak from age, childbirth or radiotherapy, can leave a person unable to hold stool at all. Many people, told that honestly, choose a stoma they can manage over a join they cannot.
A stoma from an APR is an "end colostomy". It cannot be reversed later, because the anus it would need has been removed.The usual reasons
Four situations where the stoma has to be permanent
Most people who need a permanent stoma fall into one of these. Your surgeon should be able to tell you which applies to you.
The cancer involves the muscle ring
If the MRI or the surgeon's examination shows the tumour growing into the sphincter, the ring must come out with it. Leaving any part of it behind would mean leaving cancer behind.
The cancer is too close to it
The tumour may stop short of the ring but sit so close that there is no room to cut below it with a clear edge. A clear edge, called a margin, is what the pathologist checks for. Without it the operation has not done its job.
The muscle is already weak
Some people already leak stool before the cancer is found, or have had radiotherapy that has stiffened the muscle. A low join in that setting often gives worse control than a stoma, and the surgeon will say so.
Often the case after
- Difficult childbirth in the past
- Earlier anal surgery
- Pelvic radiotherapy for another cancer
The cancer has come back
When a rectal cancer returns after an earlier operation or radiotherapy, the tissue is scarred and the safe route around it is narrower. A permanent stoma is more often the only sound option second time round.
Not sure whether this applies to you?
Ask an oncologistSide by side
A permanent stoma and a temporary one, compared
Permanent (end colostomy)
Temporary (loop ileostomy)
Made when the anus has been removed
Made to protect a new join while it heals
Usually on the left of the belly, from the colon
Usually on the right, from the small bowel
Output is formed stool, once or twice a day for many people
Output is loose and frequent, and needs more care with fluids
Stays for life; nothing to reverse
Closed in a second, smaller operation months later
The pathway
How the decision is actually reached
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MRI of the pelvis
This is the scan that matters. It shows how far the tumour is from the muscle ring and whether it has grown into it. Ask to see the pictures with the surgeon.
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Examination by the surgeon
A finger examination and often a short telescope test. The surgeon is feeling for where the tumour ends and how strong the ring is. It is uncomfortable and it is essential.
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Treatment before surgery
Many low rectal cancers have radiotherapy, with or without chemotherapy, first. This can shrink the tumour. The team then re-scans to see whether the picture has changed.
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Tumour board
Surgeons, oncologists and radiologists look at the scans together. The question on the table is whether the anus can be kept safely, and whether keeping it would leave you with control you can live with.
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The conversation with you
You are told what is recommended and why, and what the alternative would cost you. The stoma nurse then marks the site on your belly. Bring the family member who will help you at home.
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Being straight with you
What the team weighs, and what this page cannot tell you
This page cannot tell you whether your own cancer needs a permanent stoma. That answer sits in your MRI and the surgeon's examination, and it can change after radiotherapy. What this page can do is tell you what the team is weighing.
Clear edges come first
The surgeon's first duty is to remove all of the cancer with a rim of healthy tissue around it. Saving the anus is a close second, never a substitute. If the two pull in different directions, the team will choose the operation that removes the cancer fully, and should explain that choice plainly.
Control you can live with
A join that keeps the anus but leaves you rushing to the toilet many times a day, or leaking without warning, is not a better result for everyone. Ask the surgeon what bowel function would realistically look like after a low join, in your case, with your muscle, at your age. That is the question the decision often turns on.
What you can ask for
You can ask for the MRI to be shown to you, for a second opinion, and for time to meet the stoma nurse before you consent. None of those requests will offend a good surgeon.
Commonly believed
Four things families tell us about stomas, and what is true
"A permanent stoma means the cancer is very advanced."
It means the cancer is very low, which is a matter of position, not of stage. A small, early cancer sitting inside the anal canal can need a permanent stoma. A larger one higher up may not. The stoma tells you nothing about the outlook on its own.
"A better surgeon would have saved the anus."
Where the tumour involves the muscle ring, no surgeon can save it without leaving cancer behind. A second opinion is reasonable and welcome, but the answer usually comes from the MRI, not from who is holding the knife.
"With a stoma you cannot bathe, pray or go to work."
You can do all three. Modern bags are sealed and waterproof, and most people return to their usual work, travel and worship once the wound has healed. The stoma nurse will show you how before you leave hospital.
"We should refuse the stoma and ask for the join instead."
You can always ask, and the surgeon should explain what a join would mean in your case. But a join done against the surgeon's judgement can leave a person with no control at all, and that is often a harder life than a well-managed stoma.
Did you know
The spot for a stoma is marked on your skin by a stoma nurse before the operation, while you are sitting, standing and bending. A stoma placed in a skin fold or under a belt line is far harder to manage, so the marking is done with you awake and dressed as you normally would be, never on the operating table.
Questions we are asked
Common questions about permanent stomas after rectal cancer
Is there any chance the stoma can be reversed later?
Not after an abdominoperineal resection. A reversal needs an anus and muscle ring to join the bowel back to, and those have been removed. If your surgeon has said "permanent", that is what it means. If they have said "temporary" or "loop", a different operation is planned. Ask which before you consent.
Can radiotherapy shrink the tumour enough to avoid the stoma?
Sometimes. Radiotherapy before surgery can pull a tumour back from the muscle ring, and the team re-scans afterwards to check. It does not always change the plan, and a tumour that has grown into the ring usually still needs the ring removed.
How low does the cancer have to be for the stoma to be permanent?
There is no fixed measurement that settles it. What matters is whether a clear rim of healthy tissue can be cut below the tumour without damaging the muscle ring, and whether the ring would still work afterwards. Two cancers at the same height can get different answers.
Will I be able to feel or control anything from below?
No stool passes from below after an APR, because the anus has been closed with stitches. Some people feel an urge to open their bowels as if the rectum were still there. This is called phantom rectum sensation, it is common, and it usually fades with time.
Who will teach me to manage the bag?
A stoma nurse, starting before the operation and continuing after it. You will practise changing the bag yourself in hospital before you go home, and a family member is welcome to learn alongside you. Ask who to call if something goes wrong at home.
Does a permanent stoma mean I will also need chemotherapy?
Not on its own. Whether you need treatment after surgery depends on what the pathologist finds in the removed tissue, such as whether lymph glands were involved. The type of stoma does not decide that. The pathology report, usually back within a week or two, does.
Can I eat normally with a colostomy?
Most people return to their usual diet, including rice, dal and spiced food, within a few weeks. Some foods cause more wind or looser output and you will learn which ones for yourself. The dietitian and stoma nurse will guide you through the first weeks.
Are stoma bags covered by Aarogyasri or insurance?
The operation itself is usually covered under Aarogyasri, CGHS, ECHS, EHS and most cashless insurers when it is part of an approved cancer treatment plan. Ongoing bags and supplies are treated differently by different schemes. Call the helpline with your card details and we will check.
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Sources
- Cancer Research UK — Surgery for rectal cancer
- Macmillan Cancer Support — Abdominoperineal resection (APR)
- NHS — Colostomy
- American Cancer Society — Surgery for Rectal Cancer
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Abdominoperineal Resection: What Is RemovedEach part that comes out, and whyAPR vs Low Anterior Resection: How the Choice Is MadeThe operation that keeps the anus, and when it is possibleAccepting a Permanent ColostomyThe emotional side, for you and your familyStoma Siting Before APR: Why It Is MarkedHow the spot on your belly is chosenDeciding on Cancer SurgeryQuestions to ask before you consent
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Been told your stoma will be permanent?
Send us your MRI and biopsy reports or call the helpline. A surgical oncologist will explain why, what the alternative would mean, and what to ask before you consent. One helpline serves every CION centre.