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What an anastomosis is, and why the join matters | CION Cancer Clinics
An anastomosis is the join. After a piece of bowel is removed, the surgeon connects the two healthy ends back together with stitches or staples so stool can pass as before. It is the part of a colectomy the surgeon thinks about hardest, because it has to heal on its own inside the belly. This page explains how the join is made, how it heals, the warning signs of a leak, and when a surgeon chooses not to join straight away. 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
- What does anastomosis mean on a surgery report?
- How is the bowel actually joined?
- How does the join heal in the weeks after surgery?
- Four things families worry about with the join
- Words about the join you will see, in plain language
- When is the bowel not joined straight away?
- Common questions about a bowel anastomosis
The short answer
What does anastomosis mean on a surgery report?
An anastomosis is the join. After the surgeon removes a piece of bowel, the two healthy ends are connected back together so that food and stool can pass through as before. The word is pronounced a-nas-to-MO-sis, and on your report it simply marks the place where the bowel was reconnected.
Why the join is the most important part of the operation
Removing the tumour is the part families think about. Surgeons think just as hard about the join, because it has to heal on its own, inside the belly, while stool keeps moving through it. Almost everything that happens in the first week after a colectomy is about giving that join the conditions it needs: good blood supply, no tension, and no infection.
What an anastomosis is not
It is not a stoma. A stoma is the opposite choice: instead of joining the ends, the surgeon brings one end out through the skin into a bag. Some people have both, a join deeper inside and a temporary stoma above it to protect the join while it heals. Your operation note will say which you have.
If your report says "primary anastomosis", it means the bowel was joined straight away, during the same operation.How it is done
How is the bowel actually joined?
Two decisions are made on the table: what to join with, and in what shape. Neither is better across the board. Your surgeon chooses to fit the bowel in front of them.
Hand-sewn
The surgeon stitches the two ends together with fine thread, in one or two layers. It takes longer, and it is the method every bowel surgeon learns first.
Often chosen when
- The bowel is swollen or thickened
- The two ends are different sizes
Stapled
A surgical stapler places rows of tiny titanium staples across the join in one movement. The staples stay in for life and do not set off airport scanners or cause trouble with MRI.
Often chosen when
- The join sits deep in the pelvis
- Keyhole surgery is being done
End to end
The two cut ends are lined up and joined mouth to mouth. It gives the most natural shape and is common when both ends are of similar width.
Side to side
The ends are closed off and the bowel is joined along its sides instead. It gives a wider opening, and is the usual choice when small bowel is joined to colon after a right-sided operation.
Your report may call this an ileocolic anastomosis.Not sure whether this applies to you?
Ask an oncologistHealing
How does the join heal in the weeks after surgery?
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The first days: the bowel goes quiet
After being handled, the bowel stops moving for a while. You will not pass wind or stool at first. This is expected, and the team is watching for it to restart, not worrying that it has.
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Wind returns
Passing wind is the first sign the join is open and the bowel is working. Nurses will ask about it every day, and it is worth telling them rather than being embarrassed.
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The first meals
Most teams now start sips and soft food early rather than waiting for days. Eating does not strain the join. It helps the bowel wake up.
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The fragile window closes
The join is at its weakest in the first week or so, while the two edges are held by stitches or staples alone. After that, the body's own healing tissue takes over the strength.
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Scar tissue matures
Over the following months the join becomes a firm ring of scar. Occasionally it narrows and needs stretching, which is why your team asks about your bowel habit at follow-up.
!
The one thing that cannot wait after a bowel join
If, in the days after going home, the belly pain gets worse rather than better, or there is a fever, a fast heartbeat, a swollen tight belly, or you feel suddenly much more unwell, contact the surgical team the same day or go to the nearest emergency department and say you have had bowel surgery. These can be signs of a leak at the join. Do not wait for the next appointment, and do not treat it as an ordinary stomach upset.
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Commonly believed
Four things families worry about with the join
"Stapled joins are weaker than stitched ones."
Large studies comparing the two have not shown that one heals better than the other for most colon joins. Surgeons choose on the basis of position, bowel condition and access. What matters far more is the blood supply to the two ends and whether the join is under tension.
"If they gave him a bag, the join must have failed."
A temporary stoma made during the same operation is usually a planned protection for a join that sits low or was made in difficult conditions. It diverts stool away while the join heals. It is a precaution, not a sign that something went wrong.
"Eating too early will burst the join."
Food does not put pressure on the join in the way people imagine. Most surgical teams now encourage early eating because it helps the bowel start moving again and shortens recovery. Follow the diet your own team sets, which may be softer at first.
"The join can come apart years later."
Once healed, the join is a ring of scar as strong as the bowel around it. Leaks happen in the early weeks, not years on. A join can narrow over time, which causes cramping or constipation, and that is treatable.
On your report
Words about the join you will see, in plain language
- Ileocolic anastomosis
- Small bowel joined to colon. The usual join after a right hemicolectomy.
- Colorectal anastomosis
- Colon joined to rectum, after a sigmoid or left-sided operation. The lower it sits, the more carefully it is watched.
- Anastomotic leak
- Bowel contents escaping through a gap in the join. The complication surgeons watch for hardest in the first week.
- Defunctioning or diverting stoma
- A temporary stoma made above the join so stool bypasses it while it heals. Usually reversed months later.
- Leak test
- Air or dye passed into the bowel during surgery to check the join is sealed before the belly is closed.
- Stricture
- A narrowing at the join caused by scar tissue. It can be stretched through a colonoscope if it causes symptoms.
Being straight with you
When is the bowel not joined straight away?
Not every colectomy ends with a join. A surgeon may decide against one, or protect one with a temporary stoma, when the conditions for healing are poor. That is a judgement made on the table, and usually the safer choice.
Who is less likely to get an immediate join
Emergency operations for a blocked or burst bowel, where the bowel is swollen and unprepared. Patients who are very unwell, poorly nourished, on long-term steroids, or who have had radiotherapy to the area. Joins very low in the pelvis. In these situations a join is more likely to leak, and a stoma is how the surgeon lowers that chance.
What this page cannot tell you
It cannot tell you whether your join will heal, or whether you will need a stoma. That depends on where the tumour sits, your general health and what the surgeon finds. Ask before the operation whether a stoma is possible, and whether it would be temporary. The stoma page and the leak page take both questions further.
If you are reading an operation note you do not understand, call the helpline and someone will go through it with you, in Telugu if you prefer.Questions we are asked
Common questions about a bowel anastomosis
How long does the join take to heal?
The join is at its weakest in the first week or so, while stitches or staples are holding it. After that the body's own healing tissue takes over. Full maturing of the scar takes months, but you will not feel that happening.
Will I feel the staples or stitches inside?
No. The join sits deep inside the belly and has no feeling of its own. Staples are tiny and stay in for life. Any pain in the first weeks is from the wounds and the bowel waking up, not from the join.
Can I eat normally with a join in my bowel?
Eventually yes, for most people. In the early weeks your team may ask you to keep to softer, lower-fibre food while the bowel settles. After that there is usually no food the join cannot handle. What changes is bowel habit, which may be looser for a while.
What does a leak feel like?
Usually belly pain that gets worse instead of better, often with fever, a fast heartbeat and feeling suddenly much more unwell. Sometimes the first sign is simply not getting better as expected. It needs same-day attention from the surgical team.
Why did my father get a join but my neighbour got a bag?
Because the decision depends on where the tumour sat, whether the operation was planned or an emergency, and how well the person was on the day. Two people with the same diagnosis can have different operations for good reasons.
Is a join done in keyhole surgery as strong as in open surgery?
Yes. The join is made the same way, usually with a stapler, whichever route the surgeon used to reach the bowel. Keyhole changes how the surgeon gets in, not how the two ends are put together.
Will the join narrow later?
It can, in a minority of people, because scar tissue tightens as it matures. The signs are cramping, bloating and harder-to-pass motions some months after surgery. It is usually treated by stretching the narrow spot through a colonoscope.
Does a temporary stoma always get reversed?
Usually, once the join has healed and any chemotherapy is finished, but not always. Reversal is a second, smaller operation and needs you to be fit for it. The stoma reversal page covers timing and what to expect.
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Sources
- Cancer Research UK — Surgery for bowel cancer
- Macmillan Cancer Support — Bowel cancer
- National Cancer Institute — Colon Cancer Treatment (PDQ) - Patient Version
- American Cancer Society — Surgery for Colon Cancer
- NHS — Bowel cancer - Treatment
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
Anastomotic Leak After ColectomyWhat happens if the join does not hold, and how it is treatedWill I Wake Up With a Stoma?When a surgeon protects or replaces the join with a stomaStoma Reversal: When and HowThe second operation that reconnects a temporary stomaHow Much Bowel Is Removed and WhyWhat comes out before the join is madeComplications and Red FlagsEvery warning sign after cancer surgery in one place
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Send it to us or call the helpline. A surgical oncologist will explain what was joined, what was removed and what to watch for. One helpline serves every CION centre.