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Preventive bowel removal in FAP: when is it planned? | CION Cancer Clinics
In classic FAP, removing the large bowel is usually planned in the late teens or early twenties, once polyps become too many to manage with a camera. The camera findings, not a fixed age, set the timing. This page explains how families reach that point, the three main operations, what follow-up continues, who surgery does not suit and what only your team can decide. 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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The short answer
When is the bowel removed in FAP?
In classic FAP, surgery to remove the large bowel is usually planned in the late teens or early twenties, once polyps are too many to manage with a camera. The exact timing depends on how many polyps there are, how large they have grown, and what is happening in the young person's life.
Why FAP leads to surgery
Familial adenomatous polyposis, or FAP, is an inherited condition caused by a change in the APC gene. It makes hundreds or thousands of polyps, small growths, form in the lining of the large bowel. Each polyp is harmless at first, but with so many, one of them turning into cancer becomes very likely over time. Removing the large bowel removes the place where those cancers would start.
Why timing is rarely an emergency
Children in FAP families usually start camera checks of the bowel in the early teens. Those checks show how quickly polyps are growing. This often gives the family time to plan surgery around school, exams or college, rather than rushing into it.
Involving the young person
The person having the operation is often a teenager or a young adult. Parents naturally want to decide, but the young person should hear the reasons directly, in plain words, and have time to ask questions without the family in the room. People who understand why an operation is being done usually cope better with the changes it brings.
Attenuated FAP is different
Some families have a milder form with fewer polyps that appear later. Polyps may be removed during colonoscopy for years, and surgery may come much later or not at all.
This page explains what teams usually weigh. It cannot tell you when your own surgery should happen.The pathway
How does a family move from diagnosis to surgery?
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The family gene change is found
Once an APC change is confirmed in a parent, children can be offered a blood test. Those who do not carry it usually need no special checks.
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Camera checks begin
Carrier children usually start regular colonoscopy or a shorter bowel camera test in the early teens. The team counts and samples the polyps each time.
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The polyps are followed over time
When polyps become very many, grow larger, or show worrying changes under the microscope, the team starts talking about surgery.
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Choosing the type of operation
You talk through the options below with a colorectal surgeon. The number of polyps in the rectum, the last part of the bowel, often decides which one fits.
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Planning around life
Surgery is timed, where it is safe, around exams, work and family plans. Say what matters to you so the team can plan with it.
Not sure whether this applies to you?
Ask an oncologistThe options
Which operations are used for FAP?
There are three main operations. Each keeps a different amount of the bowel and needs different follow-up.
Colectomy with ileorectal join
The large bowel is removed but the rectum is kept, and the small bowel is joined to it. Bowel habits are usually closer to normal, but the kept rectum can still grow polyps.
Suits people with
- Few polyps in the rectum
- Willingness to have rectal checks for life
Removal with an internal pouch
The large bowel and rectum are both removed. A pouch made from the small bowel is joined near the anus, so you still pass stools the usual way, more often than before.
The pouch still needs regular camera checks.Removal with a permanent stoma
The large bowel and rectum are removed and the small bowel opens onto the tummy, into a bag. It is used less often, usually when a pouch is not possible or not wanted, or when cancer has already been found low in the rectum.
Commonly believed
What do families often believe about FAP surgery?
"After this operation, he will have to wear a bag for life."
Most people with FAP today have an operation that avoids a permanent bag. A temporary stoma is sometimes used for a few weeks or months to let a join heal.
"She feels perfectly well, so there is no need to operate yet."
Polyps rarely cause symptoms until they are large or have turned into cancer. Feeling well does not tell you what the camera checks show. That is why the timing follows the checks.
"Once the bowel is removed, FAP is finished with."
FAP can also cause polyps in the duodenum, the first part of the small bowel just after the stomach, and in the stomach. Upper camera checks usually continue for life.
"Surgery will stop her from marrying or having children."
People with FAP marry and have children after surgery. Pelvic surgery can affect fertility in some women, which is one reason the type and timing of operation are discussed carefully.
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After bowel surgery: what cannot wait
In the days and weeks after the operation, go to the nearest emergency department the same day if there is severe or worsening tummy pain, a fever with shivering, repeated vomiting, a swollen tummy with no wind or stool passing, or a stoma that turns dark. Tell them about the operation. Do not wait for the next clinic appointment.
Being straight with you
Who is this not right for, and what can this page not tell you?
Early bowel removal is not usually suggested for young children, for people with only a few polyps that can be managed by colonoscopy, or on the basis of a family history without a confirmed gene change or clear findings on the camera checks.
A risk that surgery can raise
Some people with FAP develop desmoid tumours, firm growths in the tummy wall or inside the abdomen. They do not spread like cancer but can cause problems, and surgery can sometimes trigger them. A family history of desmoids can change the timing or type of operation.
Life after surgery takes adjusting to
Bowel habits change, and the first months can be tiring. Some people find the change in routine hard at college or work, especially with a pouch. It usually settles, but it helps to know this in advance and to plan time off. Tell the team if low mood or worry about the body builds up, because support is available.
What this page cannot do
It cannot tell you the right age or operation for you, predict how your bowel will work afterwards, or compare centres. Ask your centre how often its surgeons perform pouch surgery.
What to ask
Ask how many polyps are in the rectum. Ask which operation is being suggested, and why the others are less suitable. Ask what checks will continue afterwards.
Questions we are asked
Common questions about bowel removal in FAP
Is there a fixed age for surgery in FAP?
No. In classic FAP surgery is usually planned in the late teens or early twenties, but the camera findings decide the timing. Someone with many large polyps may need it sooner. Someone with attenuated FAP may need it much later, or never. Your team will explain the reasons behind their advice.
Can polyps simply be removed during colonoscopy instead?
When there are only a few polyps, as in some attenuated FAP, removing them during colonoscopy may work for years. In classic FAP there are usually far too many to remove one by one, which is why surgery becomes the safer plan.
How often will I need to open my bowels afterwards?
It depends on the operation. With the rectum kept, most people go a few times a day. With a pouch, trips are usually more frequent, including sometimes at night. Habits often settle over the first months. Your surgeon can explain what is typical for the operation suggested.
Can the operation be done by keyhole surgery?
Many centres do these operations through keyhole surgery, which can mean smaller scars. Some people need an open operation. Ask your centre which approach they would use for you, and why.
Will my children have FAP?
Each child of a parent with FAP has a chance of inheriting the gene change. A genetic counsellor can explain testing and when it is usually offered. Some cases of FAP are new in a family, with no parent affected, so testing is worth discussing even without a family history.
What checks continue after surgery?
If the rectum is kept, regular camera checks of it continue. A pouch also needs checking. Upper camera checks of the stomach and duodenum usually continue for life. Keep a written list of which checks are due and when.
Can I still eat normal food?
Most people return to ordinary food. Drinking enough water matters, because the large bowel normally absorbs fluid. Some foods may loosen stools, and people learn what suits them. A dietitian can help in the first months.
Is FAP surgery covered by insurance or schemes?
Cover varies, and approval often needs the camera reports, the gene result and a specialist's letter. Aarogyasri, CGHS, ECHS and EHS rules differ, as do cashless insurance policies. Call the helpline with your card or policy details and we will help you check.
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Sources
- Cancer.Net — Familial Adenomatous Polyposis
- National Cancer Institute — Genetics of Colorectal Cancer (PDQ)
- Cancer Research UK — Bowel cancer
- NHS — Bowel 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
Surveillance Instead of Preventive SurgeryWhat regular camera checks can and cannot doFollow-Up After Risk-Reducing SurgeryThe checks that continue after the operationComplications and Red FlagsWarning signs after surgery and what to doTalking to Your Family About Genetic RiskTelling children and relatives about FAP
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