What I Wish I Knew Before J Pouch Surgery

The things people most often wish they had known before j pouch surgery are not about the operating theatre. They are that it is usually two or three separate operations spread over months, that each stage feels different, that pouchitis is common rather than a sign something went wrong, that fertility and the surgeon's experience are questions to raise early, and that the "95% success rate" quoted everywhere measures something narrower than it sounds. Most people with a pouch are glad they had it. The regret, when it comes, is usually about surprises. If you have a pouch, pregnancy with a j pouch covers delivery and pouch function.

This article is built from the questions people ask in r/UlcerativeColitis, r/IBD and r/ostomy before their surgery, matched against the outcome research. It is a decision-and-preparation guide for the months before surgery, not a recovery timeline and not a full pouch-versus-bag comparison. One honest note on demand: the exact phrase "what I wish I knew before j pouch surgery" is a recurring Reddit thread title with dozens of replies each time, but Google's autocomplete does not suggest it. People ask it in communities, not search boxes, which is part of why the pages that rank for it are mostly forums.

Did you know it is usually two or three operations?

Most people having a j pouch for ulcerative colitis go through two or three operations, often over several months, and the stage plan shapes your whole year. "Did you understand it was two or three separate operations?" comes up again and again in pre-surgery threads, often from people who learned it from other patients rather than from their first consultation.

In one r/UlcerativeColitis thread from someone torn between a pouch and a permanent bag, a reply summarised it neatly: usually three surgeries over roughly eight to ten months, and at the end of step one you have an end ileostomy that you can "try before you buy" (r/UlcerativeColitis thread). That reframing, that the first operation leaves you with a decision rather than a commitment, is the single most useful thing people say they wish they had heard earlier.

Here is how the main routes differ. The names vary between hospitals, so ask your surgeon which one they mean.

Why not just do it all at once? Because many people reach surgery unwell, on high-dose steroids or after several advanced therapies, and building a pouch in that state carries more risk. Taking the colon out first lets you recover, come off some medicines and build strength before the more delicate pelvic part of the operation. Previous medicine exposure is one of the factors that shifts which route looks safest in the studies (Luo 2020).

The evidence on which route is safest is genuinely mixed, and the studies are comparing different things. A single-centre study of 460 people found the modified two-stage approach had a much lower rate of leaks from the pouch join than the classic two-stage approach, 4.6% against 15.7%, even though the modified group had been sicker at presentation (Zittan 2016). A 2026 study across six European centres compared modified two-stage with three-stage and found the opposite direction for leaks: 18% after modified two-stage against 5% after three-stage (Moojen 2026). Those two findings are not actually in conflict. Each compares the modified route against a different alternative, and the comparison that matters for you depends on which alternatives your surgeon is offering.

That European study also reported the outcome most people care about. At a median of 3.6 years, 93.8% of the modified two-stage group and 91.5% of the three-stage group were living without a stoma, a difference that was not statistically significant. In the modified two-stage group, 78.4% never needed a temporary ileostomy, while 21.6% ended up needing one later. Total time in hospital over the first year was slightly shorter with the modified route (Moojen 2026). A meta-analysis of ten observational studies added a wrinkle: in children, the modified two-stage route had more leaks than the three-stage route, while in adults with less exposure to biologics it compared well against the classic two-stage approach (Luo 2020). All of this is observational, so sicker patients are steered towards particular routes and the comparisons cannot fully correct for that.

The loop ileostomy is the stage people underestimate

Many people find the end ileostomy after the first operation easier than they feared and the temporary loop ileostomy harder than they expected. A detailed eight-week update in r/UlcerativeColitis described going from emptying an end ileostomy four to six times a day to roughly ten times a day with the loop, with more watery output, more leaks and, on the last day before the final operation, seven bag changes in twelve hours (r/UlcerativeColitis thread). That matches the physiology: a loop ileostomy sits further up the small bowel, so less fluid is absorbed before it reaches the bag.

This matters because dehydration is one of the most common reasons people are readmitted. At the Mayo Clinic, 20.3% of people having two- or three-stage pouch surgery for UC were readmitted within 30 days. The leading causes were partial bowel obstruction or ileus, pelvic infection, dehydration and blood clots, and the authors singled out dehydration and clots as the preventable ones (McKenna 2017). Our ostomy tracking guide covers how to log output and drinks during this phase, and our guide to foods that cause ileostomy blockage covers the early weeks of eating with a stoma.

The good news is that people usually report feeling better once the loop is closed and things settle. In a Greek study of 47 people, quality of life scores were higher after closure of the temporary ileostomy than before surgery on both questionnaires used (Exarchos 2018). That study measured before surgery against after closure, so it says nothing about how people felt during the loop phase itself.

What does the "95% success rate" actually measure?

The figure you will hear most often, from surgeons, nurses and forum posts alike, is that j pouch surgery has a success rate of around 95%. It is not made up. But it usually means one of two specific things, and neither is "95% of people have no problems".

The best-known source is the Cleveland Clinic's series of 3,707 people who had a first pouch there between 1984 and 2010 (Fazio 2013). Its abstract reports:

• Pouch failure in 197 people, 5.3%, over a median follow-up of 84 months. That is 119 pouches removed, 32 left in place but not in use, and 46 rebuilt in a redo operation. The arithmetic adds up: 119 + 32 + 46 = 197.
• Functional outcomes and quality of life rated good or excellent in 95%.
• Early complications in 33.5% of people, and late complications in 29.1%, and that late figure excludes pouchitis.

So the 95% in that study is a function-and-quality-of-life rating. Pouch survival happens to land in a similar place, at about 94.7%, which is probably why the two get blurred. And both coexist with roughly one in three people having an early complication. A complication is not a failure, and most are dealt with, but "95% success" does not prepare anyone for the one-in-three.

The broader literature lands in a similar place. A meta-analysis of 43 studies and 9,317 people found pouch failure of 6.8%, rising to 8.5% in studies with more than five years of follow-up (Hueting 2005). An update pooling 53 newer studies and 14,966 people put pouch failure at 4.3% and found it had fallen over time (de Zeeuw 2012). The longest follow-up we found, from the Mayo Clinic, reported that 93.3% of people still had a working pouch at 30 years, with quality of life scores stable across that time (Lightner 2017).

Why the best-known numbers come from the best-known hospitals

The Cleveland Clinic and Mayo Clinic series are large, long and carefully kept. They are also from two of the highest-volume pouch centres in the world, reporting their own results. That is not a criticism; it is where the data exists. But it means the headline numbers describe what happens in very experienced hands.

A national picture can look different. In England between 1996 and 2008, 5,771 elective pouch operations were spread across 154 NHS hospital trusts. Pouch failure was 6.4%. Almost a third of trusts did fewer than two pouches a year, 91.4% of surgical teams did 20 or fewer over the whole eight years, and the median surgeon did 4. Lower institutional volume and older age independently predicted failure (Burns 2011). Read carefully, that abstract's own conclusion is worded loosely ("institutional volume ... positively associated with increased pouch failure"), but its results section is clear that it was low institutional volume that predicted failure.

One r/UlcerativeColitis poster said their surgeon had quoted a success rate of 80 to 90% (r/UlcerativeColitis thread), and another, who chose a permanent ileostomy instead, put the pouch's success rate at "95%-ish" (r/UlcerativeColitis thread). Both can be honest numbers for different definitions. The useful question back is: "Success meaning what, measured how long after surgery, and in whose hands?"

The gap between what gets published and what people live with

Patients consistently report more day-to-day problems than surgical outcome series suggest, and are still mostly satisfied. That combination is exactly what the "what I wish I knew" threads describe, and there is research behind it.

A Dutch study sent a questionnaire to all 137 members of the national Crohn's and colitis patient society who had a pouch, and 111 replied. It then compared their answers with the pooled figures from the surgical literature. People reported sexual dysfunction (19.8%), passive leakage (23.4%) and soiling (39.3%) significantly more often than the meta-analysis had found. Nevertheless, 90% were satisfied with the result (Hueting 2004). Patient-society members may not represent everyone with a pouch, and 111 people is a small sample, but the direction of the gap is the point: surgeon-reported series tend to undercount the things people find hardest to bring up.

A 2025 qualitative study ran focus groups with 15 people who had a pouch for UC, deliberately including both people with normal pouch function and people with pouch inflammation. Participants described frequency, urgency and incontinence shaping work and daily life, and many had changed their daily schedule or diet around them. Most still said their quality of life had improved after surgery (Barnes 2025). The authors' conclusion was that pouch patients need their own outcome measures, because the standard ones miss what matters to them.

The Reddit threads fill in the texture:

• "Never trust a fart." Several long-term pouch owners said it took years to tell gas from stool reliably, and some never fully could (r/UlcerativeColitis thread, r/UlcerativeColitis thread).
• Nights. Waking once or more to empty the pouch is commonly described, and people describe planning meals and timing around it.
• Sore skin. Pouch output is looser and more irritating than formed stool, and several people mention needing a barrier cream, especially early on.
• Frequency that is "normal for me". Replies ranged from four to six times a day to ten or more, with some saying it bothered them far less than they expected because the urgency of active colitis was gone.

On numbers: the pooled average in the 2012 update was 5.9 bowel movements in 24 hours (de Zeeuw 2012), and in the 30-year Mayo follow-up, daytime frequency rose slightly from 5.7 at one year to 6.2 at 30 years, and night-time frequency from 1.5 to 2.1 (Lightner 2017). Those are averages; your own number depends on your pouch, your diet and your other health. Our guide to how many bowel movements a day with a j pouch goes through where those numbers come from and how they change over the first year.

The way the pouch is joined can affect night-time leakage. A meta-analysis of 4,183 people compared hand-sewn joins (usually with the remaining rectal lining stripped away) against stapled joins. Night-time seepage and pad use favoured the stapled technique, and squeeze and resting pressures were lower after hand-sewn joins. Daytime frequency did not differ (Lovegrove 2006). The trade-off is the small strip of rectal lining a stapled join leaves behind, which we come to below. Which technique suits you is a surgical judgement, but knowing that the choice exists, and that it has consequences you will live with, is exactly the kind of thing people wish they had asked about.

Pouchitis is common, and it is not the same as the pouch failing

Pouchitis is inflammation of the pouch itself, and it is the most common complication after pouch surgery for UC. If you go in expecting to never get it, the first episode can feel like failure. It usually is not.

• In US insurance claims data covering 594 people with UC, 48% developed pouchitis within two years of their pouch. For 29% it was an isolated episode; for 19% it recurred. Among people with pouchitis, only 1.0% had their pouch removed in that period (Barnes 2021).
• In Denmark, using national registries covering all 1,664 people who had a pouch for UC between 1996 and 2018, the two-year figure rose from 40% in 1996 to 2000 to 55% in 2015 to 2018 (Barnes 2023). Nobody yet knows why it is rising.
• Over the very long term, the Mayo follow-up put the 30-year cumulative chance of pouchitis at 80.2% (Lightner 2017).

The claims-data and registry studies identify pouchitis from diagnosis codes and prescriptions, which can overcount episodes that were treated on suspicion. Even allowing for that, the honest expectation is "probably at some point" rather than "hopefully never".

In the threads, people describe pouchitis as a cluster of more frequent, more urgent trips with gas-like cramping, sometimes with tiredness and loss of appetite, and many describe feeling better within a couple of days of starting antibiotics (r/UlcerativeColitis thread). The 2024 American Gastroenterological Association guideline reflects that same pattern: it suggests antibiotics for intermittent pouchitis, probiotics to prevent recurrences in people whose pouchitis responds to antibiotics, and advanced immune-targeted therapies for pouchitis that keeps coming back or does not respond. All nine of its recommendations are conditional, meaning the evidence is limited (Barnes 2024, AGA guideline). Treatment is always a decision for your team, not something to start on your own. Once you have a pouch, our guide to tracking symptoms with a j pouch covers how to tell a pouchitis pattern from a bad week and why logging each antibiotic course matters.

Two things raise the odds, and both are worth knowing before surgery. In the US claims study, people with primary sclerosing cholangitis, a liver condition linked to IBD, had nearly four times the odds of pouchitis, and people treated with anti-TNF drugs before colectomy had higher odds too (Barnes 2021). The anti-TNF finding is an association, and probably reflects how severe the colitis was rather than the drug itself. For what the years after the operation look like, see life after colectomy for ulcerative colitis.

Crohn's disease of the pouch, and why people get told it "turned into Crohn's"

Some people who had a pouch for UC are later diagnosed with Crohn's disease affecting the pouch or the small bowel above it. In the same US claims study, 9.0% received a new diagnosis of Crohn's disease after pouch surgery for UC (Barnes 2021). The AGA guideline treats "Crohn's-like disease of the pouch" as its own condition with its own treatment approach (Barnes 2024, AGA guideline).

This is behind several of the hardest stories in the threads, including people who lost a pouch after years to fistulas and inflammation (r/ostomy thread). One long-term poster blamed specific medicines for their Crohn's-like symptoms; an IBD-experienced replier pointed out that drugs are extremely unlikely to cause Crohn's (r/UlcerativeColitis thread). We have no evidence either way on that individual case, and neither does a forum thread. What is fair to say is that a minority of pouches run into this, and it is worth asking your team how they would recognise and manage it.

The cuff, the stump, and the "cancer within ten years" rumour

Two leftover bits of bowel come up repeatedly before surgery, and both are surrounded by confident claims.

The rectal cuff. When the pouch is joined to the anus, most surgeons leave a short cuff of rectal lining because removing every last bit can affect continence. That lining can still be affected by colitis, which is called cuffitis. A long-term pouch owner in one thread described still getting flares in their cuff decades later, "but nowhere near full colon flares" (r/UlcerativeColitis thread). The AGA guideline suggests treating cuffitis with standard UC therapies, starting with rectal treatments (Barnes 2024, AGA guideline). The stapled-versus-hand-sewn meta-analysis also found a non-significant signal of more precancerous change in the leftover zone with stapled joins, which the authors could not quantify (Lovegrove 2006). Its abstract reports that signal as an odds ratio of 0.42 while describing it as higher in the stapled group, which only makes sense if the ratio is expressed hand-sewn over stapled; we could not confirm the direction from the abstract alone.

The rectal stump. In three-stage and modified two-stage surgery, the rectum is left in place after the first operation. People commonly notice mucus or discharge from it, and sometimes blood. A 2026 narrative review found that microscopic inflammation of an unused rectum ("diversion proctitis") develops in most people, 71.4% to 100% across studies, but only 30 to 40% get symptoms. The same review put the overall risk of cancer in the rectal stump after subtotal colectomy for UC as low as 0.7%, with previous colorectal precancer or cancer as a major risk factor, and noted there is no agreed surveillance schedule (Argyriou 2026).

So when a Reddit commenter says there is "an extremely high chance" of rectal cancer within ten years if the stump is left (r/ostomy thread), that is not what the review found. The stump is a real consideration, especially if you have had dysplasia, and it should be checked as your team advises. It is not a ticking clock for most people.

Fertility: raise it before the pouch stage, not after

For women who may want children, the timing of the pouch operation is one of the most important things to discuss in advance. A meta-analysis of studies of women with UC found infertility, measured as not conceiving within 12 months of trying, rose from about 15% with medical treatment to about 48% after pouch surgery, a relative risk of about three (Waljee 2006). The abstract itself defines infertility as "achieving pregnancy in 12 months", which is an obvious slip; the 15% and 48% figures only make sense as the share not conceiving in that time.

The usual explanation is tubal infertility from scarring after pelvic surgery, and keyhole surgery tends to cause fewer adhesions. In a cross-sectional study from three Dutch and Belgian university hospitals, 50 women tried to conceive after pouch surgery, and pregnancy rates were higher after laparoscopic than open surgery (Bartels 2012). Fifty women is small, and a questionnaire study cannot prove the operation caused the difference, but it is consistent with the adhesion explanation.

This is where the staged approach helps. Because the first operation usually leaves the rectum in place with an end ileostomy, some people choose to stay at that stage until their family is complete, then decide about the pouch. People in the threads describe exactly that plan (r/UlcerativeColitis thread). Our guide to questions to ask your gastroenterologist about colitis covers how British guidance frames this conversation.

Men are not exempt from pelvic surgery effects either. Sexual dysfunction in the Dutch patient survey was reported across the whole group at 19.8% (Hueting 2004), and one young man in an r/ostomy thread described being warned about a chance of nerve damage affecting sexual function (r/ostomy thread). Ask your surgeon for their own figures and what they do to protect the pelvic nerves.

Who does the operation matters, and you are allowed to ask

Surgeon and hospital experience is one of the few things you can influence, and pre-surgery threads repeatedly say "go to someone who does a lot of these." One detailed reply put it in practical terms: the first operation, removing the colon, is something most colorectal surgeons do routinely, while the pouch stage is more specialised, so the surgeon for that stage matters more (r/UlcerativeColitis thread).

The English national data backs the concern. When most surgical teams do only a handful of pouches over eight years, and low-volume institutions see more failures (Burns 2011), it is reasonable to ask how many your surgeon and hospital do. Low-volume surgeons in that study also operated on more people at the extremes of age, so some of the difference is case mix, but the institutional effect held after adjustment.

What counts as "high volume" varies between countries and studies, and we are not going to invent a threshold. The questions are what matter: how many pouches do you do a year, how many does this hospital do, and what are your own leak and failure rates? A surgeon who does these regularly will usually have the numbers to hand.

Skin, stoma siting and the supplies nobody mentions

If you will have a stoma at any stage, ask for a stoma nurse visit and site marking before the first operation. That is where the stoma nurse marks the best spot on your abdomen, checking how it sits when you bend, sit and stand. A 2022 meta-analysis rated the evidence as low to very low certainty, but found marking was associated with fewer stoma complications, less leakage, fewer skin problems and better quality of life, and concluded that because marking poses no harm it should be done (Ambe 2022).

That chimes with the threads. One person warned that a stoma sitting flush with the skin made keeping a wafer on a constant battle (r/ostomy thread), and another needed a deep convex flange for the same reason (r/UlcerativeColitis thread). How far a stoma protrudes is partly a surgical decision, so it is fair to ask about it.

Skin problems are common enough to plan for. In an Italian series of 44 people with a temporary loop ileostomy after pouch surgery, 14 developed skin inflammation around the stoma, and a retracted stoma was a strong predictor (Scarpa 2010). After the pouch is connected, the skin problem moves: people describe sore, burning skin around the anus from frequent, loose output, particularly in the first weeks. A patient-written guide from the ImproveCareNow community lists barrier ointment, walking, rest and building up the anal muscles in the months before surgery among the things its author wished she had known (ImproveCareNow). Ask your team which products they recommend, rather than guessing.

Would people choose a j pouch again?

Most people would, some would not, and research has not found either a pouch or a permanent ileostomy clearly better for quality of life. A systematic review of 13 studies comparing the two found neither procedure clearly superior, and most people were satisfied with whichever they chose. The authors noted that most of the quality-of-life gain comes from getting rid of the colitis itself (Murphy 2015). The studies were small, observational and used different measures, so the honest reading is "no clear winner" rather than "identical".

In one r/UlcerativeColitis poll, 36 people said they chose a pouch and were happy, 5 chose a pouch and regretted it, 12 chose an end ileostomy and were happy, and 8 chose an ileostomy and regretted it (r/UlcerativeColitis poll). That is 61 self-selected votes on a forum, not a study, and the poll author said as much. It is a reminder that regret exists in both directions.

The threads also make a point the research supports: forums over-represent problems. People whose pouch works tend to stop posting, as one pouch owner of two years noted (r/UlcerativeColitis thread). And in r/ostomy, plenty of people describe choosing to keep the bag: some because the urgency and frequency they hated about UC can persist with a pouch, some because they did not want more operations, and some because their surgeon or IBD team thought the bag would give them a better life (r/ostomy thread, r/ostomy thread). In one r/IBD thread, two commenters identifying as doctors gave opposite impressions: one said most of their patients really like their pouches and do well with them, the other that most of their patients with an ostomy actually prefer it, and that keeping the end ileostomy is always an option (r/IBD thread). We cannot verify either commenter's credentials, but the split matches the review.

A 2026 review of shared decision-making in UC surgery makes the same case formally: most people are eligible for either a pouch or a permanent ileostomy, each changes daily life in different ways, and patient preferences should drive the choice (Cain 2026). If your surgeon presents only one option, it is reasonable to ask why.

One thread that is different: surgery for cancer or dysplasia

The original "what do you wish you knew" thread came from someone with longstanding UC who felt well but had been diagnosed with colorectal cancer and high-grade dysplasia (r/UlcerativeColitis thread). The replies, including from people identifying as doctors, were nearly unanimous that the cancer operation should not wait, and that the pouch-or-bag question could be decided afterwards, since it is often a separate stage. One reply suggested stopping immunosuppression to "resolve" the cancer instead of having surgery; it was heavily downvoted and directly contradicted by the physicians in the thread (r/IBD thread). If you are facing surgery because of cancer or dysplasia, the timing conversation belongs with your surgical and oncology team, and nothing in this article is a reason to delay it.

What to arrange before surgery

These are the practical things people say made the difference, cross-checked against the evidence where any exists.

1. See a stoma nurse and get marked, even if your stoma will be temporary (Ambe 2022).
2. Ask which staging route you are likely to have, and what would change it.
3. Line up a "bag buddy." One pouch owner said their ostomy nurse urged them to become independent fast, but learning bag changes alongside a partner or family member made troubleshooting far easier (r/UlcerativeColitis thread).
4. Plan drinks for the loop ileostomy phase. Ask your team what to drink, how much, and which warning signs of dehydration mean you should call. Dehydration is a leading, preventable cause of readmission (McKenna 2017).
5. Know the clot plan. Blood clots were another leading readmission cause in the same study; ask whether you will go home on preventive treatment and what symptoms to watch for.
6. Get soft, high-waisted clothing that will not press on a stoma or incision.
7. Sort the bathroom and bed. A toilet near where you sleep, and something to sit on that is comfortable for a sore bottom, help in the first weeks after the pouch is connected.
8. Ask about barrier products for skin around the stoma and, later, around the anus.
9. Set expectations for time off in stages, not as one block. Recovery after each operation is different, and the loop phase is often more demanding than people expect.
10. Record a baseline. Write down your current bowel pattern, urgency, night-time trips, medicines and blood results. After surgery, people often find it hard to remember how bad things were, and a record helps both you and your team judge how the pouch is doing. Our guide to what to track in an IBD symptom diary covers a treatment record that is useful here. Clairop's one-page GI visit report puts bowel pattern, an activity score, medication adherence and labs on a single page if you want something to bring to the surgical consultation.

Questions worth asking the surgeon

Our questions to ask your gastroenterologist about colitis covers the medical side. These are the surgical ones that pre-surgery threads say people wished they had asked.

• How many pouch operations do you, and this hospital, do each year? What are your leak and pouch failure rates?
• How many stages do you plan for me, and why? Could I live with the end ileostomy for a while before deciding?
• Will I have a temporary loop ileostomy? For how long?
• Will you do this by keyhole or robotic surgery, and what would make you switch to open surgery?
• Will the join be stapled or hand-sewn, and how much rectal cuff will you leave?
• What happens to fertility and sexual function, and what do you do to protect the pelvic nerves?
• If I have primary sclerosing cholangitis, or have been on several biologics, how does that change my risks?
• What happens if the pouch does not work? Can it be redone, or converted to a permanent ileostomy?
• After discharge, who do I call, and at what point should I come back in?

Myths worth dropping before you decide

"95% of j pouches work perfectly." No. The 95% usually refers to good or excellent function and quality of life in a high-volume centre, or to pouch survival. About a third of people in that same series had an early complication (Fazio 2013).

"If you get pouchitis, your pouch has failed." Pouchitis affects around half of people within two years, and in the US claims study only 1% of those with pouchitis had their pouch removed within that period (Barnes 2021).

"Pouches only last about ten years." In a 30-year Mayo follow-up, 93.3% still had a working pouch (Lightner 2017). One poster in r/UlcerativeColitis said their doctors seemed surprised they still had a pouch after 25 years (r/UlcerativeColitis thread); the data suggests that should not be surprising.

"Once the colon is gone, you are cured and never need a doctor again." Most of the colitis is gone, but pouchitis, cuffitis, Crohn's-like disease of the pouch and stump or cuff surveillance can all mean ongoing follow-up (Barnes 2024, AGA guideline).

"Leaving the rectum means a high chance of cancer within ten years." Not in the review we read: overall stump cancer risk after subtotal colectomy for UC was put as low as 0.7%, with past dysplasia or cancer the main risk factor (Argyriou 2026).

"Choosing a permanent bag is giving up." Research has not found either option clearly better for quality of life (Murphy 2015), and many people choose the bag deliberately.

When to contact your team promptly

Before and between operations, call your surgical team or seek urgent care for:

• Fever, shivers or worsening abdominal or pelvic pain, which can signal a leak or infection.
• No stoma output with vomiting or swelling, which can be a blockage.
• Signs of dehydration, such as dizziness on standing, very dark or little urine, or high, watery stoma output you cannot keep up with.
• A swollen, painful calf, chest pain or breathlessness, which can be a blood clot and needs emergency care.
• Heavy bleeding from the stoma, the rectal stump or the anus.

After the pouch is working, tell your team about a sustained rise in frequency, urgency, cramping, fever or blood. Those can be pouchitis, cuffitis or something else, and the treatment depends on which.

If you have not had surgery yet and your colitis is getting worse quickly, with frequent bloody stools, fever or a racing heart, that is a reason to go to hospital now. Our guide to when to go to the hospital for a UC flare covers those thresholds.

The honest bottom line

A j pouch is, for most people, a long-lasting operation that they are glad to have had. The things people wish they had known are not secrets. It is usually a staged process, and on most routes the first stage leaves an end ileostomy you can live with and judge first. The headline success figures are real but narrow, and patients report more day-to-day problems than surgical series capture. Pouchitis is common and usually treatable. Fertility, the surgeon's experience and the choice of technique are worth raising before the pouch stage, not after. And keeping the bag is a legitimate decision that research does not rank below the pouch.

Go in with the numbers, a list of questions, a baseline record of how you are now, and someone at home who knows how to change a bag. That is most of what the people who have done it say they wish they had brought.