Feel Like You Need to Poop After You Just Went?

If you feel like you need to poop again straight after you have just been, you are not imagining it and you are far from alone. In a study where people with IBS kept a stool diary for two weeks, they reported a feeling of incomplete evacuation after 51% of their bowel movements, against 21% for people without IBS (Sjödahl 2024). The feeling has three main sources: stool that really is still there because the outlet did not open properly, a rectum that sends a "still full" message when it is mostly empty, and more stool arriving from higher up. They feel identical from the inside, they respond to different things, and the most common piece of advice people get for it (strengthen your pelvic floor, eat more fibre, sit longer) can make one of them worse.

This article is about the IBS version, where there is no inflammation in the bowel. If you have ulcerative colitis and the urge comes with mucus or blood and nothing to pass, that is tenesmus driven by an inflamed rectum, and our guide to tenesmus in ulcerative colitis covers it. If you have Crohn's disease and feel blocked, our post on Crohn's with constipation rather than diarrhoea covers the narrowing question that changes the answer there.

The short answer: one feeling, three different causes

The feeling that you are not finished is a message from the rectum and the nerves around it, and that message can be accurate or inaccurate. That is the whole problem in one sentence.

Here are the three things that produce it, in the order they are usually discussed in clinic:

1. Stool is still there because it could not get out. The muscles of the pelvic floor and the anal sphincter are supposed to relax when you push. In some people they tighten instead, or do not relax enough, or the push itself is too weak. The result is real stool left behind. This is called dyssynergic defecation, or more broadly a functional defecation disorder.
2. The rectum says "full" when it is not. The rectum's job is to report stretch. In IBS that reporting system is often turned up, so a small amount of stool, gas or even the after-effects of the bowel movement you just had can register as "there is more".
3. More stool really is arriving. The colon does not empty in one go. Contractions that push stool down often come in clusters, so the second urge can be the next batch, especially in IBS with diarrhoea and especially in the morning.

These overlap. Someone can have a pelvic floor that does not relax fully and a sensitive rectum at the same time, and plenty of people do. But it helps to know they are separate, because they respond to different things. Laxatives do very little for the first. Sitting longer and straining harder tends to make the first and second worse. And the third mostly needs time, not effort.

Is this an IBS symptom, or something else?

It is a recognised IBS symptom, but not a diagnostic one. That is a useful distinction.

The idea goes back a long way. When Manning and colleagues asked 109 people attending gastroenterology and surgery clinics about 15 symptoms, then checked who turned out to have IBS, a sensation of incomplete evacuation was common in the IBS group. It was not one of the four symptoms that actually separated IBS from other disease, though. Those were distension, pain relieved by a bowel movement, and looser and more frequent stools when pain began (Manning 1978).

Forty years later the Rome IV committee, which writes the criteria most gastroenterologists use, put it the same way: excessive straining, urgency, feelings of incomplete evacuation and mucus are common in IBS but are not specific to it (Lacy 2016). A systematic review of individual IBS symptoms found that no single symptom was very good at telling IBS apart from other conditions, with positive likelihood ratios running from only 1.2 to 2.1 across the symptoms studied (Ford 2008).

What this means in practice: the feeling fits with IBS, but it does not prove you have IBS, and having IBS does not explain every case of it. That matters because the most useful thing a clinician can do with this symptom is ask what is causing it in you, not just file it under the existing diagnosis.

How it fits with your subtype also matters. In IBS with constipation it often travels with straining and hard stools. In IBS with diarrhoea it more often comes with urgency and a cluster of loose stools. If you are not sure which subtype you are, our explainer on the difference between IBS-D and IBS-C walks through the rule, and people who swing between the two will recognise the pattern in our guide to managing IBS-M.

"Completely empty" is not normal either

One of the most useful facts about this symptom is also the least known: a normal bowel movement does not empty the rectum completely, and it does not empty the colon at all in the sense most people imagine.

In a study that used a radioactive tracer to watch the bowel during real, spontaneous bowel movements, the rectum emptied by an average of 66%. The left side of the colon emptied by an average of 32% and the right side by 20%. In 12 of the 13 people whose left colon could be seen, it visibly emptied during the bowel movement (Lubowski 1995). That study was tiny, 14 people, and mixed: eight healthy volunteers, four with constipation and two with IBS. So treat the exact percentages loosely. The direction is the point: a bowel movement is a partial emptying of a long tube, not a tank being drained.

Two other details reinforce this. In a study of 52 healthy volunteers, resident doctors with a mean age of 29, 28.8% said at the start that they had experienced incomplete emptying (Modi 2019). And in the diary study above, people without IBS reported it after one bowel movement in five (Sjödahl 2024).

Why does this matter? Because a lot of people with this symptom are chasing a sensation of total emptiness that most bodies never deliver, and the chase is where the harm comes from: long toilet sessions, straining, repeated wiping, and stimulant laxatives taken to produce a feeling rather than to treat constipation. A reasonable goal is "finished enough that I can get on with my day", not "nothing left".

That is not the same as saying your symptom is normal. Feeling unfinished after half your bowel movements, for years, with stool you can actually feel or have to remove, is not normal and is worth investigating. The point is narrower: the absence of total emptiness is not itself the problem.

Cause one: stool that could not get out

This is the cause with the best evidence, the best tests and the best treatment, and it is the one most often missed in IBS.

To pass stool, three things have to happen at once: the abdominal muscles and rectum push, and the puborectalis muscle (a sling that holds the rectum at an angle) and the anal sphincter relax. In dyssynergic defecation, the relaxing half fails. The muscles tighten, or stay tight, at exactly the moment they should open. The push meets a closed door, part of the stool gets through and part does not, and you get up feeling unfinished because you are.

How does it feel? In a study of 118 people diagnosed with dyssynergia on symptoms and manometry, 84% reported excessive straining and 76% a feeling of incomplete evacuation. Bloating was reported by 74%, and 48% used their fingers to help stool out (Rao 2004). That last one is worth naming plainly, because people are embarrassed by it: pressing around the anus or inside the vagina, or removing stool with a finger, is a recognised sign that the outlet is not working, not a personal failing.

It is not only an IBS-C problem, but it is common there

The Rome II and III criteria for dyssynergic defecation required IBS to be excluded (Patcharatrakul 2011), which kept the two diagnoses apart for years. Rome IV changed that: a functional defecation disorder can now be diagnosed in someone who meets the criteria for functional constipation or IBS with constipation, as long as testing shows impaired evacuation (Rao 2016).

The studies that have looked find plenty of it:

• In 50 women referred with constipation and at least two symptoms of pelvic floor dyssynergia, the 25 with IBS showed the same dyssynergia physiology as the 25 with functional constipation, and were more likely to fail the balloon expulsion test (Suttor 2010).
• In 231 people with chronic constipation having anorectal testing at a centre in India, 47 of the 99 with IBS-C had an abnormal defecation pattern, and 42 of those 47 (89.4%) had dyssynergia rather than weak propulsion (Goyal 2019). Note that 87.8% of that cohort were men, which is unusual for constipation research, so the figures may not transfer neatly.
• In 317 people referred to a pelvic floor centre at Massachusetts General Hospital for obstructed defecation, IBS and dyssynergia were both independently linked to worse obstructed-defecation scores, while the grade of internal rectal prolapse seen on imaging was not (Cavallaro 2019). The authors' conclusion was that people being considered for surgery should be screened and treated for IBS and dyssynergia first.

A number in one of these papers does not add up, and we could not settle it. Goyal 2019 defines a functional defecation disorder as an abnormal manometry result and an abnormal balloon expulsion test. It reports abnormal balloon expulsion in 43.4% of the IBS-C group (43 of 99), but diagnoses a functional defecation disorder in 46.5% (46 of 99). If both tests had to be abnormal, the second figure cannot be higher than the first. We could not reconcile this from the abstract, so we have quoted only the dyssynergia count (42 of 47), which does not depend on it.

Soft stool does not rule it out

A recurring question in r/ibs is how stool can be soft and still feel stuck (r/ibs thread). The person who started that thread described stool that ranged from diarrhoea to mushy, a bowel movement that was easy to pass until the end, and the end that never cleared. Dyssynergia is a coordination problem, not a stool problem, so soft stool can absolutely be held back. In the Rao series, only 60% of the women and 41% of the men described hard stools (Rao 2004).

Sticky, pasty stool that smears is a related but separate complaint. One reply in that thread mentioned a positive stool test for fat malabsorption, and fat or bile acid problems can change stool texture. Our comparison of bile acid malabsorption and IBS covers when that is worth testing for.

Structural findings: real, but often not the cause

People who get imaging are often told about a rectocele (a bulge of the rectal wall towards the vagina) or an internal intussusception (the rectal wall folding in on itself). Both can contribute. But in a study of 47 healthy young volunteers having defecography, rectoceles during defecation were "a very common finding in women", and the normal range of measurements overlapped with states usually called abnormal (Shorvon 1989). The Massachusetts study above found that the grade of intussusception did not track symptom scores at all (Cavallaro 2019). So a structural finding is a reason for a careful conversation, not automatically the explanation, and not automatically a reason for surgery.

Cause two: a rectum that says "full" when it is not

The second cause is a sensor problem. The rectum is supposed to report "stool here, find a toilet" when it stretches past a certain point. In IBS, that reporting is frequently altered.

The classic study measured rectal sensation with a balloon in 100 people with IBS and 15 controls. Ninety-four percent of the IBS group showed altered rectal perception: lower thresholds for discomfort, more intense sensations, or sensations felt in unusual places (Mertz 1995). When perception thresholds were re-measured three months later in 15 of them, changes in thresholds moved with changes in symptoms.

There is a detail in that paper that most summaries leave out, and it matters for this symptom. The hypersensitivity showed up for unpleasant sensations during rapid inflation. The threshold for the normal "stool is here" sensation, and the thresholds during slow inflation, were normal (Mertz 1995). So the evidence does not say an IBS rectum simply reports stool at a lower volume. It says the rectum turns sudden stretch into discomfort more easily. The end of a bowel movement, with the rectal wall contracting and relaxing and the anal canal still sensitised, is exactly the kind of fast, intense input that this would amplify. That is a reasonable explanation of the false alarm, but it is our interpretation of a mechanism, not something any study has measured at the end of a real bowel movement.

The sensor can also err the other way. In rectal hyposensitivity, the rectum reports too little, so stool builds up without a clear urge and is incompletely cleared. Rome IV notes that reduced rectal sensation can contribute to stool retention, and that retention can in turn dull sensation further (Rao 2016). In the Indian clinic study, though, rectal hyposensitivity was found in 60.6% of people with functional constipation and in only 2% of those with IBS-C (Goyal 2019). In IBS, an over-alert sensor is the more typical finding.

Why the feeling persists even with almost nothing there

People in the threads often say the worst part is not the leftover stool but the attention. One person described thinking about it all day (r/ibs thread). That is not a sign of weakness. In the diary study, people who had all the defecation symptoms together reported higher stress and lower quality of life (Sjödahl 2024). That is an association: it cannot tell you whether the symptom causes the stress, the stress amplifies the symptom, or both. In people with faecal incontinence, the same research group found three quarters also reported incomplete evacuation, and those who did had worse quality of life in every domain, even though their manometry results were distributed the same way as everyone else's (Sjödahl 2026). The symptom carried weight that the pressure measurements did not explain.

That gap between how much a symptom bothers someone and what the tests show turns up repeatedly. In 107 people with chronic constipation having anorectal testing, distress from pelvic floor symptoms was higher with IBS-C than with functional constipation, but it did not correlate with manometry or balloon expulsion results (Singh 2019). For the sensory version of this symptom, the gut-brain treatments that work on IBS pain more broadly are worth knowing about. Our review of whether gut-directed hypnotherapy works for IBS covers that evidence. We could find no trial of hypnotherapy or CBT that used incomplete evacuation as its outcome, so that is an extrapolation, and we say so.

Cause three: there really is more on the way

The third cause is the simplest. The colon pushes stool down in waves, and the waves do not all arrive at once.

The strongest pushes are called high-amplitude propagating contractions. They sweep stool from higher up the colon towards the rectum. Waking and eating both switch the colon on, and our post on why IBS flares in the morning covers the evidence on the morning surge, while our guide to needing to poop right after eating covers the meal response. We will not repeat either here.

What matters here is that in IBS with diarrhoea these contractions can be more frequent and more forceful. In a small study comparing 10 people with IBS who had pain and frequent or loose stools against 10 healthy controls, the IBS group had more of these contractions with higher peak pressures, faster transit, and abdominal pain coincided with more than 90% of them (Chey 2001). Ten people per group is small, so it is a mechanism, not a measure of how common this is.

So in IBS-D the second urge 15 minutes later is often exactly what it feels like: the next delivery. The person in the "second poop" thread who said they usually do not know they are unfinished until the urge returns a quarter of an hour later is describing this pattern well (r/ibs thread). Several people there added that the second bowel movement only ever comes when they are moving around, not while they sit. We could find no study of that specifically. It fits with the physiology, since walking and changing position help the colon move stool down and alter the angle at the outlet, but treat it as a plausible explanation rather than an established one.

How to tell which one you have

You cannot diagnose yourself with certainty, and the tests themselves disagree with each other more than you might expect. But your own pattern usually points somewhere, and that gives you something specific to take to a clinician.

If you match rows in more than one category, that is normal. The table is a way of organising what you tell your clinician, not a diagnosis.

What the tests involve

When a clinician suspects an outlet problem, the standard work-up is short and does not involve sedation.

• A digital rectal examination. A clinician asks you to push against their finger and feels whether the muscles relax. In a single study it had a sensitivity of 75% and a specificity of 87% for detecting dyssynergia (Rao 2016), so it is a useful first look, but it misses about a quarter of cases.
• Anorectal manometry. A thin catheter measures pressures in the rectum and anal canal while you squeeze, rest and push. It also usually tests rectal sensation with a small balloon, which is how a sensitive or an underactive rectum gets picked up.
• Balloon expulsion test. You are asked to pass a small water-filled balloon, usually in private on a commode. Normal time ranges from one to two minutes depending on the method used. A normal result does not always rule out a problem, because a balloon does not behave exactly like stool (Rao 2016).
• Defecography. Imaging, by X-ray or MRI, of the rectum while it empties. Used when the first tests disagree, or to look for structural problems.

Rome IV requires two of the three (manometry, balloon expulsion and imaging) to be abnormal before diagnosing a functional defecation disorder. The reason is honest and worth knowing: there is no single gold standard test, agreement between tests is limited, and a considerable proportion of healthy people show a dyssynergia pattern on high-resolution manometry (Rao 2016). One abnormal test alone is not a diagnosis.

Rome IV also says physiological testing should be considered if there is not enough response to conservative measures first: education about bowel habits, more fibre and fluid, and stopping constipating medicines where possible (Rao 2016). That is the usual order. If you have been through those and are still stuck, it is reasonable to ask about anorectal testing directly. Several people in the threads describe gastroenterologists who were reluctant to order it (r/ibs thread). Our guide on whether to see a gastroenterologist for IBS covers what a specialist adds and how referral works.

What actually helps, ranked by the evidence

This section is matched to the three causes, because that is how the evidence is organised. None of it replaces an assessment, and none of it is a reason to start, stop or change a medicine without your clinician.

For an outlet that will not relax: biofeedback

This is the one treatment in this article backed by randomised trials. Biofeedback uses a sensor in the anal canal, a screen, and a therapist to teach you to relax the pelvic floor while pushing effectively, retraining a coordination that has gone wrong.

• Against laxatives. People with severe pelvic floor dyssynergia who had not responded to fibre plus occasional enemas or suppositories were randomised to five weekly biofeedback sessions or to a laxative plus counselling. At six months, 43 of 54 (80%) in the biofeedback group reported major improvement, against 12 of 55 (22%) on laxatives. Biofeedback also produced bigger reductions in straining, the feeling of incomplete evacuation and the feeling of blockage, and the benefit held at two years (Chiarioni 2006). The trial was funded by the US National Institutes of Health.
• Against a sham. In 77 people with dyssynergia randomised to real biofeedback, sham feedback, or standard therapy (diet, exercise and laxatives), real biofeedback did better at correcting dyssynergia, cutting balloon expulsion time, increasing complete spontaneous bowel movements and reducing digital manoeuvres. Global bowel satisfaction was higher than with sham (Rao 2007). A sham arm matters, because it shows the benefit is not just the attention of a therapist.
• In people with IBS specifically. In 50 people with dyssynergia, biofeedback succeeded in 16 of the 29 who also had IBS and 14 of the 21 who did not, a difference that was not statistically significant. Among those with IBS, IBS symptoms disappeared more often in people whose defecation pattern improved (8 of 12) than in those whose did not (4 of 17) (Patcharatrakul 2011). That is a small study, and "not significantly different" is not the same as "proven equal", but it is the direct answer to the worry that having IBS means biofeedback will not work.

Two honest limits. First, Rome IV states that biofeedback does not help constipated people who do not have a defecation disorder (Rao 2016), which is why testing comes first. Second, access is patchy; a specialist pelvic floor physiotherapist is often the practical route, and in the thread one person who was told they had "global weakness" by a general physiotherapist was given strengthening exercises that did not help (r/ibs thread).

Posture: a footstool, with modest evidence

Raising your feet so your knees sit above your hips, or leaning forward with elbows on knees, straightens the angle between the rectum and the anal canal.

• In healthy volunteers. In the 52 resident doctors mentioned above, using a footstool for two weeks after two weeks without one was associated with more feeling of complete emptying (odds ratio 3.64, 95% CI 2.78 to 4.77) and less straining (Modi 2019). The odds ratios are per bowel movement, not per person. The authors themselves list the limits: emptiness and straining were self-rated, nobody was blinded, the participants were healthy, and only about half as many bowel movements were recorded in the footstool weeks as in the weeks without it.
• In people who could not evacuate. In 22 patients who could not empty a barium paste sitting upright during defecography, leaning forward into what the authors called the "Thinker" position widened the anorectal angle (113 degrees sitting against 134 leaning), and 11 of the 22 could then empty completely (Takano 2016). There was no comparison group and the forward position was always the second attempt, so some of that may be a second try rather than posture.

Cheap, harmless and worth trying, but the person who started the biggest thread already had a footstool and it was not enough. If it does not help, that tells you something too.

Toilet time: get up sooner than you think

There is no trial that sets an ideal number of minutes. What there is:

• Longer sitting goes with haemorrhoids. In 125 adults having screening colonoscopy at Beth Israel Deaconess Medical Center, 37.3% of those who used a smartphone on the toilet spent more than five minutes per visit, against 7.1% of non-users, and smartphone use was associated with a 46% higher risk of haemorrhoids after adjusting for age, sex, BMI, exercise, straining and fibre intake (Ramprasad 2025). This is a single cross-sectional study, so it shows an association, not proof that the phone or the sitting caused the haemorrhoids.
• Long sessions are themselves a symptom. In people with faecal incontinence, those who also felt incomplete evacuation were more likely to report bowel movements taking 20 minutes or more (14% against 6%) (Sjödahl 2026).

The practical rule many people in r/ibs report from their pelvic floor physiotherapists is about ten minutes, then get up, move around and come back if the urge returns (r/ibs thread). That is clinical advice passed on second-hand rather than a trial result, but it is consistent with everything above. Haemorrhoids and fissures can then produce their own feeling of something still being there, which turns into a loop.

Fibre: depends which problem you have

Fibre is the advice everyone gets first, and the evidence says it helps some people a lot and others not at all.

• For IBS overall, a meta-analysis of 14 randomised trials found soluble fibre (such as psyllium) improved global IBS symptoms, while bran did not show a benefit (Moayyedi 2014). That outcome is IBS symptoms in general, not incomplete evacuation specifically.
• For constipation with an outlet problem, the picture is different. In 149 people with chronic constipation treated with psyllium for at least six weeks at two gastroenterology departments in Munich, 63% of those with a defecation disorder and 80% of those with slow transit did not respond, while 85% of those whose tests were normal improved or became symptom free (Voderholzer 1997).

So if you have tried soluble fibre properly and it made the incomplete feeling worse, as the person who started the main thread described, that is not you doing it wrong. It may be a clue that the problem is at the outlet. Fibre changes are best made gradually and, ideally, with a dietitian, who can also judge whether a low FODMAP trial is worth doing for the rest of your symptoms.

Irrigation: one thread's turning point, thin trial evidence

The person who started the 132-comment thread posted an update a year later saying they were greatly improved, and credited a rectal irrigation device (r/ibs thread). That is one person's experience, and we are reporting it as that.

The research on trans-anal irrigation for chronic constipation is thin. A systematic review found seven studies with 254 patients, all uncontrolled, with response defined differently in each. The pooled response rate was about 50%, with substantial heterogeneity, and adverse events were common but minor (Emmett 2015). Without a control group, a 50% response is hard to interpret. Irrigation is something to discuss with a specialist team who can train you in it, not something to improvise.

For a sensitive rectum: the honest gap

For the false-alarm version, we could find no trial that targeted incomplete evacuation as its main outcome. The treatments with IBS evidence for pain and overall symptoms, including gut-directed psychological therapies and the medicines your clinician might consider, may help, but whether they shift this particular feeling has not, as far as our searching of PubMed and Europe PMC found, been tested directly. That is worth knowing before you spend money on anything that claims otherwise.

For more on the way: time, not effort

If your second urge is the next batch arriving, the most helpful change is usually structural rather than medical: leaving a buffer after waking and after breakfast before you need to leave the house, and not straining to produce a bowel movement that is not ready. If you find yourself staying home or planning routes around this, our post on IBS anxiety about leaving the house covers how that pattern grows and how people unwind it.

The smell, the wiping and the social side

This is the part of the symptom that the threads talk about most and the medical literature talks about least.

The largest r/ibs thread on incomplete evacuation was started by someone who said they could not date or go out because leftover stool left them smelling, despite a bidet, wipes, diet changes, water and laxatives (r/ibs thread). Many replies described the same "infinite wipe" problem. Some suggested trimethylaminuria; others suggested probiotics, diets or supplements. None of those is evidence, and we would not act on any of them without a clinician.

What the research does support is narrower. Seepage and soiling are common alongside this symptom. In the faecal incontinence cohort, weekly soiling was reported by 92% of those with incomplete evacuation and 86% of those without (Sjödahl 2026). In the dyssynergia series, the bowel problem affected social life in 76% and sexual life in 56% (Rao 2004). If leftover stool is leaking or smearing, that is a sign the outlet is not clearing properly, which makes it a reason to be assessed rather than a hygiene failing. Say the words "soiling" and "I have to remove stool with my finger" to your clinician, because those two phrases change what gets offered.

Is it cancer?

On its own, the feeling of incomplete evacuation is not one of the main warning signs of bowel cancer. But a new, persistent change in how your bowels work is always worth reporting, and some symptoms alongside it need a doctor promptly.

The evidence on this is clearer than the internet suggests.

• In a primary care study of 349 people with colorectal cancer aged 40 and over and 1,744 matched controls, the features linked with cancer before diagnosis were rectal bleeding, weight loss, abdominal pain, diarrhoea, constipation, an abnormal rectal examination, abdominal tenderness, anaemia, a positive faecal occult blood test and high blood glucose (Hamilton 2005). Incomplete evacuation and tenesmus do not appear anywhere in the full text we read.
• In a meta-analysis of people diagnosed under 50, the commonest presenting symptoms were rectal bleeding (pooled prevalence 45%), abdominal pain (40%) and altered bowel habits (27%). Rectal bleeding was associated with at least a five-fold increase in risk (Demb 2024). Incomplete evacuation was not among the red flags it reported.

That absence is a finding about what those studies measured, not proof that incomplete evacuation never matters. A tumour low in the rectum can take up space, and a clinician examining you is the person who can check for that. What it does mean is that, without the other features, this symptom on its own is far more likely to be one of the three mechanisms above. If the fear of cancer is driving repeated checking, our post on IBS and health anxiety is written for exactly that loop.

When to see a doctor promptly

See a doctor promptly, rather than waiting, if the incomplete feeling comes with any of these:

• Blood in or on your stool, or black, tarry stool.
• Unexplained weight loss.
• Anaemia, or tiredness and breathlessness that could be anaemia.
• A change that is new and persists, especially if it started after age 50.
• Narrowing of the stool that is new and persistent, or a lump you can feel.
• Symptoms that wake you at night, or fever.
• A family history of bowel cancer or inflammatory bowel disease.
• Severe pain, a swollen abdomen and being unable to pass stool or wind, which needs urgent care the same day.

Also book a routine appointment, without the same urgency, if you regularly have to press or use a finger to finish, if you are soiling, if you spend long periods on the toilet most days, or if fibre and laxatives have not helped. Those are the situations where anorectal testing is most likely to change what you are offered (Rao 2016).

Myths about feeling you still need to go

"A good bowel movement should leave you completely empty." A normal bowel movement empties the rectum partially, about two thirds on average in one small study, and moves only part of what is in the colon (Lubowski 1995). The aim is "done enough", not "empty".

"If you are not finished, push harder." If the problem is an outlet that tightens when you push, pushing harder tightens it further. That is the definition of dyssynergia (Rao 2016).

"Weak pelvic floor muscles cause this, so do Kegels." The more common problem in this symptom is muscles that will not relax. Biofeedback, which trains relaxation and coordination, has done better than pelvic floor exercises in trials (Rao 2016).

"More fibre fixes incomplete emptying." For people with a defecation disorder, 63% did not respond to fibre in one study (Voderholzer 1997). Fibre helps some people with IBS, but it does not open a closed outlet.

"If your stool is soft, it cannot be a pelvic floor problem." Dyssynergia is a coordination problem, and many people with it do not have hard stools (Rao 2004).

"You cannot have dyssynergia if you have IBS." That was effectively the old rule, because earlier criteria excluded IBS. Rome IV dropped it, and studies find dyssynergia frequently in IBS-C (Rao 2016; Suttor 2010).

"A rectocele on a scan explains everything." Rectoceles during defecation are very common in healthy women (Shorvon 1989). They can contribute, but they are often not the whole story.

What to track before your appointment

Incomplete evacuation is a symptom where a short log helps, because it separates the three causes better than memory does. Two weeks is enough. For each bowel movement, note:

• Time of day, and whether it was within an hour of waking or a meal.
• Stool form, using the Bristol scale.
• Did you feel finished? A simple yes, partly or no.
• Did you go back, and how soon? And did anything come?
• Straining, pressing or using a finger, yes or no. These are the details that point to an outlet problem, and the ones people leave out from embarrassment.
• Time on the toilet, roughly.
• Soiling or smearing later in the day.

A pattern like "felt unfinished, went back 20 minutes later, passed a normal amount, only in the morning" points one way. "Felt unfinished, had to press to finish, nothing came on the return trip" points another. Bring the totals, not every entry. Our guide to keeping an IBS food and symptom diary covers the mechanics, and if you use an app, Clairop logs each bowel movement in a few seconds and turns the period into a one-page summary to bring to your appointment.

The honest bottom line

Feeling that you need to go again right after you have been is common in IBS and not rare outside it. It is not one problem. It is a single feeling that three different mechanisms produce: stool that could not get out, a rectum that over-reports, and more stool arriving from above. Only one of those, the outlet that will not relax, has strong trial evidence for a specific treatment, and that treatment is biofeedback, not more laxatives, harder pushing or stronger squeezing. Testing for it is simple, and Rome IV now explicitly allows the diagnosis in people with IBS with constipation.

If you have been told this is "just IBS" and handed another fibre supplement, it is reasonable to ask: "Could this be a pelvic floor coordination problem, and can I have anorectal manometry and a balloon expulsion test?" And if you have blood, weight loss, anaemia or a new change after 50, see a doctor promptly whatever else is going on.