Pelvic floor: when stool won’t come out properly

Why straining sometimes does not help, how a defecation disorder shows itself and why biofeedback works better than laxatives.

How solid is the research? Well supported

Well established: biofeedback helps much more than laxatives for a pelvic floor defecation disorder, and the guideline recommends it as first treatment. The tips on toilet posture are based on smaller studies.

Cause or consequence? Cause and consequence

The pelvic floor helps decide whether stool comes out. Its problems follow from weak connective tissue and births, and are themselves a cause of constipation.

Healthy state

The exit of the gut consists of several layers that work together. The rectum is the store where stool collects. At the transition to the anus, the puborectalis muscle, which lies like a sling around the rectum, keeps the bowel bent. This bend is our most important brake. In addition there are two sphincters: an inner one that we cannot control and an outer one that we tighten at will. The pelvic floor is the muscle plate below, which carries bladder, uterus or prostate, and rectum.

When the rectum fills, stretch sensors in the wall report pressure. The inner sphincter reflexively opens a small gap and lets the contents be sampled to feel whether it is stool or gas. We feel the urge and decide whether now is the right moment. If not, the outer sphincter tightens, the urge fades, and the stool is pushed back a little. If this is done constantly, the sensitivity of the rectum falls over time, and the urge comes later and quieter.

For stool to leave the bowel, several muscles must work together. The abdomen presses gently while the anal sphincter and the pelvic floor relax. A muscle that bends the rectum like a sling lets go. The path straightens and the stool slides out without hard straining.

Whether this works depends not only on the stool but on this coordination. It is partly learned, like walking or swallowing, and can be learned again.

A defecation disorder can be tested well: in the balloon expulsion test, a small water-filled balloon in the rectum is pushed out. In anorectal manometry, a probe shows whether the muscles relax when pushing. In a Meta-analysis An analysis that combines the results of several studies. It is only as good as the studies it includes. , both tests detected about three in four people affected. They can also be abnormal in some people without a defecation disorder, so they are interpreted together with the symptoms and the examination.

During a bowel movement the pelvic floor relaxes, the rectum straightens and the way is clear.

Disrupted state: causes and effects

In a defecation disorder, which experts call dyssynergia, the pelvic floor and sphincter tighten instead of relaxing when pushing. It is like pushing against a closed door. Typical signs are hard straining even with soft stool, a feeling of not being empty, a sense of blockage and helping with pressure on the perineum or with the fingers.

The Rome V criteria Internationally used criteria with which experts classify IBS, functional constipation and stomach complaints based on symptoms. Rome V (2026) is the current version; it replaced the Rome IV criteria of 2016. More in the chapter “The gut-brain axis” for constipation include exactly these signs. People who have them often benefit little from more fibre, because the problem is not the stool but the exit.

Long straining on the toilet can promote haemorrhoids and anal fissures, and fear of pain increases the tension further. This easily creates a vicious circle.

The pelvic floor is not a single muscle that only needs to be “strengthened”. It must also be able to relax. People who tense a lot in daily life (pulling in the belly, stress, pain, sport with constant tension) cannot let go of this tension on the toilet either. Some learned as children to hold stool back, for example after painful bowel movements. The brain remembers the pattern, and it often stays into adulthood.

Sometimes it is also about structure. With childbirth, age, menopause, heavy lifting and congenitally weak connective tissue, the wall of the rectum can bulge into the vagina (rectocele), the rectum can fold into itself (intussusception), or the pelvic floor can descend too far when pushing. Then stool gets stuck in the pouch, and people help with their fingers in the vagina or at the perineum. Such findings can be seen with an X-ray or MRI examination of emptying (defecography). They are not always the cause; many people without symptoms also have small rectoceles. In Irritable bowel syndrome Recurring abdominal pain linked to bowel movements, without tests finding another cause. Today it is understood as a disorder of gut–brain interaction. More in the chapter “The gut-brain axis” with constipation, a defecation disorder additionally lies behind it in some people, which makes the advice “more fibre” fall flat.

In a defecation disorder the pelvic floor tightens when pushing. The path stays bent.

Where it comes from and where it leads

The same symptoms can have different roots. This map shows what may be involved in this problem and what may follow from it.

Possible causes
This problem
Possible consequences

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Connections, not certainty: a link means “can”, not “must”. What applies to you is best clarified in a talk with your doctor.

What often helps

Lifestyle

Diet, exercise, sleep, social contact and dealing with stress.

Feet up: a stool in front of the toilet With your feet on a footstool and leaning slightly forward, the rectum straightens. In 52 healthy people, bowel movements were shorter, with less straining and more often a feeling of complete emptying. Plausible How we rate the evidence Established Recommended in medical guidelines or supported by several consistent meta-analyses of randomised human studies. Well supported Several randomised studies in humans with largely consistent results. Promising Single randomised or controlled studies in humans, not yet independently confirmed — or many consistent observational studies. Plausible Two cases: first observational or pilot studies with small samples — or a settled basis that is not in dispute, such as movement, sleep or meal pauses. But not tested in humans for symptoms. Experimental Barely studied in humans. Mainly lab and animal studies or theoretical reasoning; whether it helps is open. [1]
Don’t strain, let go Breathe into your belly, let it bulge gently outwards and consciously relax the pelvic floor. Don’t sit for more than a few minutes; try again later instead. Plausible How we rate the evidence Established Recommended in medical guidelines or supported by several consistent meta-analyses of randomised human studies. Well supported Several randomised studies in humans with largely consistent results. Promising Single randomised or controlled studies in humans, not yet independently confirmed — or many consistent observational studies. Plausible Two cases: first observational or pilot studies with small samples — or a settled basis that is not in dispute, such as movement, sleep or meal pauses. But not tested in humans for symptoms. Experimental Barely studied in humans. Mainly lab and animal studies or theoretical reasoning; whether it helps is open. [2]
A set time after breakfast The bowel is most active after eating. A set toilet time in the morning with good posture clearly increased the number of complete bowel movements in a small study. Plausible How we rate the evidence Established Recommended in medical guidelines or supported by several consistent meta-analyses of randomised human studies. Well supported Several randomised studies in humans with largely consistent results. Promising Single randomised or controlled studies in humans, not yet independently confirmed — or many consistent observational studies. Plausible Two cases: first observational or pilot studies with small samples — or a settled basis that is not in dispute, such as movement, sleep or meal pauses. But not tested in humans for symptoms. Experimental Barely studied in humans. Mainly lab and animal studies or theoretical reasoning; whether it helps is open. [3]
Soft stool makes it easier Drinking enough and fibre give stool that is easier to pass. This does not fix the defecation disorder, but takes pressure off. Promising How we rate the evidence Established Recommended in medical guidelines or supported by several consistent meta-analyses of randomised human studies. Well supported Several randomised studies in humans with largely consistent results. Promising Single randomised or controlled studies in humans, not yet independently confirmed — or many consistent observational studies. Plausible Two cases: first observational or pilot studies with small samples — or a settled basis that is not in dispute, such as movement, sleep or meal pauses. But not tested in humans for symptoms. Experimental Barely studied in humans. Mainly lab and animal studies or theoretical reasoning; whether it helps is open. [4]
Don’t strengthen by reflex If you have a defecation disorder and do pelvic floor exercises of the “tighten and hold” type (Kegel exercises), you may increase the tension. The goal is coordination: being able to let go on purpose. First have someone show you whether your pelvic floor is too weak, too tense or both. Plausible How we rate the evidence Established Recommended in medical guidelines or supported by several consistent meta-analyses of randomised human studies. Well supported Several randomised studies in humans with largely consistent results. Promising Single randomised or controlled studies in humans, not yet independently confirmed — or many consistent observational studies. Plausible Two cases: first observational or pilot studies with small samples — or a settled basis that is not in dispute, such as movement, sleep or meal pauses. But not tested in humans for symptoms. Experimental Barely studied in humans. Mainly lab and animal studies or theoretical reasoning; whether it helps is open.

Natural supplements

Supplements do not replace a medical check-up. Discuss dosage and interactions with your doctor or pharmacist.

Psyllium husk It makes stool softer and smoother. The guideline conditionally recommends fibre for chronic constipation. Increase slowly and drink plenty. Promising How we rate the evidence Established Recommended in medical guidelines or supported by several consistent meta-analyses of randomised human studies. Well supported Several randomised studies in humans with largely consistent results. Promising Single randomised or controlled studies in humans, not yet independently confirmed — or many consistent observational studies. Plausible Two cases: first observational or pilot studies with small samples — or a settled basis that is not in dispute, such as movement, sleep or meal pauses. But not tested in humans for symptoms. Experimental Barely studied in humans. Mainly lab and animal studies or theoretical reasoning; whether it helps is open. [4]

Medical treatments

Information, not a treatment recommendation. Decide together with a doctor. Approval and availability differ from country to country.

Get a defecation disorder checked If you strain a lot or help with your fingers, mention it. If a defecation disorder is suspected, the guideline recommends a balloon expulsion test and anorectal manometry; a digital examination often gives a first clue. Well supported How we rate the evidence Established Recommended in medical guidelines or supported by several consistent meta-analyses of randomised human studies. Well supported Several randomised studies in humans with largely consistent results. Promising Single randomised or controlled studies in humans, not yet independently confirmed — or many consistent observational studies. Plausible Two cases: first observational or pilot studies with small samples — or a settled basis that is not in dispute, such as movement, sleep or meal pauses. But not tested in humans for symptoms. Experimental Barely studied in humans. Mainly lab and animal studies or theoretical reasoning; whether it helps is open. [2][5]
Biofeedback training With a probe, you see on a screen what your muscles do when pushing and learn to relax them properly. After 6 months, 80 percent with biofeedback reported major improvement, but only 22 percent with laxatives. The effect lasted at least 2 years. Established How we rate the evidence Established Recommended in medical guidelines or supported by several consistent meta-analyses of randomised human studies. Well supported Several randomised studies in humans with largely consistent results. Promising Single randomised or controlled studies in humans, not yet independently confirmed — or many consistent observational studies. Plausible Two cases: first observational or pilot studies with small samples — or a settled basis that is not in dispute, such as movement, sleep or meal pauses. But not tested in humans for symptoms. Experimental Barely studied in humans. Mainly lab and animal studies or theoretical reasoning; whether it helps is open. [6][7][2]
Biofeedback at home Training with a small device at home worked almost as well as in the clinic in one study: 68 versus 70 percent responded. Ask whether this is offered in your country. Promising How we rate the evidence Established Recommended in medical guidelines or supported by several consistent meta-analyses of randomised human studies. Well supported Several randomised studies in humans with largely consistent results. Promising Single randomised or controlled studies in humans, not yet independently confirmed — or many consistent observational studies. Plausible Two cases: first observational or pilot studies with small samples — or a settled basis that is not in dispute, such as movement, sleep or meal pauses. But not tested in humans for symptoms. Experimental Barely studied in humans. Mainly lab and animal studies or theoretical reasoning; whether it helps is open. [8]
Laxatives as a bridge The guideline strongly recommends macrogol and sodium picosulfate for chronic constipation. They make daily life easier but do not replace training for a defecation disorder. Well supported How we rate the evidence Established Recommended in medical guidelines or supported by several consistent meta-analyses of randomised human studies. Well supported Several randomised studies in humans with largely consistent results. Promising Single randomised or controlled studies in humans, not yet independently confirmed — or many consistent observational studies. Plausible Two cases: first observational or pilot studies with small samples — or a settled basis that is not in dispute, such as movement, sleep or meal pauses. But not tested in humans for symptoms. Experimental Barely studied in humans. Mainly lab and animal studies or theoretical reasoning; whether it helps is open. [4]
Clarify structural causes If stool gets stuck despite soft stool and training, or you have to help with your fingers, defecography (X-ray or MRI of emptying) can show whether a rectocele or intussusception plays a part. The finding must be interpreted together with the symptoms. Promising How we rate the evidence Established Recommended in medical guidelines or supported by several consistent meta-analyses of randomised human studies. Well supported Several randomised studies in humans with largely consistent results. Promising Single randomised or controlled studies in humans, not yet independently confirmed — or many consistent observational studies. Plausible Two cases: first observational or pilot studies with small samples — or a settled basis that is not in dispute, such as movement, sleep or meal pauses. But not tested in humans for symptoms. Experimental Barely studied in humans. Mainly lab and animal studies or theoretical reasoning; whether it helps is open. [2]
Pelvic floor physiotherapy Specialised physiotherapists practise with you how to coordinate breathing, abdominal pressure and pelvic floor, often with biofeedback. The guideline names biofeedback training as the preferred treatment for a defecation disorder. Ask about services near you; they are not available everywhere. Well supported How we rate the evidence Established Recommended in medical guidelines or supported by several consistent meta-analyses of randomised human studies. Well supported Several randomised studies in humans with largely consistent results. Promising Single randomised or controlled studies in humans, not yet independently confirmed — or many consistent observational studies. Plausible Two cases: first observational or pilot studies with small samples — or a settled basis that is not in dispute, such as movement, sleep or meal pauses. But not tested in humans for symptoms. Experimental Barely studied in humans. Mainly lab and animal studies or theoretical reasoning; whether it helps is open. [2]

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How we rate the evidence

Trust score 5 of 5:Established: Recommended in medical guidelines or supported by several consistent meta-analyses of randomised human studies.
Trust score 4 of 5:Well supported: Several randomised studies in humans with largely consistent results.
Trust score 3 of 5:Promising: Single randomised or controlled studies in humans, not yet independently confirmed — or many consistent observational studies.
Trust score 2 of 5:Plausible: Two cases: first observational or pilot studies with small samples — or a settled basis that is not in dispute, such as movement, sleep or meal pauses. But not tested in humans for symptoms.
Trust score 1 of 5:Experimental: Barely studied in humans. Mainly lab and animal studies or theoretical reasoning; whether it helps is open.

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