Learning to coordinate these muscles can take practice and correction. Some people improve a lot, some partly, and some need a different treatment. Not improving doesn't mean you have failed.

It can mean:

• the exercise target needs changing
• the technique needs supervised correction
• stool consistency still needs attention
• slow movement through the bowel (slow transit)
• a structural emptying problem
• a change in rectal sensation
• pain or inflammation
• other medical factors

Ask for a review if the exercises are painful, confusing, not helping after several weeks, or making things worse. The answer isn't always more exercises.

What is biofeedback, and why can it help?

The muscles and sensations involved in emptying are hidden: you can't see whether your bottom is relaxing or tightening. Specialist biofeedback makes them visible, as pressures, muscle activity or rectal filling on a screen, so you and your therapist can see what is happening.

It can show whether you are:

• making an effective push
• relaxing the outlet when trying to empty
• tightening when you mean to relax
• noticing rectal filling at the right time

Learning to coordinate these muscles is a little like learning a new movement. Feedback helps you understand what is happening and practise the right skill.

The equipment provides feedback. The therapist helps you understand it and learn the right skill.

This website illustrates the principles, but it can't measure what your muscles are doing. Its animations are not biofeedback.

Tests and equipment you may come across

• Anorectal manometry: measures pressures, coordination, sensation and a normal reflex.
• Balloon expulsion test: sitting on a toilet in private, you try to pass a small balloon from the back passage, following your clinic's protocol. The result is interpreted together with your history and your other tests.
• EMG (surface electrodes): shows muscle activity around the back passage; sometimes used during biofeedback.
• Pressure-based biofeedback: a soft probe shows pressures as you push and relax.
• Rectal sensation testing: gentle balloon filling to see when you feel it.
• Defecography: imaging while you empty, to show structure and movement.

F3 Dyssynergic defecation

Rome V lists dyssynergic defecation separately and removes the broader Rome IV category of functional defecation disorders. It requires symptoms of difficult evacuation (for example straining or digital manoeuvres) with at least a quarter of bowel movements, criteria fulfilled for the last 3 months with symptom onset at least 6 months before diagnosis, plus at least one qualifying abnormal evacuation finding on anorectal manometry, balloon expulsion testing or defecography, judged against appropriate norms. Rome IV required two. Rome V gives the diagnostic criteria; the London Classification describes how manometric coordination is interpreted together with an evacuation test. EMG is no longer included, and manometric diagnosis relies on more specific patterns of abnormal evacuation. Inadequate propulsion is no longer kept as a separate formal subtype; on this site, "weak push" and "the outlet tightens" are training targets, not diagnoses.

A dyssynergic manometric pattern on its own is not invariably pathological: it is common in asymptomatic people and is influenced by posture and test conditions. Interpret it alongside symptoms and the balloon expulsion test. Manometry remains essential for sphincter pressures, rectoanal coordination, rectal sensation and the rectoanal inhibitory reflex; the balloon expulsion test adds functional information about evacuation, and defecography can show structural or dynamic abnormalities.

Interpreting manometry: the London Classification

The London Classification (IAPWG, 2020) describes manometric findings in standardised terms and places them in a hierarchy, and it stresses that evacuation findings on manometry should be interpreted together with the balloon expulsion test. Rome V F3 accepts one abnormal qualifying test, but that does not remove the need for clinical interpretation or resolve the known ambiguities of manometry. An isolated negative rectoanal pressure gradient is common in healthy people and is not on its own definitive evidence of clinically significant dyssynergia. Inadequate propulsion is no longer a separate Rome V subclass, but it remains a valid therapeutic target. Manometry does not identify rectocele, intussusception or other structural disorders; examination and defecography are needed.

F4 Anorectal sensory dysfunction

F4a rectal hyposensitivity and F4b rectal hypersensitivity require compatible anorectal symptoms and objectively abnormal rectal sensory thresholds on rectal distension; neither is diagnosed from the presence or absence of urgency alone. Both require the qualifying symptom criteria (faecal incontinence or dyssynergic defecation symptoms, as specified in Rome V). F4a: at least two abnormally high sensory thresholds; structural disease and metabolic abnormalities excluded. F4b: at least one qualifying abnormally low threshold; first or constant sensation does not count as a qualifying threshold; prior rectal excision and structural disease excluded. Check exact reference limits and method caveats against the Rome V anorectal paper and laboratory-specific norms.

Urgency alone does not establish F4b. Reduced rectal compliance or capacity (for example after proctitis) lowers volume-based thresholds mechanically, without primary afferent hypersensitivity.

Thresholds depend on method: balloon volume versus barostat pressure, balloon type and inflation protocol. Rectal compliance matters: a capacious, highly compliant rectum can raise volume-based thresholds without primary afferent dysfunction, and a stiff rectum can lower them. Pressure-based (barostat) testing partly corrects for this. Use laboratory-specific normal values.

Validated patient-reported measures include PAC-SYM (constipation symptoms), PAC-QOL (constipation-related quality of life), obstructed defecation scores such as the Altomare ODS score, the St Mark's (Vaizey) incontinence score, and a patient global impression of improvement. The goal and "what has changed?" reflection on this site are informal prompts for conversation, not a validated instrument or score.