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Health condition · Clinically reviewed

Constipation in children, the withholding cycle - and how NICE CG99 breaks it.

One of the commonest paediatric problems, and one of the most treatable. A calm, family-focused plan works better than any single medicine.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against NICE CG99, BSPGHAN and peer-reviewed sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK guidance including macrogol-based disimpaction and long maintenance schedules.

Key facts

Childhood constipation at a glance.

The essentials, in plain English - how common it is, what type it usually is, and how modern UK paediatric care treats it.

  • How common

    Very common in childhood - around 5 to 30 per cent of children affected at some point, one of the top reasons for paediatric outpatient referral.

  • Types

    Around 95 per cent is functional - no organic cause, driven by behaviour, diet and toileting. The rest is organic and needs a specialist.

  • The withholding cycle

    A single painful stool teaches the child to hold on - the stool then gets harder and more painful, and the cycle locks in.

  • Diagnosis

    Clinical, using Rome IV criteria and NICE CG99 - investigations are not routine unless red flags are present.

  • Foundation therapy

    Movicol Paediatric (a macrogol) for disimpaction then long maintenance, alongside toileting, diet and family support.

  • Refractory disease

    Rectal irrigation (Peristeen), biofeedback, tertiary paediatric gastroenterology and, rarely, surgery for the small minority who do not settle.

Why this guide matters

A calm plan beats a scared child.

Childhood constipation is not naughtiness and it is rarely a rare disease. Three principles carry almost every family through it.

  • Break the withholding cycle first

    Disimpaction with a macrogol clears the blockage so the next stool does not hurt - the fear then fades on its own.

  • Maintenance is measured in months

    A daily macrogol dose kept up for months, slowly tapered, is what prevents relapse. Stopping early is the biggest mistake.

  • Family and routine do the heavy lifting

    Toileting after meals, kind clean-ups and reward for effort - not stool - are as important as any medicine.

How the diagnosis is made

From first consultation to a settled plan.

The steps a UK GP or paediatrician will normally follow, in order - based on NICE CG99 and BSPGHAN standards.

  1. 01

    Assessing

    History and red flags

    Onset, stool pattern, toileting behaviour, diet, medications, development and family or psychosocial context.

  2. 02

    Assessing

    Rome IV symptom check

    A structured symptom framework for functional constipation - infrequent motions, painful stool, soiling and withholding.

  3. 03

    Assessing

    Examination

    Abdomen for faecal loading, spine and lower-limb neurology, perianal inspection - a PR exam is specialist only in children.

  4. 04

    Confirming

    Selective bloods

    Coeliac serology, thyroid function, calcium and full blood count only if the picture suggests an organic cause.

  5. 05

    Confirming

    Imaging - not routine

    A plain abdominal X-ray is not needed to diagnose functional constipation. Imaging is reserved for specific clinical questions.

  6. 06

    Confirming

    Safeguarding and family review

    A quiet check on parental mental health, family stress and safeguarding - all part of good paediatric assessment.

  7. 07

    Referral

    Specialist referral

    Any red flag, refractory disease or suspected organic cause goes to paediatric gastroenterology or paediatric surgery.

Typical timeline: an assessment and disimpaction plan within a week or two, with maintenance over months.

Symptoms

What childhood constipation looks like.

Not just infrequent stools - the giveaway is often withholding, soiling and abdominal pain rather than the frequency itself.

  • Infrequent bowel motions

    Fewer than three stools a week is a common threshold - but any drop from the child’s usual pattern matters.

  • Painful, hard stool

    Large-calibre, hard or pellet-like stool that hurts to pass - often the trigger for withholding.

  • Straining and posturing

    Tiptoeing, crossing legs, hiding behind furniture - classic withholding behaviour, not straining to go.

  • Soiling (overflow)

    Loose stool leaking around a large faecal mass - often mistaken for diarrhoea and easy to miss.

  • Abdominal pain and loading

    Cramping tummy ache, poor appetite and a palpable faecal mass on gentle examination.

  • Fissure and PR bleeding

    A small anal fissure from a hard stool leaves streaks of fresh red blood on the paper or nappy.

  • Irritability and low mood

    Children living with constipation are often tired, tearful or off their food - it lifts fast once treated.

  • Red flag - refer for organic cause

    Symptoms from birth, failure to thrive, ribbon stool, bilious vomiting or any neurological or spinal sign.

Treatment

How constipation is treated in UK children.

Reassurance, macrogol disimpaction, long maintenance, toileting and diet - and specialist input for the small number who need it.

  • Demystify and reassure

    A calm, non-punitive family conversation - the child is not being naughty, and the cycle can be broken.

  • Disimpaction with macrogol

    Movicol Paediatric in escalating doses over one to two weeks to clear the faecal mass, per NICE CG99.

  • Maintenance macrogol

    A daily macrogol dose kept up for months, tapered slowly - stopping too early is the main reason relapse happens.

  • Stimulant laxative

    Senna, sodium picosulphate or bisacodyl added if osmotic alone is not enough - short courses, specialist-guided in young children.

  • Toileting routine

    Sit on the loo after meals to use the gastrocolic reflex, with a step stool for good posture and unhurried time.

  • Diet and fluid

    Adequate fibre, plenty of water, and a review for cow’s milk protein allergy where the picture fits - with dietitian input if needed.

  • Rectal irrigation (Peristeen)

    For refractory or neurogenic bowel - see our guide at /treatments/rectal-irrigation-peristeen/. Delivered by paediatric continence teams.

  • Tertiary specialist care

    Biofeedback, ACE (antegrade continence enema), Hirschsprung surgery (Duhamel, Soave, Swenson) and MDT support for the small minority who need it.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP, paediatrician or paediatric gastroenterologist knows your child and can tell you which parts apply. If you are worried, get seen.

  • NICE. Constipation in children and young people: diagnosis and management (CG99).

  • BSPGHAN. Paediatric constipation guideline and position statements.

  • Rome Foundation. Rome IV criteria for functional gastrointestinal disorders in children.

  • ERIC - the children’s bowel and bladder charity. Family and clinician resources.

Red flags

When to think beyond functional constipation.

Most childhood constipation is functional. These are the features that should trigger paediatric review to exclude an organic cause.

  • Symptoms from birth or the first weeks

    Constipation present from birth or in the neonatal period suggests an organic cause - Hirschsprung disease, anorectal malformation or spinal problem.

  • Delayed passage of meconium

    A term baby who has not passed meconium in the first 48 hours needs urgent paediatric review to exclude Hirschsprung disease.

  • Failure to thrive

    Poor weight gain or growth alongside constipation points to coeliac disease, hypothyroidism or another systemic condition.

  • Ribbon-like stool

    A persistently narrow, ribbon-shaped stool can suggest an anorectal or Hirschsprung-related problem and warrants specialist review.

  • Bilious vomiting

    Green vomit in any child is an emergency - it can signal bowel obstruction and needs immediate hospital assessment.

  • Abnormal abdominal or perianal exam

    Distension, a mass, or abnormal perianal anatomy needs paediatric review before treating as functional constipation.

  • Neurological or spinal signs

    Leg weakness, gait change, a sacral dimple or hair tuft can point to spina bifida or a tethered cord - specialist referral.

  • Safeguarding concerns

    Constipation can be a marker of neglect, distress or child abuse - assessment is always broader than the bowel alone.

  • Refractory disease

    Constipation that will not settle on optimal NICE CG99 treatment deserves tertiary paediatric gastroenterology input.

Living with it

A treatable condition, with a family plan.

Four things that make the biggest difference day to day - kindness, routine, persistence with maintenance, and asking for help early.

A quiet reminder

Reward the effort, never the outcome.

A child cannot always control when a stool arrives - they can control sitting on the loo. Praise the sitting, not the stool.

  1. 01 Kindness

    Never punish accidents

    Soiling is not deliberate - it is overflow around a blocked bowel. Calm, matter-of-fact clean-ups protect the child’s confidence.

  2. 02 Routine

    Sit after every meal

    Five to ten unhurried minutes on the loo after breakfast, lunch and tea uses the gastrocolic reflex - a step stool helps posture.

  3. 03 Persist

    Keep the macrogol going

    Maintenance is measured in months, not weeks. Stopping the moment things improve is the commonest cause of relapse.

  4. 04 Escalate

    Ask for help early

    If things are not settling, ask for a paediatric referral - continence nurses, dietitians and ERIC can make a real difference.

Frequently asked

Everything parents ask about childhood constipation.

Quick answers on withholding, Movicol, red flags and what to do when things do not settle.

  • What is constipation in children?

    Difficulty passing stool, hard or infrequent stools, or a painful, distressing pattern of going to the loo. In children the diagnosis is clinical, using Rome IV criteria, and around 95 per cent of cases are functional with no organic cause.

  • Why is my child holding on?

    Withholding is the central mechanism. One painful stool teaches the child that going hurts, so they hold on. The stool then gets larger and harder, the next attempt hurts more, and the cycle locks in. Breaking that cycle is what treatment is designed to do.

  • Is Movicol Paediatric safe long-term?

    Yes - macrogol (Movicol Paediatric) is the NICE CG99 first-line treatment for both disimpaction and long maintenance. It is not absorbed and is safe for months of use. Stopping too soon is the main cause of relapse.

  • When should I worry about an organic cause?

    Red flags include symptoms from birth, delayed passage of meconium beyond 48 hours, failure to thrive, ribbon-like stool, bilious vomiting, abnormal perianal or neurological findings, or constipation that will not settle on standard treatment. Any of these deserves specialist review.

  • Do we need blood tests or an X-ray?

    Usually no. NICE CG99 says blood tests (coeliac serology, thyroid function, calcium, FBC) are only selective, and a plain abdominal X-ray is not routinely needed to diagnose functional constipation.

  • What if the standard plan is not working?

    Refractory constipation deserves referral to paediatric gastroenterology. Options include rectal irrigation such as Peristeen, biofeedback, dietitian input for suspected cow’s milk protein allergy, and - rarely - surgery including antegrade continence enema (ACE) or Hirschsprung-related procedures.

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