Enuresis and daytime wetting

• Bedwetting (nocturnal enuresis) is involuntary urination during sleep. It is one of the commonest reasons children are brought to a clinician, and the child is never to blame.
• The useful medical split is monosymptomatic bedwetting (only wet nights, no daytime symptoms) versus non-monosymptomatic bedwetting (bedwetting plus daytime urgency, frequency, pain or wetting), which points to a bladder problem rather than delayed maturation.
• Most children with monosymptomatic bedwetting grow out of it at about 15% per year, but treatment is reasonable when the child, the family and a motivated clinician can work together. ^[1]
• First-line active treatment for monosymptomatic bedwetting is the enuresis alarm, after advice on fluids, toileting and a reward system have failed. Desmopressin is the drug of choice, taken at bedtime, with strict evening fluid restriction. ^{[2][4] [3]}
• Daytime wetting should be assessed and usually treated before the night-time wetting when it predominates, because its causes (overactive bladder, dysfunctional voiding, constipation, anatomy) need a different plan.

By the end of this page you should be able to:

1. Define enuresis and distinguish primary from secondary nocturnal enuresis and monosymptomatic from non-monosymptomatic bedwetting.
2. Give the main pathophysiological mechanisms of nocturnal enuresis and the size of the genetic contribution.
3. List the red flags in a child who wets, by day or night, and explain the assessment that separates simple bedwetting from a medical disorder.
4. Write a complete management plan for a child with monosymptomatic bedwetting, including alarm and desmopressin dosing, fluid restriction and follow-up.
5. Describe the causes of daytime wetting and the stepwise urotherapy used to treat it.
6. Explain the roles of anticholinergics, tricyclics, constipation treatment and sleep apnoea management, and when to refer.

The condition is common: about 15% of 5-year-olds still wet the bed, boys about twice as often as girls, and roughly 1% to 2% continue into adulthood.^[1] International bodies, including the International Children's Continence Society, classify it into monosymptomatic nocturnal enuresis (MNE), where there are no daytime lower urinary tract symptoms and no history of bladder dysfunction, and non-monosymptomatic nocturnal enuresis (NMNE), where wet nights occur alongside daytime urgency, frequency, wetting, holding manoeuvres, hesitancy, straining, pain or dribbling.^{[1] [4]}

Clinicians also split both types by onset:

• Primary enuresis: the child has never achieved 6 consecutive months of dry nights. This is the majority.
• Secondary enuresis: wetting returns after at least 6 months of dryness. It accounts for roughly one quarter of cases, rises in proportion with age, and should prompt a search for a trigger.^[1]

Bedwetting is a symptom, not a diagnosis. The wet night is the visible end of a chain that can involve small bladder capacity, nocturnal polyuria, failure to wake to a full bladder, constipation, sleep disturbance and, less often, a physical disorder.^[1]

• By age 4, about 25% of children experience frequent bedwetting; by age 5, about 15%; by age 8, about 4%.^[1]
• Bedwetting on fewer than 2 nights a week has a prevalence of 21% at 4.5 years and 8% at 9.5 years. More frequent bedwetting has a prevalence of 8% at 4.5 years and 1.5% at 9.5 years.^[2]
• Monosymptomatic bedwetting resolves spontaneously in roughly 15% of children per year. Children who wet every single night are more likely to continue into adolescence.^[1]
• About 5% of children are still affected at age 10, and 1% to 2% into adulthood.^[1]
• Boys are affected roughly twice as often as girls.^[1]
• Secondary enuresis accounts for around 25% of cases and becomes more common as children get older.^[1]
• Around one in three to one in two children with bedwetting has constipation, and about 20% of children with nocturnal symptoms also have daytime symptoms.^[1]
• Children with enuresis more often have mental health problems than children who do not wet, with attention deficit hyperactivity disorder the most commonly cited comorbidity.^[1]
• Heritability is strong: a child with 1 affected parent has about a 44% chance of developing enuresis, and with 2 affected parents about 77%. Only 15% of children of unaffected parents develop it, and monozygotic twin concordance is about 68%.^[1]
• Bedwetting is similar in prevalence across cultures, and about one third to one quarter of parents have punished a child for wetting, which worsens outcomes.^[1]

Three mechanisms do most of the work, and more than one is usually present.^[1]

1. Nocturnal polyuria. Most people make roughly half as much urine at night as by day. In many children with bedwetting, this circadian reduction is missing, so they produce large volumes of dilute overnight urine, often linked to reduced nocturnal arginine vasopressin release or response.^[1]
2. Reduced functional bladder capacity. Normal bladder capacity is about 60 mL at birth and rises by about 30 mL per year until age 10. Children with enuresis often have a smaller functional capacity than peers, so the bladder fills sooner.^[1]
3. Failure to wake. Children with bedwetting have a higher arousal threshold during sleep and do not wake to bladder filling or detrusor contraction.^[1] Reduced secretion or response of arginine vasopressin does not by itself explain why they fail to wake.^[1]

Other mechanisms include detrusor overactivity, delayed central nervous system maturation (with associations with slower language and gross motor development), obstructive sleep apnoea (which through recurrent apnoeas raises arousal threshold and triggers natriuretic peptide release and therefore polyuria), constipation (rectal distension pressures the bladder and impairs emptying), sickle cell disease (urinary concentrating defect), arginine vasopressin resistance, pinworm irritation, lower urinary tract infection, and structural abnormalities such as posterior urethral valves and ectopic ureter.^[1]

Genetic factors are substantial, as described above, with an autosomal dominant form linked to chromosome 13q13-q14.3 in some families and a penetrance of about 90%.^[1]

Primary enuresis is the delayed-maturation picture: no 6-month dry period ever achieved, often nocturnal polyuria plus small capacity plus deep sleep. Secondary enuresis follows 6 months or more of dryness and often maps onto a trigger. Recognised triggers include constipation and soiling, a stressful life event (parental separation, a new sibling, bereavement), urinary tract infection, diabetes, obstructive sleep apnoea, seizure disorder, chronic kidney disease, primary polydipsia, pinworms, medication effects and psychosocial stress.^[1]

The split is the most useful in practice.

A bedwetting severity note from NICE guidance: bedwetting every night is more severe and less likely to resolve spontaneously than infrequent bedwetting, and large-volume wetting in the first few hours of the night is the typical pattern of bedwetting alone, whereas variable small volumes several times a night suggest bedwetting with daytime symptoms.^[2]

A child who wets is usually healthy. Concern should rise when any of the following appear, because they point away from simple monosymptomatic bedwetting toward disease or maltreatment:

• Onset in the last few days or weeks, or a new change in pattern, which can be a presentation of systemic illness.^[2]
• Weight loss with thirst and an increased appetite, pointing to diabetes mellitus; polyuria and polydipsia with very dilute first-morning urine point to arginine vasopressin disorders (diabetes insipidus).^[1]
• Dysuria, frequency, haematuria, perineal pain or malodorous urine, pointing to urinary tract infection or cystitis.^[1]
• Straining, a weak or interrupted stream, or pain passing urine, which (especially in a boy) may indicate posterior urethral valves or another obstruction.^[1]
• Soaking wetness between voids in a girl (persistent damp pants rather than discrete wet patches), which may be an ectopic ureter.^[1]
• Recurrent urinary tract infections, a known urological or neurological disorder, or a history suggestive of it.^[2]
• Constipation or soiling (present in perhaps one third to one half of children with bedwetting), because chronic constipation is one of the commonest tractable causes.^[1]
• Snoring, mouth breathing, pauses in breathing, restless sleep or night sweats, which suggest obstructive sleep apnoea; bedwetting often resolves after adenotonsillectomy in these children.^[1]
• Neurological or gait abnormalities, lower-limb asymmetry, or sacral skin markers (dimples, hair tufts, haemangiomas, pigmentation changes), which warrant lumbosacral spine imaging.^[1]
• A secondary onset in older childhood or adolescence with palpitations, syncope or sudden death in the family, where long QT syndrome and other cardiac causes deserve thought.^[1]
• Secondary daytime wetting or secondary bedwetting that persists despite adequate assessment and management, unless there is a medical explanation such as infection or a clearly identified stressor such as bereavement or parental separation. This is a recognised trigger to consider maltreatment.^[2]
• Deliberate bedwetting, or parents punishing a child for wetting despite professional advice that it is involuntary, which again raises maltreatment concerns.^[2]

A single new-onset episode of bedwetting after puberty is not a normal variant and deserves a more thorough medical look, including cardiac history and possibly an electrocardiogram.^[1]

NICE guidance structures the assessment around the bedwetting itself, the daytime symptoms, toileting patterns and fluids, plus comorbidities.^[2]

• Has it started in the last few days or weeks (possible systemic illness)?^[2]
• Was the child previously dry for 6 months or longer (secondary enuresis); if so, what medical, emotional or physical trigger might be present?^[2]
• How many nights per week, how many times per night, what time of night, approximately how large a volume, and does the child wake afterwards?^[2]
• Has the child ever been continent at night for 6 consecutive months? This distinguishes primary from secondary.

Screen for all of the following, because each re-classifies the problem and changes treatment.^[2]

• Daytime frequency of more than seven voids per day. ^[2]
• Daytime urgency.
• Daytime wetting.
• Passing urine infrequently, that is fewer than four times a day.
• Straining, a poor stream or hesitancy.
• Pain passing urine.^[2]

Also ask whether daytime symptoms occur only in some settings (for example, only at school), because withholding at school is a common mimic of incontinence, and whether the child has normal access to toilets.^[2]

• What does the child drink, how much, and when; are fluids restricted anywhere, which can mask an overactive bladder and impede development of adequate bladder capacity.^[2]
• A voiding diary and fluid intake diary, which often makes the diagnosis on its own, recording volumes and timing of daytime voids.^[1]
• Stool and bowel history: fewer than 2 bowel motions per week, hard or bulky stools, straining, pain, soiling, or needing to push, all point to constipation, which commonly coexists.^[1]
• Sleep history: snoring, mouth breathing, apnoeas, restless sleep, sleepwalking or night terrors.^[1]
• Family history of enuresis, and the genetic loading described above.^[1]
• Developmental, behavioural and social history (ADHD, autism, learning difficulty, family stress, bullying), because roughly one in five children with nocturnal symptoms also has daytime symptoms and about one third to one half has constipation.^[1]
• What has already been tried, and what the child and family hope to achieve. Clarify whether short-term dryness for events such as sleepovers is the priority.^[2]
• Whether the child and family have the time, space and motivation to use an alarm, and sleeping arrangements (own bed, own room, who is available to help).^[2]
• Where the family is struggling emotionally, the level of blame or negativity in the household matters, both clinically and for safety.^[2]

An 8-year-old boy wets 5 nights a week, large volumes soon after falling asleep. He is otherwise healthy, opens his bowels every 3 days with hard stools, and is a deep sleeper who snores lightly. His mother wets the bed until age 11. His daytime voiding diary shows 4 large voids per day, no urgency and no daytime wetting. He has constipation and monosymptomatic enuresis with a maternal history and a deep-sleep tendency; treating his constipation and using either desmopressin for a sleepover or an alarm for long-term cure are both reasonable.

Most children with MNE have a normal examination. Abnormal findings usually point to a cause. Look for:

• Abdominal mass or visible bowel loops: constipation, urinary retention.
• Growth chart, blood pressure: chronic kidney disease and endocrine disease.
• Tonsillar hypertrophy, mouth breathing, nasal obstruction: obstructive sleep apnoea.^[1]
• Genital examination: hypospadias, phimosis, labial adhesions, ectopic ureter in girls (moist, excoriated vulva), signs of soiling.
• Spine and sacrum: dimples, hair tufts, haemangiomas, lipomas, pigmentation changes, gait or lower-limb neurological abnormality, all of which raise spinal dysraphism.^[1]
• Neurodevelopmental and psychological status, and signs of psychosocial distress in the family.
• Body habitus and any focal neurological deficits.

Perform a urinalysis where indicated (see Investigations). Digital rectal examination is not part of routine paediatric assessment; constipation is usually diagnosed clinically and sometimes with plain abdominal radiography if there is genuine doubt.

NICE recommends that urinalysis is not routine in children with bedwetting, unless any of the following apply: bedwetting started within the last few days or weeks; there are daytime symptoms; there are signs of ill health; there is a history, symptoms or signs of urinary tract infection; or there is a history, symptoms or signs of diabetes mellitus.^[2]

StatPearls practice, drawn from international childhood continence consensus, is somewhat broader: urinalysis to screen for glucose, infection and renal disease, and a random or first-morning specific gravity greater than 1.020 effectively rules out arginine vasopressin disorders.^[1]

First-line and screening:

• Urinalysis (dipstick): glucose, protein, blood, leucocyte esterase, nitrites, specific gravity.
• Voiding diary and fluid intake diary, which often makes the diagnosis on its own.^[1]
• Urine culture if infection is suspected; recurrent infection warrants imaging such as renal ultrasonography and voiding cystourethrography.^[1]

Second-line, used when daytime symptoms, atypical features or comorbidities are present:^[1]

• Renal ultrasonography for children with daytime symptoms, a history of urinary tract infection, or evidence of structural abnormality.
• Voiding cystourethrography where structural disease is suspected.
• Magnetic resonance imaging of the lumbosacral spine for lower-limb neurological or gait abnormalities, or sacral skin markers, to exclude spinal dysraphism.
• Plain abdominal radiography where constipation is genuinely suspected and treatment is not progressing.
• Sleep study (polysomnography) for children with symptoms of obstructive sleep apnoea. Absence of snoring does not exclude it.
• Electrocardiogram and cardiac family history for secondary enuresis of new onset in an adolescent or young adult, given rare case reports of sudden death preceded by isolated enuresis and possible long QT syndrome.^[1]

Imaging is deliberately kept in reserve for MNE itself: a normal child with simple bedwetting does not need a scan.

There is no laboratory test for bedwetting. Diagnosis is clinical:

• MNE: child 5 years or older, wetting during sleep at least twice weekly for at least 3 months, or wetting causing distress or impairment, with no daytime lower urinary tract symptoms.^[1]
• NMNE: the same wetting criteria plus at least one daytime symptom (urgency, frequency, daytime wetting, hesitancy, straining, pain, dribbling or infrequent voiding).^[1][2]
• Primary and secondary definitions as above.^[1]

A 2026 Chinese expert consensus (Delphi, 42 multidisciplinary panelists) proposed a slightly lighter threshold of at least one involuntary void per month for 3 months in children aged 5 years or older, reminding us that case definitions vary between guidelines and that a consistent impairment-based approach is safer than an arbitrary count.^[4] Children aged under 5 are managed on developmental age and constipation rather than on these thresholds; roughly one in five children of 4.5 years wets the bed at least once a week, and this is usually physiological.^[2]

Address the reversible precipitants first, then the child and family's goals, then active therapy.^[2]

• Reassure: bedwetting is not the child's fault and not the parent's fault. Punishment is ineffective and harmful and should be explicitly discouraged; case reports include fatal abuse linked to wetting.^[1]
• Fluids: adequate daily fluid matters. NICE suggests roughly 1000 to 1400 mL per day for 4 to 8 years, 1200 to 2100 mL for girls and 1400 to 2300 mL for boys aged 9 to 13, and 1400 to 2500 mL for girls and 2100 to 3200 mL for boys aged 14 to 18, varying with temperature, food and activity.^[2] Avoid caffeine-containing drinks.^[2] Some families find evening fluid restriction helpful (roughly 40% of daily fluids in the morning, 40% in the afternoon and 20% after 5 pm), but only if the family finds it helps; restriction should not starve the child of fluid overall.^{[1] [3]}
• Toileting: the child should void 4 to 7 times per day at regular intervals, the last time before sleep, and should have unrestricted toilet access at school.^[1][2]
• Diet: healthy diet; do not restrict diet as a treatment.^[2]
• Bed protection, deodoriser, emollient to protect skin from wetness; restart of nappies at night can decrease motivation to wake and void, so trial without them unless circumstances demand.^[1][2]
• Sleepovers and camp: plan ahead. If desmopressin will be used, a trial dose at home first secures the effective titrated dose.^[1]
• Reward systems reward agreed behaviours (drinking recommended fluids, voiding before sleep, taking medication, changing sheets), not dry nights, and never remove previously gained rewards or penalise.^[1][2]
• Waking and lifting do not produce long-term dryness and should be used only as a short-term practical measure, or self-instigated waking in an older child.^[2]
• Treat coexisting conditions first: constipation (in line with NICE constipation guidance), urinary tract infection (NICE under-16s guidance), diabetes, and obstructive sleep apnoea.^[1][2]
• Daytime symptoms before bedwetting when daytime symptoms predominate.^[2]

For children aged 5 to 7, motivational therapy (sticker chart with rewards for preset behaviour, escalating to rewards for dry nights) is a reasonable initial active step, allowing 3 months before moving to alarms or drugs if response is insufficient.^[1]

NICE recommends the alarm as first-line treatment for children and young people whose bedwetting has not responded to advice on fluids, toileting or a reward system, unless an alarm is undesirable to the child or family or is inappropriate (for example bedwetting very infrequent at fewer than 1 to 2 wet beds per week, or parents struggling to cope or expressing blame).^{[2] [1]}

Key points on using an alarm:

• Use every night, with the child wearing underwear (not an absorbent diaper) so moisture is detected. The child, not the parent, is responsible for the alarm, its cleaning and testing it before bed.^[1]
• When it sounds: child wakes, turns it off, finishes voiding in the toilet, returns, changes bedding and clothing with supervision, cleans or replaces the sensor, resets the alarm and goes back to sleep. The caregivers help at first.^[1]
• Keep a diary of wet and dry nights with positive reinforcement for proper use, getting up to void, and dry nights.^[1]
• Early response is assessed at 1 to 2 to 4 weeks depending on local guidance. Continue if there are smaller wet patches, the alarm goes off later or fewer times per night, fewer wet nights, or waking to the alarm. Stop only if there are no early signs.^[1][2]
• Continue until 14 consecutive dry nights (a response) or at least 2 weeks of uninterrupted dry nights (NICE), whichever framing the service uses; this usually takes 12 to 16 weeks.^[1][2]
• Do not stop at the first improvement: complete dryness may be a late sign and may take weeks.^[2]
• If there is no early response, add desmopressin or stop the alarm and retry in 6 to 12 months.^[1]
• Assess at 3 months: continue only if bedwetting is still improving and the child and family are motivated.^[2]
• An alarm is not excluded by daytime symptoms or secondary bedwetting.^[2]
• Evidence of efficacy: alarms are successful in approximately 66% of children, and relapse risk is lower with alarms than with desmopressin.^[1]
• Alarms are also appropriate for children under 7 depending on ability, maturity and motivation, and alternatives such as a vibrating alarm help children with hearing impairment.^[2]

Alarms and rewards together (positive reward for desired behaviour when the alarm sounds, going to the toilet, resetting it) improve outcomes.^[2]

Desmopressin acetate, a synthetic analogue of arginine vasopressin, is the medication of choice for MNE.^[1] It can be used alone or combined with an alarm for partial or non-response. ^[2]

Indications and age^[2]:

• Offer desmopressin over 7 years when rapid-onset or short-term improvement is the priority (for example sleepovers, camp, bullying, or distress), or when an alarm is inappropriate or undesirable.
• Consider desmopressin for children aged 5 to 7 years when treatment is needed and an alarm is inappropriate or undesirable. ^[2]
• Do not use desmopressin for children who have only daytime wetting without bedwetting.

Dosing (StatPearls)^[1]:

• Tablet: start 0.2 mg about 60 minutes before bed; titrate by 0.2 mg every 7 days to a maximum of 0.6 mg. ^[1]
• Orally disintegrating tablet (melt): start 120 micrograms; titrate by 120 micrograms every 7 days to a maximum of 360 micrograms. ^[1]
• The melt has higher bioavailability and is easier to give to younger children, though regulatory status differs by country and the melt is not approved for enuresis in the United States.

Fluid restriction is non-negotiable: limit water intake to about 200 mL (6.75 ounces) from 1 hour before bedtime and for 8 hours after the dose, following product information, to prevent dilutional hyponatraemia and seizures.^[1][2]

Administration and monitoring^[2]:

• Give at bedtime; if there has been partial or no response, consider giving it 1 to 2 hours before bedtime with fluid restriction starting 1 hour before the dose.
• Assess response at 4 weeks, continuing treatment for 3 months if there are signs of response (smaller wet patches, fewer episodes per night, fewer wet nights). Consider stopping if no response.
• If not completely dry after 1 to 2 weeks at the starting dose, increase the dose. ^[2]
• Full effect lasts roughly 8 hours; desmopressin does not help once its duration has passed.^[1]
• Many children relapse on withdrawal, so escalate gradually: withdraw desmopressin gradually (halve the effective dose for 2 weeks then stop) when recurrence has followed earlier courses, and use repeated courses as needed. A 1-week trial without medication every 3 months guides whether treatment is still necessary.^[1][2]
• Intranasal desmopressin (150 micrograms per spray, one spray for those under 50 kg, two for those over 50 kg) is still a published dosing form in some countries, but nasal desmopressin is no longer recommended in many places because of reports of severe hyponatraemia, seizures and death; check your local formulary and national guidance.^[1][3]
• Routine weight, serum electrolytes, blood pressure or urine osmolality are not recommended for every child on desmopressin.^[2]
• Desmopressin is acceptable in children with an overactive bladder too, and in children with sickle cell disease if an alarm is unsuitable and they can comply with overnight fluid restriction; withdraw it during sickle cell crisis.^[1][2]
• In emotional, behavioural or learning difficulty, desmopressin remains an option if an alarm is unsuitable and overnight fluid restriction is realistic.^[2]

Evidence statements that matter for counselling: desmopressin reduces bedwetting by about 1.3 nights per week on average, whereas alarms and desmopressin have comparable efficacy overall (alarms giving roughly 0.6 more dry nights), but alarms carry a lower relapse risk.^[1]

Anticholinergics such as oxybutynin are not effective alone for monosymptomatic bedwetting without daytime symptoms.^[2] They become useful when daytime overactive bladder is present: NICE recommends considering an anticholinergic combined with desmopressin for bedwetting in children who also have daytime symptoms, under a prescriber experienced in using the combination, and sometimes after failure of alarm and/or desmopressin.^[2] StatPearls cites oxybutynin 2.5 to 5 mg at bedtime with desmopressin for children with enuresis and daytime incontinence.^[1]

Common adverse effects of oxybutynin (dry mouth and eyes, constipation, flushing, sedation, central nervous system depression) can limit its use.^[1] NICE warns against combining an anticholinergic with imipramine for bedwetting.^[2]

Tricyclics must not be first-line treatment for bedwetting.^[2] They are reserved for children who have not responded to all other treatments and have been assessed by a clinician with expertise in refractory bedwetting, used with caution.^[2]

• Imipramine is the tricyclic to use, taken at bedtime, dose increased gradually, with clear warnings about overdose that can be fatal.^[2]
• StatPearls gives a starting dose of 10 to 25 mg 1 hour before bedtime, increased by 25 mg after 1 week, with a maximum of 50 mg for ages 6 to 12 and 75 mg for those 12 and older.^[1]
• Counsel that many children improve but more than two in three relapse after a 3-month course, that the initial course is 3 months, that it should be withdrawn gradually, and that further courses may be considered with a medical review every 3 months on repeated courses.^[1][2]
• Because of potential QT prolongation and cardiac toxicity, take a personal and family cardiac history (syncope, dizziness, palpitations, early cardiac disease under 40), perform a cardiovascular examination, blood pressure and an electrocardiogram before starting, with postpubertal girls having a urine pregnancy test; refer to paediatric cardiology if there is any cardiac history. Store the drug out of reach of children.^[1]
• Gradually taper and stop every 3 months for 2 weeks to guard against tolerance, and taper if there is no improvement within 3 months.^[1]

Combination therapy (alarm plus desmopressin, or desmopressin plus anticholinergic) is reserved for children who have not responded to single-modality treatment, and combination treatment with an alarm and desmopressin is appropriate when there is more than one recurrence after successful alarm treatment.^[1][2]

A less than 50% improvement after active intervention should trigger further investigation rather than simply repeating the same treatment.^[1] Consider constipation not fully treated, unrecognised overactive bladder, incorrect or inconsistent alarm use, recurrent UTI, diabetes, obstructive sleep apnoea, neurodevelopmental or behavioural issues, and expectant causes (obstruction, ectopic ureter). Investigations at that point may include renal and pelvic ultrasonography, abdominal radiography for constipation, sleep study and neurodevelopmental screening, with referral to developmental-behavioural paediatrics, paediatric urology, child psychiatry or psychology as appropriate.^[1]

Daytime wetting is not a milder version of bedwetting. It has its own mechanisms, and the usual approach is to treat the daytime problem first before tackling any night wetting.

Functional daytime incontinence in otherwise healthy children falls into recognisable patterns:

• Overactive bladder: small frequent voids, urgency, holding manoeuvres (squatting, crossing legs), daytime wetting, often with a normal renal tract. The bladder contracts before it is full.
• Dysfunctional voiding: the pelvic floor contracts during voiding, so the child strains to pass urine with a start-stop or staccato stream. This can lead to incomplete emptying, urinary tract infection and even daytime and night wetting.
• Underactive bladder / infrequent voiding: large volumes, long intervals, sometimes with high post-void residuals; the child simply does not go often enough.
• Holding behaviour: common at school when access to toilets is restricted; the child waits until the last minute.
• Constipation-related bladder dysfunction: the commonest structural cross-talk problem, and an often-overlooked one. A loaded rectum distorts the bladder base.
• Giggle incontinence and stress leakage in a subset of otherwise normal children.
• Vaginal pooling of urine in girls, leading to dampness after voiding.
• Anatomic and neurogenic causes: posterior urethral valves or meatal stenosis, ectopic ureter, spinal dysraphism, neurogenic bladder, and (in boys) meatal obstruction. ^[1]

This is what the non-monosymptomatic label captures: the wet night is only the tip.

NICE offers a structured approach even though management of daytime urinary symptoms is technically outside its scope of the bedwetting guideline.^[2]

1. Timed voiding: a clock-based schedule, starting with intervals the child can manage (for example every 2 hours) and lengthening, 4 to 7 voids per day, going before school and before bed, with unrestricted access to toilets at school and a note confirming it.^[1][2]
2. Double voiding for children with incomplete emptying.
3. Fluid management: adequate intake guided by the child's age from the NICE table above; water preferred, avoiding caffeine; no excessive evening intake where bedwetting coexists.
4. Constipation treated first and thoroughly, including behavioural approaches, osmotic laxatives and, if needed, disimpaction, with abdominal radiography where doubt remains. NICE recommends investigating and treating soiling or constipation in line with its constipation guidance.^[2]
5. Posture and relaxation: feet flat, elbows on knees, relaxed pelvic floor; avoid hovering over the toilet seat.
6. Pelvic floor rehabilitation, including biofeedback for dysfunctional voiding, where available.
7. Anticholinergic medication (oxybutynin 2.5 to 5 mg at bedtime, as above) for overactive bladder with daytime wetting, alone or combined with desmopressin for persistent night wetting.^[1]
8. Infection treated and recurrence investigated with imaging.

Where structural disease is suspected (posterior urethral valves, ectopic ureter, spinal dysraphism), or where there are recurrent infections, referral to paediatric urology with renal ultrasonography, voiding cystourethrography or lumbosacral magnetic resonance imaging is appropriate.

• Children under 5 years: reassure parents that many children of this age wet the bed at least once a week (about one in five at 4.5 years) and that night dryness often lags behind day dryness by months or years; toddlers cannot be expected to be dry at night.^[2] Ask whether toilet training has been attempted, and if not, why; offer a trial of at least 2 nights without nappies or pull-ups for children toilet-trained by day for longer than 6 months (longer where the child is older, improves, or family circumstances allow), and advise taking the child to the toilet at night.^[2]
• Under 5 with daytime struggles: if a child over 2 years has awareness of toileting needs and appropriate toileting behaviour but is struggling not to wet both day and night, consider further assessment and investigation for medical problems. Assess all under-5 bedwetters for constipation, because undiagnosed chronic constipation is a common cause of wetting and soiling in younger children.^[2]
• Sickle cell disease: do not exclude desmopressin if an alarm is unsuitable and the child can comply with night-time fluid restriction, and teach families to withdraw it during sickle cell crises.^[2]
• Attention deficit hyperactivity disorder and other neurodevelopmental conditions: enuresis is more common, and the wetting is a consequence or comorbidity rather than simply a behaviour; children with developmental or learning difficulties can still benefit from an alarm if it is tailored to their abilities.^[1][2]
• Mental health and family distress: about 20% to 30% (International Children's Continence Society) of children with enuresis have at least one mental health condition, and bedwetting itself produces shame and low self-esteem.^[1] Offer support and referral to psychological expertise where present.^[2]
• Constipation and soiling: treat first and persistently; it is one of the few reversible causes. Children with soiling may have unrecognised faecal impaction.
• Obstructive sleep apnoea: enuresis often improves after adenotonsillectomy.^[1]
• Immunocompromised and chronically ill children: more often have secondary enuresis from illness, polyuria or polydipsia; treat the predisposing condition.
• Adolescents: understand that 1% to 2% still wet into adulthood and that adult services and urology input may be needed; imipramine and combined approaches are more commonly considered.^[1]

• Children and young people with bedwetting that has not responded to courses of alarm and/or desmopressin, for further review and assessment of factors such as overactive bladder, underlying disease, and social and emotional factors.^[2]
• Suspected structural or neurological disease: posterior urethral valves, ectopic ureter, spinal dysraphism, neurogenic bladder.
• Recurrent urinary tract infections, renal or endocrine disease, diabetes, arginine vasopressin disorders, chronic kidney disease.
• Symptoms of obstructive sleep apnoea beyond initial advice.
• Children whose families express anger, blame or inability to cope, or where there is concern about maltreatment.^[2]
• Bedwetting in under-5 children with other worrying features, or where the history does not fit a developmental diagnosis.

• Urinalysis, a hand-drawn voiding diary and a plain abdominal radiograph for suspected constipation provide most of the diagnosis in settings without ultrasound or urodynamics.
• Behavioural advice, timed voiding, reward systems and constipation treatment cost very little and help many children; an enuresis alarm is the most effective non-drug treatment but may not be obtainable locally, in which case desmopressin is the main effective drug where available and where family commitment to night-time fluid restriction is realistic.
• Intranasal desmopressin has been withdrawn or restricted in many countries because of hyponatraemia, so use the oral form where it can be obtained and monitored.
• Check local formularies: desmopressin, oxybutynin and imipramine are not universally available, and swallowing difficulties may make melts preferable to tablets in younger children.
• Identify and treat chronic constipation aggressively: dietary fibre is often inadequate and pharmacological laxatives inexpensive.
• Same safety rules apply everywhere: store tricyclics out of reach of children, check the cardiac history before use, and avoid punishing the child.
• Adjuncts: adenotonsillectomy for obstructive sleep apnoea requires referral to a surgical service.

• Bedwetting is repeated involuntary wetting during sleep in a child over 5, monosymptomatic (no daytime symptoms) or non-monosymptomatic (daytime symptoms present), each primary or secondary according to whether 6 months of dryness was ever achieved.
• It is extremely common: about 15% at age 5, more boys than girls, about 1% to 2% into adulthood; bedwetting fewer than 2 nights per week has a prevalence of 21% at 4.5 years.
• The three mechanisms are nocturnal polyuria, small functional bladder capacity and failure of arousal, often combined; heritability is substantial.
• Secondary enuresis after 6 months dry accounts for roughly a quarter of cases and demands a search for a trigger: constipation, urinary tract infection, diabetes, sleep apnoea, seizures, kidney disease, polydipsia, pinworms and stress.
• Non-monosymptomatic (daytime wetting) bedwetting usually reflects a bladder or anatomic problem and, when it predominates, should be assessed and treated first.
• Constipation affects about one third to one half of children with bedwetting; treat it thoroughly.
• Assessment rests on history, examination, voiding diary and selective urinalysis; do not image a simple case.
• Red flags include recent onset, systemic illness, diabetes, urinary tract infection, obstruction, ectopic ureter, neurological or sacral signs, sleep apnoea and persistent secondary wetting (concern for maltreatment). ^[2]
• Alarm therapy is first-line after general advice for monosymptomatic bedwetting and cures about two thirds; use it until 14 consecutive dry nights.
• Desmopressin is the drug of choice, at 0.2 mg (tablet) or 120 micrograms (melt), titrating to 0.6 mg or 360 micrograms, 60 minutes before bed with strict 200 mL fluid restriction from 1 hour before to 8 hours after the dose.
• Nasal desmopressin is widely restricted because of hyponatraemia, seizures and death.
• Anticholinergics help overactive bladder with wet days but not monosymptomatic bedwetting; add to desmopressin when daytime symptoms exist.
• Tricyclics (imipramine) are last-resort, with cardiac safety monitoring, gradual dosing and secure storage, and high relapse on stopping.
• Children with under half improvement after active treatment need looking again, not repeating the same plan.

Urinary incontinence; Urinary tract infection in children; Constipation and encopresis; Diabetes mellitus (type 1 in children); Obstructive sleep apnoea; Attention deficit hyperactivity disorder. (posterior urethral valves, ectopic ureter, spinal dysraphism), or where there are recurrent infections, referral to paediatric urology with renal ultrasonography, voiding cystourethrography or lumbosacral magnetic resonance imaging is appropriate.>