Diurnal Enuresis

Abstract

Diurnal enuresis is involuntary daytime wetting in a child old enough to have achieved reliable bladder control, conventionally five years; the International Children's Continence Society now prefers the term daytime incontinence for this waking sign, reserving enuresis for wetting during sleep. It is rarely a disease in itself but the output of a dysregulated lower urinary tract, most often an overactive bladder with urgency, a habit of postponing voiding, or a learned pattern of straining against a tense pelvic floor. It is a cognitive-behavioural as well as a urological condition, bound up with attention and impulse control and strongly comorbid with constipation and attention-deficit/hyperactivity disorder. This article sets out its ICCS framework, subtypes and mechanisms, comorbidities, epidemiology, and the behavioural treatment urotherapy, and provides interactive demonstrations.

Keywords: diurnal enuresis, daytime incontinence, overactive bladder, urotherapy

What Diurnal Enuresis Is

Diurnal enuresis is wetting that happens while a child is awake, in a child who is past the age at which daytime dryness is normally established. The qualifier matters: continence is a developmental achievement, and a toddler who is not yet dry is not incontinent in the clinical sense. By convention the line is drawn at five years of age, the point by which the great majority of children have reliable daytime control, so that wetting after that age is counted as a sign rather than a stage (Austin et al., 2016). The sign is the daytime member of a pair: enuresis in the broad sense covers involuntary urination that the child cannot yet control, and diurnal enuresis is the waking form, set against the nocturnal form that occurs during sleep.

The modern vocabulary has sharpened this. The International Children's Continence Society, the body that standardises the terminology of childhood bladder problems, reserves the word enuresis for wetting during sleep and prefers daytime incontinence for the waking sign, precisely because the two have different mechanisms and different treatments (Austin et al., 2016; Nevéus et al., 2006). The older label diurnal enuresis, still the Medical Subject Headings term and still in wide clinical use, names the same phenomenon. Whatever it is called, the daytime sign is read the way a clinician reads any functional sign: not as a disease to be named and closed, but as evidence about how the child's lower urinary tract and its control are working.

The domain spans bladder physiology, toilet behaviour, and the developing control systems that link the two. Table 1 sets out the principal functional subtypes of daytime wetting, the bladder mechanism behind each, and the behavioural signature by which it is recognised; the mechanistic sections that follow take them up in turn.

The ICCS Framework

The clinical understanding of daytime wetting rests on a shared vocabulary, and that vocabulary is the work of the International Children's Continence Society. Its standardisation documents fixed the definitions that every later study and guideline uses: what counts as incontinence, how to separate the daytime from the night-time sign, and how to subclassify the daytime forms by their lower-urinary-tract symptoms (Nevéus et al., 2006). The 2006 report first set these terms; the 2016 update refined them into the framework in current use, distinguishing storage symptoms such as urgency and frequency from voiding symptoms such as straining and hesitancy, and grouping the resulting conditions (Austin et al., 2016).

Two distinctions from that framework do most of the work. The first is between enuresis, now reserved for wetting during sleep, and daytime incontinence, the waking sign this article concerns; keeping them apart matters because a child may have one, the other, or both, and the management differs (Nevéus et al., 2020). The second is between the functional conditions, which make up the overwhelming majority and arise from how the bladder and pelvic floor are being used, and the far rarer organic or neurogenic causes, which a structured assessment is designed to exclude. The practical guidelines that followed the standardisation translate these distinctions into a clinical order: assess and treat any daytime symptoms first, because they shape the whole picture (Vande Walle et al., 2012).

Subtypes and Their Mechanisms

Most daytime wetting falls into one of three functional patterns, each with a distinct bladder mechanism. The commonest is urge incontinence, driven by an overactive bladder. The detrusor, the muscle of the bladder wall, contracts before the bladder is full and before the child wills it, producing sudden, hard-to-defer urgency; the child responds with holding manoeuvres, squatting on a heel, crossing the legs, the sudden curtsy, that are the outward sign of a fight against an uninhibited contraction (Franco, 2007; Franco, 2016). Wetting follows when the manoeuvre fails. Overactive bladder is the paediatric counterpart of the adult syndrome and is the single most common mechanism behind daytime incontinence.

The second pattern is voiding postponement: the child habitually puts off going to the toilet, often absorbed in play, and defers until the bladder can no longer be held. Here the problem is behavioural in origin, a matter of toilet habit and attention rather than an unstable detrusor, though a chronically over-filled bladder can become large and poorly sensate over time. Voiding postponement is the subtype most tightly linked to inattention and to behavioural comorbidity. The third pattern, dysfunctional voiding, is a learned incoordination: the child contracts the pelvic floor and external sphincter during voiding instead of relaxing them, producing a staccato or interrupted stream, incomplete emptying, and a raised risk of urinary tract infection. The large video-urodynamic series that mapped these patterns showed how often non-neurogenic bladder-sphincter dysfunction underlies persistent daytime symptoms, and how distinct the functional types are on objective study (Hoebeke et al., 2001; Chase et al., 2010).

The Cognitive and Behavioural Dimension

What makes daytime wetting a topic for cognitive psychology, and not only for paediatric urology, is that continence is a controlled behaviour. Staying dry requires sensing a filling bladder, inhibiting the urge to void until a socially appropriate time and place, and then voiding completely, a chain that depends on attention, inhibitory control, and the formation of a reliable habit. When any link is weak, daytime wetting follows, which is why the condition is so consistently bound up with the disorders of attention and impulse control.

The association with attention-deficit/hyperactivity disorder is the clearest case. Children with daytime incontinence have markedly elevated rates of ADHD, and the overlap is strongest for the voiding-postponement subtype, where the failure is one of noticing the urge and acting on it in time rather than of the bladder itself (von Gontard & Equit, 2015). The link runs in both directions: wetting is a stressor that worsens behaviour and self-esteem, and inattention makes the toilet routine harder to maintain, so the two sustain each other (von Gontard et al., 2011). The broader point is that daytime incontinence carries a real burden of psychological and psychiatric comorbidity that is not merely a reaction to the wetting but part of a shared substrate of self-regulation, which is why assessment attends to behaviour and attention alongside the bladder.

Comorbidity: The Bladder and the Bowel

The single most important comorbidity is constipation. A loaded rectum presses on the bladder, reduces its functional capacity, and provokes detrusor overactivity, so that a child's daytime wetting frequently will not resolve until the bowel is treated. The combination is common enough to have its own name, bladder-bowel dysfunction, and current reviews stress that it is both common and underdiagnosed, because the bowel problem is easily missed when the presenting complaint is wetting (dos Santos et al., 2017). Treating the constipation is often the single most effective step, and failing to look for it is the commonest reason a straightforward case does not improve.

Recurrent urinary tract infection is the other medical comorbidity that both signals and aggravates daytime dysfunction, particularly in the dysfunctional-voiding subtype where incomplete emptying leaves residual urine. The clustering of wetting, constipation, infection, and behavioural difficulty is what the bladder-bowel-dysfunction concept captures: these are not independent problems that happen to co-occur but a connected pattern of lower-pelvic and self-regulatory dysfunction, and effective management addresses the cluster rather than the wetting alone.

Epidemiology

Daytime wetting is common in early school age and becomes less so each year as continence matures. Large population studies put daytime incontinence in the region of several per cent of school-age children, less prevalent than night-time wetting but far from rare, and more common in girls than in boys, the reverse of the sex ratio for nocturnal enuresis (Sureshkumar et al., 2009). A single population survey of several thousand school-age children found daytime wetting in a minority but clinically significant fraction, with clear associations to urgency, frequency, and constipation, and to behavioural and emotional difficulty (Sureshkumar et al., 2009).

International prevalence syntheses place these figures in context. The Fourth International Consultation on Incontinence reviewed urinary incontinence across the lifespan and confirmed that childhood daytime incontinence is a substantial contributor to the overall burden, with prevalence falling steadily through childhood as the control system matures (Buckley & Lapitan, 2010). The epidemiological signal is consistent: daytime wetting is a developmental condition whose prevalence declines with age, which is why spontaneous resolution is common and why the decision to treat weighs the distress and the comorbidity, not the wetting alone.

Assessment and Urotherapy

Assessment is built to separate the common functional causes from the rare organic ones and to identify the subtype, because the subtype dictates the treatment. The core tools are simple and behavioural: a history of the wetting and of bowel habit, a voiding diary recording the timing and volume of voids and of wet episodes, a check for constipation, a urinalysis to exclude infection, and an uroflow with a postvoid-residual measurement where dysfunctional voiding is suspected. The diary is central because it reveals the pattern, whether the child voids too often at small volumes, too rarely at large ones, or with an interrupted stream, which is exactly the information that names the subtype.

First-line treatment is urotherapy, a non-surgical, non-pharmacological programme that is explicitly behavioural. The International Children's Continence Society standardisation document defines urotherapy as education about normal bladder function, a regimen of regular timed voiding, sound fluid intake and toilet posture, treatment of any constipation, and the use of a diary to track progress (Nieuwhof-Leppink et al., 2021). For dysfunctional voiding, this is extended with biofeedback that teaches the child to relax the pelvic floor during voiding (Chase et al., 2010). Pharmacotherapy, principally anticholinergics for a genuinely overactive bladder, is reserved for cases that do not respond to urotherapy, and it is added to the behavioural programme rather than replacing it. The treatment, in other words, is largely a matter of retraining a behaviour, which is what places daytime incontinence as much in the cognitive-behavioural domain as in the urological one.

Figure

Figure 1

Urge Incontinence Versus Voiding Postponement

Interactive Demonstrations

The three demonstrations below make the core ideas manipulable. The first is a voiding-diary simulator: adjust drinking, bladder stability, and how long the child postpones, and watch the bladder-volume trace cross its leak threshold. The second is a subtype classifier that takes a symptom profile, urgency, postponement, and straining, and names the functional subtype and its first-line treatment. The third computes expected bladder capacity from age and compares a measured voided volume against the small- and large-capacity thresholds that the worked example uses.

Worked Example

Consider how a clinician decides whether a child's bladder is small for her age, the measurement that distinguishes an overactive from a postponed bladder. The International Children's Continence Society uses a simple formula for expected bladder capacity in children: capacity in millilitres equals thirty times the quantity age-in-years plus one. For a seven-year-old this gives thirty times eight, which is two hundred and forty millilitres of expected capacity.

The framework then reads the child's maximum voided volume, the largest single void recorded on her diary, against that expectation. A maximum voided volume below sixty-five per cent of expected capacity marks a small-capacity bladder, the signature of detrusor overactivity; a volume above one hundred and fifty per cent marks a large-capacity bladder, the signature of voiding postponement. For our seven-year-old, sixty-five per cent of two hundred and forty is one hundred and fifty-six millilitres, and one hundred and fifty per cent is three hundred and sixty millilitres. Suppose her diary shows a maximum voided volume of one hundred and forty millilitres. That is fifty-eight per cent of her expected capacity, below the one-hundred-and-fifty-six-millilitre threshold, so her bladder is small for her age.

The worked lesson is that the diary converts a vague complaint into a classification. A maximum voided volume of one hundred and forty millilitres means little on its own, but set against an age-expected two hundred and forty it places the child firmly in the overactive-bladder, urge-incontinence group, and points first-line treatment toward urgency control within urotherapy rather than toward the timed-voiding emphasis that a large-capacity, postponing bladder would need (Austin et al., 2016; Nieuwhof-Leppink et al., 2021).

Discussion

Diurnal enuresis sits at the join of two disciplines. It is a urological sign, the output of a lower urinary tract that is overactive, over-deferred, or incoordinated, and it is a behavioural one, the product of a control routine that depends on attention, inhibition, and habit. The history of the field is the story of taking it seriously as both: the International Children's Continence Society built a shared vocabulary that separated the daytime from the night-time sign and sorted the daytime forms by mechanism, and that vocabulary turned a vague complaint into a set of recognisable, treatable subtypes.

The unifying theme is that daytime wetting is usually a functional problem of use rather than a structural problem of the organ, which is why its first-line treatment is behavioural retraining and not medication or surgery. The comorbidities make the same point from the other side: constipation shares the pelvic floor, and attention-deficit/hyperactivity disorder shares the self-regulatory substrate, so the wetting cannot be understood or treated in isolation from the bowel and the behaviour around it. The open problems are those of selection and adherence, which children need pharmacological or neuromodulatory help beyond urotherapy, and how to sustain a demanding daily routine in the children, many of them inattentive, who find routines hardest to keep.

Current Directions

The most active front is the standardisation and strengthening of urotherapy itself. The International Children's Continence Society's 2021 document set out, for the first time in a single standard, the definitions, indications, and practice of urotherapy, separating standard urotherapy from the specific interventions such as biofeedback and distinguishing the evidence for each (Nieuwhof-Leppink et al., 2021). The direction of travel is toward a behavioural treatment specified precisely enough to be delivered consistently and tested rigorously, rather than a loose bundle of good advice.

A second direction is the integration of the daytime and night-time pictures. The current management standard for nocturnal enuresis makes the point explicitly: daytime symptoms must be identified and treated before night-time wetting is addressed, because an overactive or dysfunctional bladder by day undermines any night-time treatment (Nevéus et al., 2020). A third is the deepening account of the overactive bladder in children, where contemporary reviews are mapping the detrusor and central-control mechanisms behind paediatric urgency onto the broader neuroscience of bladder control, which may in time give the urge-incontinence subtype a more mechanistic and less purely descriptive treatment (Franco, 2016).

Common Misconceptions

Daytime wetting is the same thing as bedwetting.

They are distinct signs with different mechanisms and treatments; the International Children's Continence Society reserves enuresis for sleep wetting and calls the waking sign daytime incontinence, and a child may have either or both (Austin et al., 2016; Nevéus et al., 2020).

A child who wets by day is being lazy or seeking attention.

Daytime wetting is a functional problem of the lower urinary tract, an overactive bladder, voiding postponement, or dysfunctional voiding, not a wilful act, and it is strongly linked to attention and impulse-control difficulty rather than to defiance (Franco, 2016; von Gontard & Equit, 2015).

It has nothing to do with the bowel.

Constipation is the single most important comorbidity: a loaded rectum reduces bladder capacity and provokes overactivity, and daytime wetting often will not resolve until the constipation is treated, the pattern named bladder-bowel dysfunction (dos Santos et al., 2017).

The first treatment is medication.

First-line treatment is urotherapy, a behavioural programme of education, timed voiding, fluid and posture management, and constipation control; medication is reserved for cases that do not respond and is added to the behavioural programme, not substituted for it (Nieuwhof-Leppink et al., 2021; Chase et al., 2010).

Glossary

Key Researchers

Paul F. Austin

(Baylor College of Medicine; Texas Children's Hospital). Lead author of the 2016 International Children's Continence Society standardization update that defines the modern terminology of daytime lower-urinary-tract dysfunction in children. Faculty

Stuart B. Bauer

(Boston Children's Hospital; Harvard Medical School). Founding figure in paediatric urodynamics and long-standing member of the ICCS Standardization Committee, whose work defined the functional bladder patterns underlying childhood daytime wetting. Faculty

Israel Franco

(Yale School of Medicine). Authority on paediatric overactive bladder, whose pathophysiology work explains the detrusor-overactivity and central-control mechanisms behind urge-type daytime wetting. Faculty

Alexander von Gontard

(formerly Saarland University). Child psychiatrist whose work established the psychiatric comorbidity of incontinence, the ADHD and behavioural associations that make daytime wetting a cognitive-behavioural as well as a urological condition. ORCID · Wikidata

Tryggve Nevéus

(Uppsala University). Paediatric nephrologist and former President of the International Children's Continence Society (2014–22); co-author of the ICCS standardization and management documents that frame diurnal enuresis. ORCID · Faculty

Frequently Asked Questions

What is diurnal enuresis?

It is involuntary wetting during waking hours in a child who is past the age of expected daytime bladder control, conventionally five years. The International Children's Continence Society prefers the term daytime incontinence for the same sign.

How is it different from bedwetting?

Bedwetting, or nocturnal enuresis, happens during sleep; diurnal enuresis happens while the child is awake. They have different mechanisms and different treatments, and a child may have one, the other, or both.

What causes daytime wetting?

Most cases are functional problems of the lower urinary tract: an overactive bladder with urgency, a habit of postponing voiding, or a learned incoordination called dysfunctional voiding. Structural or neurological causes are rare and are what assessment is designed to exclude.

Why is constipation so important?

A full rectum presses on the bladder, reduces its capacity, and provokes overactivity, so daytime wetting often will not resolve until the constipation is treated. The combined pattern is called bladder-bowel dysfunction.

Is daytime wetting linked to ADHD?

Yes. Children with daytime incontinence have markedly elevated rates of attention-deficit/hyperactivity disorder, most strongly for the voiding-postponement subtype, because staying dry depends on noticing the urge and acting on it in time.

What is urotherapy?

It is the first-line behavioural treatment: education about normal bladder function, a regimen of regular timed voiding, sound fluid intake and toilet posture, treatment of constipation, and a diary to track progress. For dysfunctional voiding it is extended with pelvic-floor biofeedback.

When is medication used?

Medication, principally anticholinergics for a genuinely overactive bladder, is reserved for children who do not respond to urotherapy, and it is added to the behavioural programme rather than replacing it.

Will a child grow out of it?

Daytime wetting becomes less common each year as bladder control matures, so spontaneous resolution is common. The decision to treat weighs the distress and the comorbidities, such as infection and constipation, rather than the wetting alone.

References

Austin, P. F., Bauer, S. B., Bower, W., Chase, J., Franco, I., Hoebeke, P., ... Nevéus, T. (2016). The standardization of terminology of lower urinary tract function in children and adolescents: Update report from the Standardization Committee of the International Children's Continence Society. Neurourology and Urodynamics, 35(4), 471–481. https://doi.org/10.1002/nau.22751

Buckley, B. S., & Lapitan, M. C. M. (2010). Prevalence of urinary incontinence in men, women, and children—Current evidence: Findings of the Fourth International Consultation on Incontinence. Urology, 76(2), 265–270. https://doi.org/10.1016/j.urology.2009.11.078

Chase, J., Austin, P., Hoebeke, P., & McKenna, P. (2010). The management of dysfunctional voiding in children: A report from the Standardisation Committee of the International Children's Continence Society. The Journal of Urology, 183(4), 1296–1302. https://doi.org/10.1016/j.juro.2009.12.059

dos Santos, J., Lopes, R. I., & Koyle, M. A. (2017). Bladder and bowel dysfunction in children: An update on the diagnosis and treatment of a common, but underdiagnosed pediatric problem. Canadian Urological Association Journal, 11(1-2 Suppl 1), S64–S72. https://doi.org/10.5489/cuaj.4411

Franco, I. (2007). Overactive bladder in children. Part 1: Pathophysiology. The Journal of Urology, 178(3), 761–768. https://doi.org/10.1016/j.juro.2007.05.014

Franco, I. (2016). Overactive bladder in children. Nature Reviews Urology, 13(9), 520–532. https://doi.org/10.1038/nrurol.2016.152

Hoebeke, P., Van Laecke, E., Van Camp, C., Raes, A., & Van De Walle, J. (2001). One thousand video-urodynamic studies in children with non-neurogenic bladder sphincter dysfunction. BJU International, 87(6), 575–580. https://doi.org/10.1046/j.1464-410X.2001.00083.x

Nevéus, T., von Gontard, A., Hoebeke, P., Hjälmås, K., Bauer, S., Bower, W., ... Djurhuus, J. C. (2006). The standardization of terminology of lower urinary tract function in children and adolescents: Report from the Standardisation Committee of the International Children's Continence Society. The Journal of Urology, 176(1), 314–324. https://doi.org/10.1016/S0022-5347(06)00305-3

Nevéus, T., Fonseca, E., Franco, I., Kawauchi, A., Kovacevic, L., Nieuwhof-Leppink, A., ... Rittig, S. (2020). Management and treatment of nocturnal enuresis—an updated standardization document from the International Children's Continence Society. Journal of Pediatric Urology, 16(1), 10–19. https://doi.org/10.1016/j.jpurol.2019.12.020

Nieuwhof-Leppink, A. J., Hussong, J., Chase, J., Larsson, J., Renson, C., Hoebeke, P., ... von Gontard, A. (2021). Definitions, indications and practice of urotherapy in children and adolescents: A standardization document of the International Children's Continence Society (ICCS). Journal of Pediatric Urology, 17(2), 172–181. https://doi.org/10.1016/j.jpurol.2020.11.006

Sureshkumar, P., Jones, M., Cumming, R., & Craig, J. (2009). A population based study of 2,856 school-age children with urinary incontinence. The Journal of Urology, 181(2), 808–816. https://doi.org/10.1016/j.juro.2008.10.044

Vande Walle, J., Rittig, S., Bauer, S., Eggert, P., Marschall-Kehrel, D., & Tekgül, S. (2012). Practical consensus guidelines for the management of enuresis. European Journal of Pediatrics, 171(6), 971–983. https://doi.org/10.1007/s00431-012-1687-7

von Gontard, A., Baeyens, D., Van Hoecke, E., Warzak, W. J., & Bachmann, C. (2011). Psychological and psychiatric issues in urinary and fecal incontinence. The Journal of Urology, 185(4), 1432–1436. https://doi.org/10.1016/j.juro.2010.11.051

von Gontard, A., & Equit, M. (2015). Comorbidity of ADHD and incontinence in children. European Child & Adolescent Psychiatry, 24(2), 127–140. https://doi.org/10.1007/s00787-014-0577-0