Nocturnal enuresis

The organising idea of this topic is that bedwetting is a treatable condition driven by three reconcilable mechanisms, and the first decision is always whether daytime symptoms are present. The International Children's Continence Society frames the whole pathway around that idea: confirm the child is five or older, separate monosymptomatic from non-monosymptomatic disease, exclude the red flags with a focused history and urinalysis, and then offer first-line therapy with the alarm or desmopressin. ^{[1] [2]} Almost every child with monosymptomatic enuresis does well; the danger sits in the child with daytime symptoms or systemic features who is mislabelled as a simple bedwetter and denied the daytime or organic work-up that changes the plan.

This page covers the ICCS definition, the monosymptomatic and primary-versus-secondary classification, the three-systems pathophysiology, the clinical assessment built on the voiding diary and urinalysis, first-line alarm and desmopressin therapy with exact doses and the fluid-restriction safety rule, combination therapy and the second-line agents, and the red flags that demand investigation. It links to the leaves on daytime urinary incontinence, constipation, polyuria and polydipsia, and obstructive sleep apnoea, because enuresis often coexists with each of these and the first step is to recognise when it does. ^[3]

Overview & Definition

A school-age child who wets the bed almost every night is the picture most clinicians carry of nocturnal enuresis, and it is the right place to start. The International Children's Continence Society defines nocturnal enuresis as intermittent involuntary voiding during sleep in a child aged five years or older. ^[1] The word intermittent matters: the child is continent by day and the wetting is a sleep phenomenon, which separates enuresis from continuous incontinence and from the wetting of a neurogenic bladder. The age threshold of five reflects the developmental point by which most children are reliably dry at night, so wetting below that age is usually normal variation rather than disease. ^[2]

Enuresis is common, which is part of why the definition carries an age threshold rather than treating any wetting as abnormal. About 15 per cent of five-year-olds wet the bed, falling to around 7 per cent at ten years and 1 to 3 per cent at fifteen, and each year about 15 per cent of affected children become dry without treatment. ^[3] This favourable natural history shapes the counselling: most children resolve spontaneously, but the psychosocial cost of waiting can be high, which is why active treatment is offered to the child who is distressed rather than watchful waiting alone.

The practical first question after confirming the diagnosis is whether the wetting is monosymptomatic. Monosymptomatic nocturnal enuresis is bedwetting with no daytime lower urinary tract symptoms, and it is the form that flows directly into alarm or desmopressin therapy. Non-monosymptomatic nocturnal enuresis adds daytime urgency, frequency, daytime incontinence, holding postures or an abnormal stream, and it demands a different first step in which the daytime symptoms and any constipation are addressed before the night. ^[1] Getting this single distinction right at the first consultation is what keeps the rest of the pathway on track.

References12ShowHide

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