Enuresis

Clinical picture

• Most children wet only at night, sleep through the event, and are extremely difficult to rouse, which reflects a high arousal threshold rather than laziness.
• Primary enuresis, meaning continence was never achieved for 6 months, accounts for roughly three quarters of cases and is strongly familial.
• Secondary enuresis follows a dry period and should prompt evaluation for urinary infection, diabetes, constipation, sleep apnea, and psychosocial stressors.
• Daytime wetting points instead toward overactive bladder, voiding postponement, or dysfunctional voiding, and needs a different treatment pathway.
• Around three quarters of children have an affected first-degree relative, and telling families this openly reduces blame more effectively than reassurance does.
• The main harm is social: missed sleepovers and camp, secrecy, low self-esteem, and punitive parental responses that make treatment adherence worse.

Criteria snapshot

• Urine is repeatedly voided into bed or clothes, and the behavior counts whether it is involuntary or, far less commonly, intentional.
• Frequency must reach at least twice weekly for 3 consecutive months, or else cause clinically significant distress or functional impairment.
• Chronological age must be at least 5 years, or the equivalent developmental level, which is why the diagnosis is not applied to younger children.
• The wetting is not attributable to a substance such as a diuretic or antipsychotic, or to a medical condition like diabetes or spina bifida.
• Specify the subtype as nocturnal only, diurnal only, or nocturnal and diurnal, since each implies a different mechanism and treatment plan.

Neurobiology

• Three mechanisms combine: nocturnal polyuria from a blunted overnight vasopressin rise, reduced functional bladder capacity, and failure to wake to a full bladder.
• Heritability is around 70%, with autosomal dominant transmission described in large pedigrees and linkage to loci on chromosomes 12q and 13q.
• Obstructive sleep apnea with adenotonsillar hypertrophy is an underrecognized driver, and adenotonsillectomy resolves wetting in a meaningful subset.
• Constipation with rectal distension mechanically compresses the bladder and reduces functional capacity, so it must be treated before anything else.
• ADHD is two to three times more common in children with enuresis and predicts poorer adherence to alarm therapy and higher relapse rates.
• Medical causes to exclude include urinary tract infection, diabetes mellitus and insipidus, hypercalciuria, neurogenic bladder, and posterior urethral valves.

Psychology

• In most children this is a maturational and physiological condition, and framing it as a psychological problem increases shame without improving dryness.
• Guilt, social withdrawal, and low self-esteem are consequences of the wetting rather than its cause, and they resolve as continence improves.
• Secondary enuresis correlates with identifiable stressors including parental separation, a new sibling, hospitalization, bullying, and maltreatment.
• Punishment and shaming reliably worsen outcomes, reduce disclosure, and predict dropout from alarm treatment, so removing them is an early intervention.
• Alarm therapy works through classical and operant conditioning, pairing bladder fullness with waking until inhibition or arousal becomes automatic.

Differential & comorbidity

• Screen every child with urinalysis and culture for infection and glycosuria, and take a constipation history, since these change management immediately.
• Neurogenic bladder is suggested by sacral dimples, hair tufts, abnormal gait, or lower limb reflex changes, and warrants imaging of the spine.
• Constant dampness in a girl who is otherwise dry raises suspicion of an ectopic ureter, which requires urological imaging rather than behavioral treatment.
• Comorbid ADHD, oppositional defiant disorder, anxiety, and developmental delay are common and each reduces the odds of completing alarm therapy.
• Deliberate wetting is rare and, when present, should prompt assessment for maltreatment, severe oppositionality, or significant psychiatric illness.

Pharmacologic treatment

• Desmopressin 0.2-0.6 mg orally at bedtime works quickly for nocturnal polyuria, but relapse on discontinuation is high and it is not curative.
• Restrict fluids from 1 hour before to 8 hours after each desmopressin dose, since hyponatremia with seizures is the serious adverse effect.
• Intranasal desmopressin is contraindicated for enuresis in the United States because of reported hyponatremic seizures at that route and dose.
• Imipramine 25-75 mg at bedtime achieves roughly 40% response but is third-line, requires ECG screening, and is lethal in overdose.
• Anticholinergics such as oxybutynin or solifenacin target detrusor overactivity in daytime wetting; monitor constipation and heat intolerance.

Psychotherapy

• The bedwetting alarm is first-line with the highest durable cure rate, around two thirds, but requires 8-16 weeks and a committed family.
• Urotherapy establishes timed voiding every 2-3 hours, proper toilet posture with foot support, double voiding, and daytime fluid loading.
• Reward systems should reinforce behaviors the child controls, such as following the routine and helping with bedding, never dry nights themselves.
• Dry-bed training and overlearning, in which fluids are increased once dryness is achieved, reduce relapse after successful alarm treatment.
• Parent education that removes punishment and explains the physiology is the single most reliable step toward completing any treatment course.

Adjunct options

• Start with a 48 to 72 hour bladder and bowel diary recording voided volumes, wet nights, stool pattern, and fluid timing across the day.
• Treat constipation aggressively with polyethylene glycol and confirm resolution, because this alone resolves wetting in a substantial minority.
• Screen for snoring, mouth breathing, and witnessed apneas, and refer for sleep evaluation when obstructive sleep apnea is suspected.
• Practical supports include waterproof bedding, a bedside light, and absorbent pants as a bridge for camps and sleepovers without abandoning treatment.
• Set expectations against the natural history of roughly 15% spontaneous remission per year, so families can judge whether treatment is adding value.

Clinical pearls

• Treat the constipation and the snoring first; a share of bedwetting resolves without anything else.
• The alarm cures, desmopressin controls. Choose by what the family can actually sustain.
• Reward the routine, never the dry night. Children cannot control the outcome you are paying for.