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Nocturnal Enuresis – Causes, Symptoms and Treatment

Nocturnal enuresis is the involuntary release of urine during sleep in children aged 5 and older. It is a common developmental condition that responds well to treatment.

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Things worth knowing about "Nocturnal Enuresis"

Nocturnal enuresis is the involuntary release of urine during sleep in children aged 5 and older. It is a common developmental condition that responds well to treatment.

What is Nocturnal Enuresis?

Nocturnal enuresis, commonly known as bedwetting, refers to the involuntary passage of urine during sleep in children who are at least 5 years of age. Before this age, nighttime wetting is considered developmentally normal. It is one of the most common developmental conditions in childhood, affecting approximately 10–15% of five-year-olds and around 1–2% of teenagers. Boys are more frequently affected than girls.

A distinction is made between primary nocturnal enuresis (the child has never been consistently dry at night) and secondary nocturnal enuresis (the child was dry for at least 6 months before the wetting resumed).

Causes

The causes of nocturnal enuresis are often multifactorial. Key contributing factors include:

Genetic predisposition: Bedwetting often runs in families. If one parent was affected, the risk increases to approximately 40%; if both parents were affected, the risk rises to around 70%.
Reduced nocturnal ADH secretion: The antidiuretic hormone (ADH) normally reduces urine production at night. In some children, this secretion is insufficient.
Small functional bladder capacity: A functionally small bladder may prevent the child from sensing the urge to urinate during sleep.
Deep sleep: Some children do not wake in response to signals of a full bladder.
Psychosocial factors: Stress, family conflicts, or significant life events can trigger secondary enuresis in particular.
Organic causes: Urinary tract infections, diabetes mellitus, diabetes insipidus, or anatomical abnormalities of the urinary tract should be ruled out.

Symptoms

The primary symptom is involuntary urination during sleep, occurring at least twice per month. Associated symptoms may include:

Frequent daytime urge to urinate (in cases of combined enuresis)
Psychological distress such as shame, social withdrawal, or reduced self-esteem
Sleep disturbances in some cases

Diagnosis

Diagnosis is based on a thorough medical history and physical examination. Typical diagnostic steps include:

Voiding diary: Parents and child record fluid intake, urination times, and wetting episodes over several days.
Urinalysis: To rule out urinary tract infections or the presence of glucose in the urine (indicating possible diabetes).
Ultrasound of the urinary tract: Assessment of the bladder and kidneys.
Uroflowmetry: Measurement of urine flow rate when a bladder dysfunction is suspected.

Organic causes must be excluded before initiating treatment.

Treatment

Treatment depends on the underlying cause, the degree of distress, and the age of the child. General measures are recommended as a first step:

General Measures

Adequate fluid intake throughout the day (do not restrict evening fluids without medical guidance)
Regular urination before bedtime
Keeping a voiding diary
Positive reinforcement and emotional support for the child (no blame or punishment)

Alarm Therapy (Bedwetting Alarm)

Enuresis alarm therapy is considered the most effective long-term treatment. A moisture sensor triggers an alarm at the first sign of wetting, waking the child and conditioning them to wake up in response to bladder fullness.

Pharmacological Treatment

Desmopressin: A synthetic analogue of ADH that reduces nocturnal urine production. Suitable for children aged 5 and older, particularly when reduced ADH secretion is the cause.
Anticholinergics (e.g., oxybutynin): Used for small, overactive bladders or combined enuresis.
Imipramine: A tricyclic antidepressant, now rarely used due to its side effect profile.

Psychological Support

In cases of secondary enuresis or where psychosocial triggers are identified, psychological counseling or family therapy may be beneficial.

Prognosis

The overall prognosis is favorable. Approximately 15% of affected children achieve spontaneous nighttime dryness each year. With targeted therapy, success rates can be significantly improved. If bedwetting persists into adulthood, organic or psychiatric causes should be thoroughly investigated.

References

German Society for Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy (DGKJP) – Clinical Guideline on Enuresis and Non-Organic (Functional) Urinary Incontinence in Children and Adolescents (2015/2020).
Neveus T. et al. – 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. Journal of Urology, 2006.
Vande Walle J. et al. – Practical consensus guidelines for the management of enuresis. European Journal of Pediatrics, 2012.

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