Faecal Incontinence in Children

Faecal incontinence in children is involuntary passage of stool at an age when bowel control is developmentally expected (generally from age four years onward).

It most commonly reflects overflow soiling secondary to chronic functional constipation with faecal retention, which accounts for the substantial majority of cases. A smaller proportion are non-retentive faecal incontinence, without constipation and more often associated with behavioural or psychological factors. Less commonly there is an organic cause.

The clinical priority is to identify constipation as the driving mechanism in the great majority of presentations. Management differs substantially, and often counterintuitively to families, from the mistaken assumption that soiling is simple behavioural non-compliance or regression.

Pathophysiology and classification

• Retentive faecal incontinence (overflow soiling) is the commonest presentation by a substantial margin. Chronic faecal retention causes progressive rectal distension. The distended rectum progressively loses normal sensory function, and the child increasingly cannot perceive rectal fullness.
• The anal sphincter mechanism is progressively stretched and functionally weakened. Softer, more liquid stool then leaks involuntarily around the retained, impacted faecal mass, frequently without the child's conscious awareness. Families need to understand this for a non-punitive approach.
• The underlying chronic constipation has a broad range of contributing factors and is frequently self-perpetuating. An initial, sometimes minor episode of painful defecation, from any cause, leads to voluntary stool withholding to avoid discomfort.
• Withholding produces progressive faecal retention and increasing stool size and hardness. Any subsequent attempt at defecation is more painful, which reinforces withholding and perpetuates the cycle.
• Non-retentive faecal incontinence occurs without constipation or faecal retention. Bowel movements are normal and regular, alongside episodes of inappropriate stool passage. It is more often associated with behavioural, developmental, or psychological factors, including in some cases inadequate or coercive toilet training or broader emotional or behavioural difficulty. It needs a different diagnostic and management approach from the far commoner retentive pattern.
• Organic causes are substantially less common. They include Hirschsprung disease, which typically also presents with delayed meconium passage in the neonatal period, and spinal cord abnormality (including spina bifida or a tethered cord) affecting neurological control of bowel function. Anorectal structural abnormality is rare.
• Consider and exclude organic causes in atypical presentations or when red flag features are present.

• Retentive faecal incontinence characteristically presents with soiling: small amounts of liquid or soft stool in the child's underwear, often without the child's apparent awareness.
• The child frequently denies or minimises soiling when questioned. This reflects genuine lack of awareness and sensation, not deliberate concealment or dishonesty, which families need to understand.
• The history includes infrequent, hard, or painful bowel movements and stool withholding behaviour. Characteristic postures are stiffening the legs, standing on tiptoes, or hiding when feeling the urge to defecate, reflecting active attempts to avoid or delay painful defecation.
• On examination a palpable abdominal faecal mass and the rectal examination findings support the retentive mechanism.
• Non-retentive faecal incontinence presents with otherwise normal, regular, non-painful bowel movements alongside stool passage in inappropriate places or circumstances. There is no history of painful defecation or withholding, and no examination findings of significant faecal loading.
• Psychosocial impact is significant and common: embarrassment, social withdrawal and, not infrequently, secondary behavioural or emotional difficulty. This sometimes reflects previous punitive or shaming responses from family members, teachers, or peers. It warrants sensitive, proactive attention in assessment and management.
• Red flags warranting investigation for an organic cause are delayed meconium passage in the neonatal period (raising suspicion of Hirschsprung disease), and any neurological symptom or sign, including lower limb weakness, altered gait, or a cutaneous finding over the lower spine suggesting occult spinal abnormality.
• Significant, longstanding constipation dating from infancy that is substantially refractory to standard management is also a red flag.

• Diagnosis is clinical, based on the history and examination. Careful assessment is essential to distinguish the far commoner retentive (overflow) pattern from the non-retentive pattern, because management differs substantially.
• Examine the abdomen for a palpable faecal mass. Where clinically appropriate, and with sensitive explanation to the child and family, a gentle digital rectal examination assesses for a significant rectal faecal mass. This confirms the retentive mechanism. The general assessment principles are those under constipation.
• Plain abdominal radiography is not routinely required, because clinical assessment alone is generally sufficient. It may occasionally confirm significant faecal loading where there is diagnostic uncertainty or the child cannot tolerate examination.
• When red flag features are present, pursue investigation of the suspected organic cause: rectal biopsy for suspected Hirschsprung disease, or spinal imaging for suspected occult spinal dysraphism. The diagnostic principles are those under the individual conditions.

• Psychoeducation for the child and family is the foundation of management. Explain the retentive mechanism explicitly.
• Parents commonly and understandably assume the soiling is deliberate, laziness, or regression. Explain instead that overflow soiling involves genuine lack of awareness and sensation.
• This shifts the family away from punitive or shaming responses, which are ineffective and actively counterproductive.
• Disimpaction with a high-dose osmotic laxative regimen (principles as under constipation) is the first step for retentive faecal incontinence. No maintenance approach can work while significant faecal retention and rectal distension persist.
• Explain to the family that loose stool output and soiling often increase alarmingly at first during disimpaction. This is expected and necessary, not treatment failure or worsening.
• After successful disimpaction, a sustained maintenance laxative regimen is essential, typically an osmotic laxative at a dose that ensures regular, soft, comfortable stool passage.
• Maintenance generally continues for a prolonged period, commonly many months and sometimes a year or longer, so that the distended rectum recovers normal tone, sensation, and function. Premature discontinuation is a common and readily preventable cause of relapse, so explain this in advance.
• Behavioural intervention is integral alongside pharmacological treatment. Establish a regular toileting routine, with the child sitting on the toilet for a brief, defined period after meals to use the physiological gastrocolic reflex.
• Use positive reinforcement that rewards sitting on the toilet as instructed, not successful stool passage, which is outside the child's conscious control during recovery.
• Non-retentive faecal incontinence needs a behavioural and psychologically oriented approach rather than laxatives: structured toileting programmes and, where significant emotional or behavioural difficulty coexists, psychological assessment and support.
• Provide ongoing psychosocial support for distress, low self-esteem, or social difficulty. Follow up in a sustained, structured way over the prolonged treatment course, because full recovery of rectal function takes time. Continue family education and support throughout.