Soiling is one of the most distressing and least talked-about problems in childhood. Parents are embarrassed. Children are deeply ashamed. Teachers may be exasperated. And the reaction most likely to make everything worse — anger and punishment — is often the first instinct, because the soiling looks deliberate.
It almost never is. In the vast majority of children, soiling is the result of chronic constipation and overflow incontinence: an overfilled rectum that has lost its normal sensitivity, with soft stool bypassing the blockage and leaking into the underwear. The child genuinely does not feel it coming. Understanding this changes the entire approach.
Healthbooq (healthbooq.com) covers digestive health in children through the early years.
Why Soiling Happens
The most common mechanism is retentive soiling (overflow incontinence). A child becomes constipated, perhaps after an illness, a change in diet, a period of stress, or simply an episode of painful defecation that triggered fear of the toilet. They begin to withhold stool — sometimes consciously, sometimes as a reflex response to anticipated pain.
With withholding, the rectum fills with hard, impacted stool. The rectal wall stretches to accommodate this increasing load. Over time, the muscle in the rectal wall becomes overstretched and fatigued, losing its normal tone. The child's ability to sense fullness is also reduced because the constant distension has blunted the sensory receptors. Soft, newer stool passing from above cannot get past the impaction and leaks around it, appearing in the underwear as loose or liquid soiling.
Non-retentive soiling (without constipation) is much less common and may relate to psychological factors, incomplete toilet training, or neurological issues.
How Common It Is
Encopresis (defined as soiling in a child over four) affects approximately 1 to 3 per cent of children. It is about four times more common in boys than girls. It has a significant emotional toll: most affected children describe shame, social withdrawal, and anxiety around school and social activities. Bullying related to soiling is common. Depression is more prevalent in children with chronic encopresis.
Diagnosis
A GP will typically take a history focusing on stool frequency and consistency, diet, fluid intake, and the pattern of soiling (timing, awareness, consistency). A NICE clinical knowledge summary and NICE guideline NG90 provide the framework for assessment and management.
On examination, the abdomen may show palpable faecal masses. Digital rectal examination is rarely necessary in primary care if the history clearly points to constipation.
Overflow incontinence is distinguished from diarrhoea by the history: the child is not having frequent, watery bowel motions, they are having infrequent hard stools (or sometimes no obvious stool at all) with liquid leakage between them.
Hirschsprung's disease (a congenital absence of ganglion cells in the rectum causing obstruction) is important to exclude in children with severe constipation from infancy. It is typically identified in the newborn period but occasionally presents later.
Treatment
Treatment has three phases, described in NICE NG90:
Disimpaction: clearing the backlog. This is done with escalating doses of macrogol (polyethylene glycol, brand name Movicol or Laxido in the UK), given over several days to weeks. The dose is titrated until the child passes stool of a loose, clear consistency — this indicates the impaction has cleared. Disimpaction is not optional: starting maintenance laxatives without disimpaction first is ineffective because the hard blockage remains.
Maintenance: after disimpaction, lower daily doses of macrogol are continued indefinitely to keep the stool soft and the bowel moving regularly. This phase lasts months to years. Many families stop laxatives too early (when the soiling reduces), before the rectum has had adequate time to regain normal tone and sensation.
Behavioural support: regular toilet sits at consistent times (typically after meals, using the gastrocolic reflex), a positive, non-shaming approach at home and school, reward charts for sits rather than outcomes, and school communication so toilet access is facilitated. Children should never have to ask permission to use the toilet.
Resolution requires patience. Most children improve over twelve to twenty-four months of consistent treatment. Some require referral to a paediatric gastroenterologist or specialist continence service.
The Role of Shame
Shame is the enemy of recovery. Children who are repeatedly scolded, punished, or humiliated for soiling develop heightened anxiety around toileting, are less likely to report accidents, hide soiled underwear, and have worse outcomes. The most powerful thing a parent can do — alongside medical treatment — is to communicate clearly and repeatedly that this is a medical problem, not their fault, and that the family will work on it together.
Key Takeaways
Encopresis is the passage of stool in inappropriate places in a child aged four or over who has been or should have been toilet trained. Around 90 per cent of cases are caused by overflow incontinence secondary to chronic constipation: the rectum becomes so distended with impacted stool that soft stool leaks around the blockage without the child being aware. It is not wilful or deliberate. Treatment involves disimpaction (clearing the backlog), followed by prolonged maintenance laxative therapy and behavioural support. Recovery takes months to years. Parental understanding that soiling is a medical symptom, not naughty behaviour, is crucial to avoiding shame that worsens outcomes.
