What is the pathophysiology of pediatric constipation?

Updated: Dec 14, 2018
  • Author: Stephen M Borowitz, MD; Chief Editor: Carmen Cuffari, MD  more...
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Most children suffering from constipation have no underlying medical condition. They are often labeled as having functional constipation or acquired megacolon. In most cases, childhood constipation develops when the child begins to associate pain with defecation. Once pain is associated with the passage of bowel movements, the child begins to withhold stools in an attempt to avoid discomfort. As stool withholding continues, the rectum gradually accommodates, and the normal urge to defecate gradually disappears. The infrequent passage of very large and hard stools reinforces the child's association of pain with defecation, resulting in worsening stool retention and progressively more abnormal defecation dynamics with anal sphincter spasm. Chronic rectal distention ultimately results in both loss of rectal sensitivity, and loss of the urge to defecate, which can lead to fecal incontinence (ie, encopresis).

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