Bed-Wetting - Cause

SYMPTOMS & TREATMENTS

Almost all children who wet the bed do not do so intentionally. Most likely, several factors are involved when a child older than age 5 continues to wet the bed. Possible causes of primary nocturnal enuresis include:

  • Delayed development. Children with a less mature nervous system may not be as able to sense when the bladder is full.
  • Small bladder capacity. Having a smaller-than-normal bladder may make some children more prone to wet the bed.
  • Too little antidiuretic hormone (ADH). Levels of antidiuretic hormone (ADH), a brain chemical that signals the kidneys to release less water, normally rise at night. Some children who wet their beds may not produce more ADH at night.
  • Sound sleeping. Many parents note that their child who wets the bed is a deep sleeper. These children usually wet the bed less often as their sleep patterns mature.
  • Psychological and social factors. Bed-wetting does not appear to be a direct result of emotional problems. In fact, bed-wetting may be the cause of some emotional disturbances for children. But children living in stressful home situations or in institutions may be more likely to wet the bed.

Some of these factors may be inherited. A child is at increased risk for wetting the bed if one or both parents has a history of bed-wetting as a child.

Most cases of primary nocturnal enuresis are not caused by any medical condition. But secondary nocturnal enuresis, which is bed-wetting that occurs after a period of staying dry, is more likely to be related to a medical condition. Examples of physical causes include a kidney or bladder infection (urinary tract infection) or birth defects that affect the urinary tract Click here to see an illustration.. Emotional stress, such as may result from the birth of a brother or sister, can also be a factor in triggering bed-wetting.

By: Healthwise StaffLast Revised: October 26, 2010
Medical Review: Susan C. Kim, MD - Pediatrics
Thomas Emmett Francoeur, MDCM, CSPQ, FRCPC - Pediatrics

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