Which of the following is a common contributing factor to adult nocturnal enuresis?

• A. Detrusor overactivity
• B. Sleep disorders
• C. Nocturnal polyuria
• D. Dehydration at night

Answer: (A)

Detrusor overactivity causes the bladder muscle to contract involuntarily during filling. When these premature contractions happen at night, the bladder can’t hold urine for the whole sleep period, leading to leakage. This storage dysfunction directly contributes to adult nocturnal enuresis by reducing the bladder’s capacity to store urine until morning.

Other factors like sleep disorders can worsen the issue by raising the difficulty of arousal from sleep, and nocturnal polyuria increases urine production at night, both of which can contribute as well. Dehydration at night, by contrast, would typically reduce urine volume and is not a common driver of nocturnal enuresis.