Nocturia in 8-year-old children may be caused by developmental delay, insufficient secretion of antidiuretic hormone, and disorders of bladder function. 1. Developmental delay: when the bladder is full, it can’t send enough information to the cerebral cortex, so the brain can’t control the center of urination and can’t hold the urine, which will be discharged on its own, leading to nocturia. 2. Insufficient secretion of antidiuretic hormone: 8-year-old children may have insufficient secretion of antidiuretic hormone at night, which can lead to lead to increased nocturnal urination and the symptoms of bedwetting. 3. Dysfunction of the bladder: some pediatric enuresis has a functional bladder, the volume of which does not correspond to the bladder capacity of a normal child, leading to bedwetting. If the symptoms of nocturnal enuresis in 8-year-old children do not improve for a long time, they should go to the hospital in time and be treated after diagnosis by a professional physician.