There are many reasons for bedwetting in adults, including urinary retention, neurological abnormalities and other conditions, which may result in involuntary urine outflow and bedwetting manifestations. 1. Urinary retention: patients due to certain urinary diseases, bladder sphincter relaxation, the symptoms of urinary retention, after urination, there is still a lot of urine retention in the bladder, resulting in a decrease in the effective volume of the bladder, the accumulation of urine flow into the bladder during the night, more than the bladder volume, the urine will be leaked from the urethral orifice involuntarily, the manifestation of bedwetting. 2. Neurological abnormalities: some neurological disorders, resulting in patients with bladder, as well as the urethral sphincter function decline, in which case the patient in the process of sleep, the accumulation of urine in the bladder at night is more than the urethral resistance, which will lead to patients with nighttime bedwetting. Adult nighttime bedwetting occurs, it is recommended to go to the hospital urology department in time for examination and treatment.