Adult bedwetting can usually be caused by too much residual urine in the bladder due to drinking too much water before going to bed, prostate enlargement, diabetes, cerebrovascular disease and so on. 1. Physiological factors: no urination before going to bed, and drinking too much water, resulting in excessive residual urine in the bladder, thus resulting in filling incontinence. 2. Prostatic hyperplasia: mostly occurring in the elderly, along with chronic urinary retention, bedwetting may occur. 3. Diabetes mellitus: Due to the high concentration of blood glucose in diabetic patients, it cannot be utilized in the body and is filtered out from the glomerulus but cannot be reabsorbed by the renal tubules, forming osmotic diuresis, leading to excessive urination, which makes it easy for bedwetting to occur. 4. Cerebrovascular disease: bleeding or infarction in the brain causes damage to the center that controls bladder urination, which leads to adult bedwetting. There are also some pelvic surgeries, due to intraoperative damage to the nerve function of the bladder, bedwetting may occur. Excluding physiologic factors, the presence of adult bedwetting requires prompt medical attention.