Nocturnal enuresis: The age and frequency of enuresis are still controversial, both nationally and internationally, and among different disciplines. According to the definition developed by the International Childhood Urinary Control Association in 2006, nocturnal enuresis is defined as involuntary leakage of urine during sleep, at least twice a week for ≥3 months, in children >5 years of age without central nervous system pathology. In some pediatric guidelines its defined age is 3 years. Nocturnal incontinence and other causes of nocturnal bedwetting are now collectively referred to as nocturnal enuresis, which is subdivided into monosymptomatic nocturnal enuresis and compound nocturnal enuresis. 1.Monosymptomatic nocturnal enuresis: Only nocturnal enuresis without other combined lower urinary tract symptoms. According to the characteristics of enuresis, it can be further divided into primary and secondary enuresis. (1) Primary enuresis: enuresis in which the symptoms persist since childhood (asymptomatic period not exceeding 6 months). (2) Secondary enuresis: enuresis that has had an asymptomatic period of at least 6 months and then occurs again. (2) Nonmonosymptomatic nocturnal enuresis: It refers to nocturnal enuresis combined with lower urinary tract symptoms or bladder dysfunction, including daytime urinary frequency, urinary urgency, urinary incontinence, difficulty urinating or lower urinary tract pain.