Nocturnal enuresis, or nightly bedwetting in children more than 7 years of age, affects about 10% of 7-year-old children, with a wide range of frequencies between populations. The affliction is often linked to major social maladjustments and occupies ... Nocturnal enuresis, or nightly bedwetting in children more than 7 years of age, affects about 10% of 7-year-old children, with a wide range of frequencies between populations. The affliction is often linked to major social maladjustments and occupies considerable time in general medical practice. From the age of 7, there is a spontaneous cure rate of 15% per year, such that few remain affected after the age of 16 years. There are 2 types of nocturnal enuresis: type I, the primary form (PNE), with at least 3 nightly episodes in children older than 7 years, where the child has always had the disorder, and type II, or secondary type, where the child has been dry for at least 6 months but enuresis has recurred (summary by Eiberg et al., 1995). - Genetic Heterogeneity of Nocturnal Enuresis ENUR1 has been mapped to chromosome 13q, and ENUR2 has been mapped to chromosome 12q.