Purpose To investigate the prevalance of constipation among children presenting with bedwetting. Material and Methods Charts of children applying with only bedwetting complaint were evaluated. Those with daytime voiding symptoms and urinary tract infections were excluded. Symptoms of voiding dysfunction were sought with detailed history. Parents were given questionnaires designed to reveal constipation according to Rome III criteria, and they were filled after at least one month of observation without any treatment. Diagnosis of constipation was made when direct graph revealed an intestinal fullness obscuring the rectal image and/or when the symptoms fulfilled the Rome III criteria. Results A total of 88 patients were evaluated (female:24, male:64, mean age: 8.65 yrs). Primary and secondary enuresis nocturna (EN) was diagnosed in 79 and 9 patients respectively. Constipation was diagnosed in 62% and 67% of the patients with primary and secondary EN respectively. Daytime irritative symptoms coexisted in 20.5% of the cases, and when these cases were excluded, constipation existed in 53.2% of the cases with primary monosymptomatic enuresis nocturna. This is a higher rate than the similar population according to the literature. Conclusions A significant rate of constipation coexist in patients presenting with bedwetting, and these cases should not be labelled as monosymptomatic nocturnal enuretics. This subgroup of patients should be identified as cases with elimination dysfunction and treated accordingly. Lack of daytime voiding symptoms do not exclude defecation disorders.