Nocturnal enuresis and nocturia, differences and similarities - lessons to learn?

This review highlights the current views on and differences and similarities between nocturnal enuresis (NE) in children and nocturia in adults, which might be a guidance to elucidate the missing links in our knowledge. In both conditions, a genetic factor is suspected. Reduced bladder capacity and nocturnal polyuria are the main underlying lower urinary tract-related conditions. There is a link with sleep disorders, although it is not clear whether this is a cause or consequence. Physical and mental health are comprised in both conditions, however, in different ways. In NE, constipation and attention deficit disorder are the most important comorbidities and the effect on mental health and quality of life is mainly through the negative impact on self-esteem. In nocturia, cardiovascular disease and fall injuries are important comorbidities, mainly affecting the older nocturia population; personal distress and depression are consequences of the related poor sleep quality. For both conditions, treatment is often inadequate and a more individualized approach seems to be necessary. The main difference between NE and nocturia seems to be the difference in arousal to bladder stimuli, suggesting that sleep characteristics might be a key factor in these conditions.