[Lower urinary tract dysfunction: a common diagnosis in the pediatrics practice].

Lower urinary tract dysfunction indicates an abnormal function of the lower urinary tract to the child's age, which can lead to loss of coordinated capacity storage and elimination of urine. It is a common entity in children, although under-diagnosed in clinical practice, and that, besides representing a risk to the upper urinary tract, causes an emotional embarrassment to parents and children, due to urinary incontinence and frustration in dealing with the problem. The acquisition of daytime urinary continence occurs in most children until age 4 and night, until 5 years of age.