The physiology of micturition demonstrates some changes in childhood with growth. The bladder is an autonomic organ that is controlled voluntarily via its receptors and their localizations. Voluntary control of micturition occurs when the act of central nervous system to consciously initiate and finish voiding becomes dominant. During the first years of life, the detrusor muscle is more reactive and bladder sphincter dys-synergia may be present. Dysfunction of micturition may appear as a result of dysfunction in the lower urinary tract consisting of the bladder and urethra. The causes of lower urinary tract dysfunction can be classified as anatomical, neurological, and functional voiding disorders and these causes can be differentiated using the medical history and physical examination of the patient. It is very important to be careful for urinary tract infection and vesicoureteral reflux in cases with lower urinary tract dysfunction. First-line therapy includes regulating fluid intake, providing timely voiding in adequate frequency, overcoming constipation, and hygiene training.