Urinary incontinence (UT) has considerable impacts on quality of life (QOL) and the num- ber of patients of it increases by age. Classifying UT based on the pathophysiology, it includes stress urinary incontinence (SUI), urgency urinary incontinence (UUI), overflow incontinence and functional urinary incontinence. SUI alone is the most common among female with UI, followed by mixed urinary incontinence of SUI and UUI, and UUI alone. Among male with UI, UUI and overflow incontinence associated with benign prostatic hyperplasia are fre- quently observed. In this article, the pathophysiology and treatment of UI are described and discussed.