The term urinary incontinence refers to involuntary urine leakage. This is not classified as a disease. It is instead a symptom of a problem in the urinary tract. Urine is made by kidneys and the urinary bladder stores it. Urethra is the tube that connects the bladder to the penis through the prostate. A ring of muscles surround this tube and is known as the urinary sphincter. When there is urine in the bladder, it stays relaxed till the nerve signals direct the urinary sphincter to stay shut. This coordination between the nerves and muscles keep the urine from leaking.