Urinary incontinence is a condition where you are unable to control urination, such that urine is lost at the wrong time and place. During urination, the muscles in the wall of the bladder contract, forcing urine out of the bladder and into the urethra. At the same time, sphincter muscles surrounding the urethra relax, letting urine pass out of the body. Incontinence occurs if your bladder muscles contract suddenly or the sphincter muscles are not strong enough to hold back urine.