Stress Urinary Incontinence (SUI) is when urine leaks out with sudden pressure on the bladder and urethra, causing the sphincter muscles to open briefly. With mild SUI, pressure may be from sudden forceful activities, like exercise, sneezing, laughing or coughing. If your SUI is more severe, you may also leak with less forceful activities like standing up, walking or bending over. Urinary “accidents” like this can range from a few drops of urine to enough to soak through your clothes.