What causes stress sui?

"SUI" Stress urinary incontinence (sui) is when physical movement like heavy lifting, coughing, or sneezing causes accidental leaks of urine. It happens when there is poor function in the pelvic muscles that support the bladder or control the release of urine. This can result from childbirth, pregnancy, or pelvic surgery. For more, see http://www.Mayoclinic.Com/health/stress-incontinence/ds00828.