If you have a catheter and still leak urine after prostate cancer surgery, it may be due to a problem with the catheter or the bladder. 1. Problems with catheter: If the type of catheter placed after surgery does not match, it is difficult to make the urethral sphincter close tightly with the urethra, thus urine leaks out from the side of the catheter; if the quality of the catheter is problematic, there is a breakage of the catheter itself, and leakage of urine will also occur. 2. Urinary incontinence: Radical prostate cancer surgery can easily damage the pelvic anatomical structure in the process of removing tumor, which will cause damage to bladder sphincter and peripheral nerves, thus causing different degrees of incontinence and urine leakage. If urine leakage occurs after surgery, it is recommended to inform the medical staff to check the catheter for any abnormalities and screen for urinary incontinence.