Urinary incontinence may be caused by a wide variety of things, including urinary tract infection, bladder irritation, certain medications, interstitial cystitis, overactive bladder, pregnancy, and weakened urogenital tract muscles after childbirth.
Sources:
Chaudhary BN, Chadwick M, Roe AM. "Selecting patients with faecal incontinence for anal sphincter surgery: the influence of irritable bowel syndrome.." Colorectal Dis Aug 2010; 12:750-753. 6 Aug 2010.
Lui PD. "Interstitial Cystitis." The Merck Manuals Aug 2007. 6 Aug 2010.

