What causes urine to leak from the vagina?

A fistula. A vesicovaginal fistula in an abnormal connection between the bladder and the vagina. This could lead to a constant leakage of urine from the vagina. It can be caused by abnormal healing after surgery, or obstructed labor, especially in developing countries. A gynecologist or urologist who specializes in female urology can help diagnose and correct this problem, usually with surgery.