A fistula is an abnormal connection via a tunnel-like hole between two organs or vessels. Fistulas can occur in various parts of the body. In women, fistulas involving the genital and urinary tracts are the most common and happen due to prolonged or obstructed childbirth, injury during pelvic surgery, infection, inflammation, or radiation treatment in the pelvis or genital area. The most common fistulae in women is one that occurs between the bladder and vagina known as a vesicovaginal fistula and one that occurs between the rectum and vagina known as a rectovaginal fistula.
An anal fissure is a small tear of the skin around the back passage anus. An anal fissure that lasts more than six weeks is called a chronic anal fissure. It may not be an issue you make a habit of discussing with your friends, but lots of us get to learn about anal tears fissures the hard way. They're not usually serious but they are most definitely painful!