Fistula is an abnormal passage between a hollow or tubular organ and the body surface, or between two hollow or tubular organs
Arteriovenous fistula-
An abnormal connection between an artery and a vein.
Anal fistula-
An infected tunnel between the skin and the anus.
Obstetric fistula
-An abnormal connection between the rectum and the vagina.
Piles – Hemorrhoids-
Swollen and inflamed veins in the rectum and anus that cause discomfort and bleeding.Haemorrhoids are usually caused by straining during bowel movements, obesity or pregnancy.
Discomfort is a common symptom, especially during bowel movements or when sitting. Other symptoms include itching and bleeding.Pain in the anal region – can be even without straining in many cases.