Hemorrhoids, commonly known as piles, are swollen veins in the rectum or anus. This condition is prevalent among people of all ages and genders and can be very uncomfortable and painful. Hemorrhoids, commonly known as piles, are swollen veins in the rectum or anus. This condition is prevalent among people of all ages and genders and can be very uncomfortable and painful. Hemorrhoids can be caused by various factors, including straining during bowel movements, sitting for prolonged periods, pregnancy, obesity, and a diet low in fiber. can be caused by various factors, including straining during bowel movements, sitting for prolonged periods, pregnancy, obesity, and a diet low in fiber.