Hemorrhoids, also called piles, happen when clusters of veins in your rectum or anus get swollen or dilated. When these veins swell, blood pools and causes the veins to expand outward into the membranes around your rectal and anal tissue. This can become uncomfortable or painful. But when they expand, they can look like red or discolored bumps or lumps. In fact, less than 5 percent of people who get hemorrhoids have symptoms.
Anal cancer is a type of cancer that forms in tissues of the anus. The anus is the opening of the rectum to the outside of the body and at the end of the GI tract. Sometimes anal cancer causes no symptoms at all. But bleeding is often the first sign of the disease. The bleeding is usually minor.
NCBI Bookshelf. We all have hemorrhoids. Together with a circular muscle called the anal sphincter, they help to control bowel movements. Some might be afraid of having a physical examination or finding out that they have a serious illness. But seeing a doctor about your symptoms is important if you want to have the right treatment.