Hemorrhoids are veins in the tissues at the opening of the anus that become enlarged.
A person who has hemorrhoids may also have clots forming in the hemorrhoid tissue. Your bowel may treat the clots like a bowel movement and try to push them out of your body. Hemorrhoid banding is a procedure in which the doctor puts a tight band around the hemorrhoid to control bleeding. Then the doctor will either remove the blood clot or let it wither and heal on its own. Hemorrhoid banding is one method of treating hemorrhoids.