Hemorrhoid occur when veins in the rectum or anus become swollen and painful. Sometimes they go away by themselves, but in other cases they can cause lingering pain, itching, and bleeding. There are two types of hemorrhoids: those that are just inside the anus or lower rectum (internal) and those that are outside the opening to the anus (external). You can have both at the same time.
Internal hemorrhoids usually don’t cause pain or discomfort, while external hemorrhoids often do. However, internal hemorrhoids can protrude outside the anus (prolapsed hemorrhoid) and become painful. In some cases, a blot clot (thrombosis) may form in the vein, making the hemorrhoid more painful. Sometimes these hemorrhoids require surgery.
Hemorrhoids are common ailments. By age 50, about half of adults have had to deal with the itching, discomfort and bleeding that can signal the presence of hemorrhoids.