Sometimes they go away by themselves, but in other cases they can cause lingering pain, itching, and bleeding. There are 2 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.ometimes they go away by themselves, but in other cases they can cause lingering pain, itching, and bleeding. There are 2 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.