I often encounter patients who ask me when I get a hemorrhoid and don’t feel pain, while another person’s hemorrhoid hurts, what is the reason? The nerve distribution above the dentate line is completely different from the nerve distribution below the dentate line. The nerve distribution above the dentate line belongs to the vegetative nerve that does not feel pain and is a painless zone, for example, internal hemorrhoids do not feel pain on the dentate line, and the nerve below the dentate line has a sharp pain sensation. For example, external hemorrhoids are painful and obvious.