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Those are called hemorrhoids veins located near the anus or inside the rectum, which have been swollen by abnormal accumulation of blood because of too high pressure, in a repeatedly occurs inside. If hemorrhoids occur inside the rectum (internal hemorrhoids) do not cause pain, but sometimes give rise to significant bleeding. The veins inside the rectum can stretch and even get out of the year, in which case they can be painful. In this circumstance we say that we have a prolapsed hemorrhoid, which itself can return to your site.
Hemorrhoids that are outside the anus are easy to see and feel. The swollen veins may bleed if scratched or broken by straining, rubbing or wiping. It may sometimes itch, and sometimes tear and bleed. If a blood clot, the patient will notice a tender lump in the anal verge.