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When a patient has external hemorrhoids, they will lie under the skin around the anus. They can become very itchy and may bleed. Sometimes, the blood may accumulate and form a thrombus (clot), which can be painful; the area will swell and become inflamed. External hemorrhoids are more likely to present with pain.
Hemorrhoids are swollen veins in the lowest part of your rectum and anus. Sometimes the walls of these blood vessels stretch so thin that the veins bulge and get irritated, especially when you poop. Swollen hemorrhoids are also called piles. Hemorrhoids are one of the most common causes of rectal bleeding. They're rarely dangerous and usually clear up in a couple of weeks. But you should see your doctor to make sure it's not a more serious condition. He can also remove hemorrhoids that won't go away or are very painful.