Read more. Read clinical updates and the latest insights from Boston Children's specialists. Learn more. Talk to your healthcare provider about getting your child immunized today. The rectum is the lower portion of the large intestine.
Hemorrhoids are anal blood vessels that are a normal part of your anatomy. They can be internal—blood vessels found in the moist tissue of the inner lining of the anus. They also can be external—blood vessels found under the skin just outside the anus. Hemorrhoids can become abnormal and problematic when they become dilated or engorged. Having abnormal hemorrhoids can be referred to as hemorrhoidal disease.
Hemorrhoids are uncomfortable swollen veins in the rectum or anus. Internal hemorrhoids swell inside the anus, and external hemorrhoids swell near the opening of the anus. During a bowel movement, the anal tissue swells with blood to help control movement.