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These lie inside the rectum. Hemorrhoids are swollen veins in your lower rectum. Seek emergency care if you experience large amounts of rectal bleeding, lightheadedness, dizziness or faintness. Some people find that boosting fiber causes bloating or gas. Hemorrhoids HEM-uh-roidsalso called piles, are swollen veins in your anus and lower rectum, similar to varicose veins. Mayo Clinic Marketplace Check out these best-sellers and special offers on books and newsletters from Mayo Clinic. Internal hemorrhoids are typically painless, even when they produce bleeding.