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Wikipedia
Hemorrhoids (or haemorrhoids), also known as piles, are vascular structures in the anal canal.
Patient UK
Piles (haemorrhoids) are very common but not something you'll want to talk to your friends about. We don't know precisely how common piles are because many piles are small and not seen by a doctor.
Clinical review
Increased understanding of the anatomy of haemorrhoids has led to the development of new procedures to treat them.
Prevention is best
Haemorrhoids and their symptoms are one of the most common afflictions in the Western world.