Piles: Symptoms, causes, and treatments Piles (hemorrhoids) are swellings that develop inside and around the back passage (anal canal). There is a network of small veins (blood vessels) within the lining of the anal canal.

Piles: Symptoms, causes, and treatments
Piles (hemorrhoids) are swellings that develop inside and around the back passage (anal canal). There is a network of small veins (blood vessels) within the lining of the anal canal.