Home > Medical > Piles (Haemorrhoids) > Overview What are haemorrhoids? Haemorrhoids (piles) are enlarged veins around the anal canal. Learn more Symptoms of haemorrhoids Bright-red blood on the stool could be a sign of haemorrhoids. What else should you look out for? Causes of haemorrhoids The most common cause of haemorrhoids is straining during bowel movements.