Understanding Thrombosed Haemorrhoids: A Complete Guide Haemorrhoids, commonly known as swollen rectal veins, are dilated veins in the anal-rectal area. When a blood clot forms inside one, it leads to a thrombosed pile—a disruptive condition requiring attention. Below, explore the symptoms, triggers, and solutions for this painful condition. ### Definition https://www.zupyak.com/p/4593967/t/what-are-thrombosed-haemorrhoids-or-piles