Understanding Thrombosed Haemorrhoids: Everything You Should Know Piles, Commonly known as swollen rectal veins, are enlarged veins in the anal area. If a clot develops in a haemorrhoid, it causes a thrombosed haemorrhoid—a debilitating condition requiring attention. Below, explore the signs, causes, and solutions for this painful condition. ### Understanding https://www.zupyak.com/p/4593967/t/what-are-thrombosed-haemorrhoids-or-piles