Understanding Thrombosed Haemorrhoids: A Complete Guide Piles, Commonly known as swollen rectal veins, are inflamed veins in the anal area. If a clot develops in a haemorrhoid, it causes a thrombosed haemorrhoid—a painful condition requiring attention. Below, explore the symptoms, triggers, and treatment options for thrombosed haemorrhoids. ### Understanding Thrombosed https://www.zupyak.com/p/4593967/t/what-are-thrombosed-haemorrhoids-or-piles