What Are Thrombosed Haemorrhoids: In-Depth Overview Piles, also known as swollen rectal veins, are inflamed veins in the rectal area. If a clot develops in a haemorrhoid, it causes a thrombosed pile—a debilitating condition requiring attention. This article will guide you through the symptoms, triggers, and solutions for thrombosed haemorrhoids. http://That subreddit doesn't exist