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