External hemorrhoids may become thrombosed when blood clots develop inside the lump itself. This can make the lump extremely sensitive from irritation caused by any activity, even walking or sitting. External hemorrhoids, and some prolapsed internal hemorrhoids, are removed by conventional surgery in a hospital. Depending on the circumstances, this requires a local, regional, or general anesthetic. External hemorrhoids are kind of default hemorrhoids. When we talk about hemorrhoid problems, EH are usually what we mean.