Injections are not used to treat external hemorrhoids. Injections for hemorrhoids are commonly called injection therapy and are generally used to treat internal hemorrhoids. Internal hemorrhoids with recurrent bleeding symptoms can be controlled using injection therapy, the principle of which is to control the bleeding symptoms by injecting drugs, mostly sclerosing agents, into the nucleus of the hemorrhoid, causing local fibrosis of the nucleus, vascular embolism, and adhesions. However, injection therapy is less effective in the treatment of hemorrhoids such as internal hemorrhoids with prolapsed symptoms. Minor internal hemorrhoid prolapses can be treated with injection therapy, but there is a risk of recurrence in the short term. For external hemorrhoids, if injection therapy is used, patients will experience severe anal pain, local necrosis of the hemorrhoid nucleus at a later stage, and possibly serious complications such as anal stenosis and anal incontinence.