Injection therapy is still effective for hemorrhoids, however, it is only useful for the treatment of internal hemorrhoids. Injection therapy is to inject a sclerosing agent into the nucleus of the internal hemorrhoid, which causes the protein of the nucleus to denature and gradually shrink and stick to the intestinal wall, which can serve to relieve the symptoms of blood in the stool or the prolapsed swelling. However, it is only effective for stage I and II internal hemorrhoids, but not for larger internal hemorrhoids or those that often prolapse. It is generally not possible to treat stage III and IV internal hemorrhoids, and the recent effect is okay, however, because the nucleus is not fundamentally removed, there is still some risk of recurrence. The advantage of injection therapy is that it does not require surgery and is less painful; the disadvantage is that the long-term effect may not be particularly good and there may be a risk of recurrence.