Hemorrhoid injection, also known as injection therapy, is more commonly used to treat hemorrhoids, and is more effective for stage II and III hemorrhoids. The main indications include internal hemorrhoids without complications, such as stage I internal hemorrhoids that are mainly bleeding and are not accompanied by prolapse, injection therapy works best because it is very effective in controlling bleeding and has a high cure rate. For stage II internal hemorrhoids, injection has the effect of preventing minor prolapse. For stage III internal hemorrhoids, injection therapy can later reduce prolapse symptoms and convert them to stage II hemorrhoids, which can be injected several times. Clinically, injection therapy is also suitable for patients who are old and weak, have severe hypertension, heart, liver and kidney diseases, and cannot tolerate conventional surgery using injection therapy treatment. However, it should be noted that injection therapy cannot be used for the treatment of external hemorrhoids, which can produce very intense pain using injection therapy and may also cause postoperative anal stenosis. Internal hemorrhoids should also not be treated with injection therapy if they are accompanied by embolic infection or erosion.