Internal hemorrhoid injection therapy is a method of treating internal hemorrhoids and controlling their symptoms by injecting a sclerosing agent into the nucleus of the hemorrhoid. The harm of internal hemorrhoid injection therapy is not harmful if the operating doctor is skilled and operates strictly according to the rules. The main problem is a small amount of local bleeding, local swelling and pain, and a feeling of bowel movement after the procedure, and the symptoms will be relieved in 2-3 days. If the operation is not done properly, it may cause more serious consequences, such as entering the needle too deeply and easily injuring the muscle layer of the intestinal wall, which may lead to local infection and edema. If the injection position is too low, the drug may spread to the anal verge below the dentate line, causing edema, pain or local tissue necrosis around the anal verge.