Injection therapy is a kind of non-surgical treatment. 1869 Irish Morgan first used high iron sulfate solution for hemorrhoid injection, 1919 Findley in the British Journal of Pediatrics first reported that Professor D’Espine of Geneva used pure alcohol injection around the rectum to treat pediatric prolapse of the rectum. Domestic Feng Lanxin began to try out alcohol injection around the rectum in 1942 for the treatment of pediatric rectal prolapse, and achieved satisfactory results. 1, injection therapy in the application of anorectal diseases 1.1 internal hemorrhoids Ⅰ to Ⅲ internal hemorrhoids and parts of mixed hemorrhoids can be used injection method. Commonly used drugs and doses: ① 5% phenol dissolved in almond oil or peanut oil is the most commonly used injection component in the UK, the commonly used injection component in the United States is 2.4% anhydrous quinine – urea each hemorrhoid nucleus each injection 0.2 ~ 0.5ml; ② commonly used in China for the elimination of hemorrhoid injection (1:1) a total of 15 ~ 30ml. there are other Chinese medicinal preparations in China, such as compound chebulan liquid, hemorrhoid Ning injection, elimination of hemorrhoids The Chinese medicine is also available in China, such as compound chebulan liquid, hemorrhoid nin injection, anti-hemorrhoid liquid, Shuguang I, etc. Mechanism of action: All the drugs used as internal hemorrhoid injection, if the concentration is small, the injection dose is small, it causes tissue sclerosis without necrosis; after the injection of larger concentration and larger dose, all can cause internal hemorrhoid tissue necrosis. The sclerosing agent is injected into the submucosa of the hemorrhoid or into the interstitial space of the rectal plexus, causing lymph and protein coagulation in the hemorrhoid nucleus and a mild local chemical inflammatory reaction, then connective tissue proliferation and fibrous degeneration, which on the one hand compresses the dilated veins and arteries in the hemorrhoid area, blocking or reducing the local blood supply and causing the hemorrhoid nucleus to atrophy, and on the other hand increases the fixation of the hemorrhoid nucleus and its root in the muscle layer of the intestinal wall, thus reducing or eliminating the prolapse of the hemorrhoid. The prolapse of the nucleus. According to the first-class international anal hospital: St. Mark’s Hospital in the United Kingdom, 200 patients were followed up for 5 years, and all of them considered themselves cured within 5 years. 2. reactions and complications after injection and treatment of anal diseases There are no special treatment and precautions after injection therapy, and patients can resume normal activities on the same day. If the patient feels discomfort, he can rest for a day. Remind the patient that there may be swelling and pain in the perineal area, which is related to the penetration of the drug into the subcutaneous area and can be controlled by taking ordinary painkillers orally. The use of injection therapy for anal diseases is a proven, safe, reliable and simple treatment method. This is especially true for patients with associated bleeding.