Postoperative pain after hemorrhoid surgery is usually moderate within a week after surgery, while it becomes mild after a week. Clinically, the pain is rated on a scale of 1-10 according to the patient’s own sensations, with 1-3 being mild pain that does not affect the patient’s sleep. While 4-7 is classified as moderate pain, moderate pain will affect the patient’s sleep, but eventually the patient is still able to sleep. While 8-10 is categorized as severe pain, patients will not be able to sleep because of the pain, and often need to resort to sleep medication in order to fall asleep. Therefore, many clinicians will inject melphalan around the anal incision during the surgery. Melphalan is a long-acting pain medication that lasts about 1-2 weeks after the surgery, but on the night of the surgery, there may be a significant burning sensation in the anal area.