Hemorrhoid surgery 15 days after the bowel movement is very painful, the possible reasons are surgical wound did not completely heal, wound infection, anal fissure and other reasons. 1. Surgical wound is not completely healed: If more tissues are removed during the surgery and the wound is larger, the healing speed will be slower after the surgery. If the wound is not completely healed 15 days after the operation, pain will occur after defecation. 2. Wound infection: if you don’t pay attention to cleaning and sterilizing the wound after surgery, the wound may be contaminated by urine and feces, causing local redness, swelling, heat and pain, and there will be pain after defecation. 3. anal fissure: after surgery, do not pay attention to personal diet and lifestyle habits, if there is a more serious constipation, dry stool, defecation stool through the anus leading to anal fissure, causing pain, may also be accompanied by bleeding. There are many reasons why it hurts to defecate after 15 days of hemorrhoid surgery, it is recommended to go to the hospital in time for a review, to clarify the cause and then deal with it under the guidance of the doctor, to avoid delaying the condition.