Constipation and bleeding one month after anal fissure surgery is due to the wound not healing, wound friction and other reasons, do a good job in the recovery of the body can be. 1. Wounds are not healed: after anal fissure surgery, it takes some time for the incision to heal, normally speaking, it takes about one month for the wound to heal, but a few patients will have prolonged time, if there is still constipation bleeding one month after the surgery, it means that the wound is not yet healed, and a small amount of bleeding is a normal phenomenon. 2. Wound friction: if the postoperative care is not appropriate, it is easy to lead to wound friction and bleeding, if the bowel movement is dry and scratches the skin or mucous membrane of the anal canal will also lead to bleeding phenomenon. You can use hemorrhoidal cream to relieve wound friction and bleeding. After anal fissure surgery, it is recommended to pay attention to good conditioning measures, avoid eating spicy and stimulating food, pay attention to the cleaning and disinfection of the incision in the anal area, and consult the doctor in time for active treatment to avoid delaying the condition.