A small amount of bleeding more than twenty days after surgery for uterine polyps may be caused by endometrial damage, post-treatment reaction, infection and other reasons. 1. endometrial damage: endometrial polyps surgical treatment may cause extensive damage to the endometrium, the trauma bleeding can last for a long time, resulting in a small amount of bleeding more than twenty days after surgery for uterine polyps. 2. Post-treatment reaction: endometrial polyp surgical treatment bleeding more, the root is larger, the need for electrocoagulation to stop bleeding. Postoperative coagulation of the site of the blood crust shedding, can cause uterine polyps more than twenty days after surgery and a small amount of bleeding. Cervical polyps in electrocision, postoperative trauma absorption, can cause more than twenty days after surgery and a small amount of bleeding. 3. Infection: endometrial polyp postoperative trauma infection, can cause necrosis of the trauma, bleeding lasts more than twenty days; cervical polyp postoperative trauma infection, can lead to more than twenty days after surgery and bleeding. If you are bleeding for more than twenty days after uterine polyp surgery, you must go to the hospital in time, complete the examination under the guidance of the doctor, find out the cause and give appropriate treatment.