After endometrial polyp surgery, the first menstrual period is still not over after 6 days, it may be a normal phenomenon, or it may be caused by endocrine disorders, inflammation and other factors. 1. Normal phenomenon: the normal menstrual period lasts from 2 to 8 days. After endometrial polyp surgery, it is possible that menstruation is normal and not caused by other reasons. 2. Endocrine disorders: postoperative stress, lack of sleep and rest, short temper, may lead to hormonal disorders in the body, may cause prolongation of the menstrual period. 3. Inflammation: not paying attention to care after surgery, leading to the occurrence of infections such as pelvic inflammatory disease, cervicitis may lead to prolonged menstrual period, accompanied by abnormal leukorrhea, pain in the lower abdomen and other symptoms. There are many reasons why menstruation does not end after 6 days after surgery, you should go to the hospital in time, improve the relevant examination to clarify the cause, and treat the symptoms under the guidance of the doctor.