In the afternoon of December 1, 2014, Xiaofeng, a nurse in the obstetrics clinic of our maternal and child health hospital, brought her sister to my specialist clinic and told her situation: her 24-year-old sister, a white-collar worker in a company who had not yet had children and had a regular boyfriend, had repeatedly experienced excessive menstruation or prolonged menstruation for almost a year, sometimes extending for 20 days, which seriously affected her normal work and life. She had taken herbs and western medicine to regulate her month, but the effect was not good. I checked her previous female hormone blood test results which were generally normal. She was advised to undergo a vaginal ultrasound, which showed an endometrial polyp of about 1.0 x 1.3 cm, which was the cause of the excessive or prolonged menstruation. I recommended her to be admitted for painless endometrial polyp electrosurgery. The surgery went well and she was discharged in 4 days. Her menstruation was finally normal. Endometrial polyp is a common gynecological disease, which brings some hidden danger to women’s reproductive health, endometrial polyp is mostly caused by the development of chronic endometritis or myometritis, but it may also be due to foreign body in the uterine cavity, placental residue with infection, etc. Endometrial polyp is another type of chronic endometritis. If the polyp is too much and causes irregular vaginal bleeding, surgery is usually recommended to remove the polyp. Symptoms of endometrial polyps are mainly increased menstrual flow or irregular uterine bleeding, which may be manifested as shortened cycles, prolonged periods, and bleeding for up to one month. The polyps are seen or palpated at the cervical opening, and the uterine body is slightly enlarged; hysteroscopy or segmental scraping and sending the removed tissue or polyps for pathological examination can make a clear diagnosis, and can be differentiated from dysfunctional uterine bleeding, submucosal uterine fibroids and endometrial cancer. Endometrial polyps can occur at any age after puberty. Smaller single endometrial polyps often have no clinical symptoms and are often detected during gross examination after removal of the uterus due to other diseases, or after diagnostic scraping. Multiple diffuse polyps are commonly associated with increased menstrual flow and prolonged menstrual periods, which are associated with increased endometrial area and excessive endometrial hyperplasia. Large polyps or polyps protruding into the cervical canal are prone to secondary infection and necrosis, causing irregular bleeding and foul-smelling bloody discharge. The main symptoms of endometrial polyps are irregular menstruation, irregular bleeding from the uterus and infertility. The treatment of endometrial polyps must be very timely. For patients over 45 years old, total hysterectomy can be considered if the bleeding symptoms are obvious and recur frequently. Younger women and women with reproductive requirements have polyps removed by hysteroscopic surgery and scraped at the same time, and the tissue is sent for examination. Lastly, endometrial polyps may cause infertility, as endometrial polyp congestion in the uterine cavity prevents sperm and egg retention and implantation, placental implantation and embryonic development. Combined infection alters the intrauterine environment, which is not conducive to the survival of sperm and eggs. Combined tubal or ovarian infections may cause obstructive or anovulatory infertility.