An endometrial polyp of 9*4mm is relatively large because the uterine cavity in an infertile state has a capacity of only 5 ml. An endometrial polyp of 9*4mm will have an impact on the menstrual cycle and the amount of menstruation. The normal uterine cavity in an infertile state has a capacity of about 5 ml. 9*4mm endometrial polyp is close to one centimeter, which is relatively large. It may affect the menstrual cycle and the amount of menstruation to a certain extent, resulting in increased menstrual flow and shorter menstrual cycles. If there is a 9*4mm endometrial polyp, you need to consult a doctor in time, and you can choose surgery to remove it under the doctor’s guidance. After removal, a biopsy of the pathologic tissue will be performed, and subsequent treatments will be chosen based on the biopsy results.