Open myomectomy does not affect a woman’s menstrual cycle, so she will still have her periods on schedule. In some cases, if the fibroid is so large that it penetrates the entire uterine cavity and damages the endometrium, the patient may experience postoperative vaginal bleeding as a result of stress and a small amount of bleeding from the endometrium. In this case, the patient’s menstruation is not usually delayed. After the vaginal bleeding has stopped, the patient’s ovaries will change periodically, so the woman’s menstruation will still follow her cycle. However, in this case, the menstrual flow is usually reduced, mainly because the endometrium is partially damaged during the operation and bleeding is partially removed, so the endometrium is relatively thin before the menstrual flow and the bleeding volume is relatively small.