The calculation of the menstrual cycle after hysteroscopic surgery generally starts from the date of the hysteroscopic surgery as the first day of menstruation, and the corresponding date of menstruation is projected from there. During the hysteroscopic procedure, in addition to the exploration of the uterine cavity, endometrial scraping is also performed to understand the pathological state of the endometrium. After the endometrial scraping, the endometrium is restored to its thinnest physiological state, and then gradually thickens and secretes under the action of estrogen and subsequent progesterone, and then peels off the endometrium when estrogen and progesterone are lowered. Therefore, the first day of the menstrual cycle after hysteroscopic surgery starts from the day of the hysteroscopic surgery.