Twice menstruation in a month is considered to be related to endocrine disorders, ovulation bleeding, uterine fibroids, endometrial cancer and so on, so it is not necessarily endometrial cancer. 1. Endocrine disorders: if the patient has a high work pressure or combined with gynecological endocrine diseases such as polycystic ovary syndrome, irregular ovulation will lead to irregular vaginal bleeding such as menstruation twice a month. 2. Ovulation bleeding: if a woman experiences vaginal bleeding 7 to 10 days after her menstrual period, she should be alert to the manifestation of ovulation bleeding. As the level of estrogen in the body decreases significantly after ovulation, the endometrium will be stripped irregularly, so there will be a small amount of vaginal bleeding, and the vaginal bleeding can be stopped in 2 to 3 days. 3. Uterine fibroids: If the patient has uterine fibroids, it will make the uterus shape irregular and the surface area of endometrium enlarged, and abnormal uterine bleeding such as twice menstruation in a month may occur. 4. Endometrial cancer: if the cancer cells proliferate abnormally, the patient may have irregular menstruation such as having menstruation twice a month, which is mostly seen in perimenopausal or menopausal women. For patients who have menstruation twice a month, it is recommended that they go to the gynecology department of regular hospitals to improve ultrasound, sex hormone and other relevant examinations, and then take active treatment under the guidance of doctors after clarifying the cause of the disease.