The fact that there is always blood down there instead of menstruation may be related to the following three aspects: 1) pregnancy-related causes need to be ruled out. 2) abnormal uterine bleeding caused by endocrine disorders need to be ruled out. 3) cervical pathology needs to be ruled out. It is recommended to check the blood or urine pregnancy test, if it is negative, abnormal uterine bleeding caused by pregnancy can be ruled out. It is recommended to continue to carry out obstetrics and gynecology ultrasound examination to determine the thickness of the endometrium. If the lining is thin, it is recommended to apply anti-hemorrhagic and anti-inflammatory drugs, which may be related to endocrine causes. If the lining is thicker and hemoglobin is within the normal range, it is seen as progesterone withdrawal bleeding. Of course, routine obstetrics and gynecology examinations should be performed to determine whether the cervix is normal and to exclude cervical pathology.