If a woman has a lot of black blood clots during her menstrual period, but her menstrual flow is within the normal range, she may consider taking herbs that activate blood circulation, remove blood stasis and move qi to regulate the blood flow. If a woman simply has black blood clots during menstruation and her menstrual flow is less than 20ml, she needs to check ultrasound and sex hormone 6 to determine the specific cause. If the manifestation is due to polycystic ovary syndrome, resulting in the absence of ovulation, you can consider taking Daying-35 to regulate the treatment, and if it is caused by low estrogen with low menstrual flow, you can take estradiol valerate tablets to regulate.