Dark menstrual blood may be caused by stagnation of qi and blood stasis, such as in the menstrual period of anxiety, anger will affect the discharge of menstrual blood, in the menstrual period of cold caused by the uterine cold will also cause menstrual blood dark, gynecological inflammation will also cause menstrual blood dark. Endocrine disorders, tumors and cysts in the uterus can affect the color of menstrual blood, and it is best to go to the hospital for examination in time. If it is qi stagnation and blood stasis, you can take motherwort and other medicines under the guidance of your doctor. It is also recommended to pay attention to the menstrual period to keep in a relaxed mood, can not be anxious, angry, pay attention to abdominal warmth, appropriate drink brown sugar water, but also need to carry out gynecological examination, ultrasound examination. If there is pelvic inflammatory disease or vaginitis, you need to use anti-inflammatory drugs, such as metronidazole, tinidazole, etc., endocrine disorders need to be regulated with hormonal drugs, cysts or tumors need to be surgically removed for treatment.