Black period, this may be caused by cold in the uterus, in addition there may be blood stasis, if the uterus is cold, also easy to cause dysmenorrhea and other conditions. It is best to keep the abdomen warm, and it is advisable to take warming herbs under the guidance of a doctor. It is advisable to pay attention to strengthening diet and nutrition, and it is best not to eat cold, stimulating food during menstruation. You can drink brown sugar water and pay attention not to eat cold foods such as white radish and green tea. If the blood is stagnant, you can take blood-stimulating drugs under the guidance of a doctor, such as motherwort, etc. At the same time, it is recommended to pay attention to adequate sleep, in addition to pay attention to menstrual hygiene to avoid gynecological infections, gynecological infections can also cause menstrual blackness, if there is a gynecological infection, it is best to use timely medication, such as anti-inflammatory suppositories, but it is best to wait until the menstruation is clean.