The black color of menstrual blood is normal for most women, but it is not normal for some. For most women who are approaching the end of their menstrual period, black menstrual blood is normal, mainly related to the low volume of menstrual flow, slowing down the speed of discharge and retention in the vagina to oxidize to a certain extent. In addition to the black color, it may also be brown in color, and will not be accompanied by other uncomfortable symptoms such as vulvar itching or lower abdominal pain. It is not normal for menstrual blood to be black and accompanied by other uncomfortable symptoms. Some women who have black menstrual blood towards the end of their menstrual period need to be wary of vaginitis, cervicitis, pelvic inflammatory disease and other gynecological disorders, which should be taken seriously. Women should pay attention to strengthening personal hygiene care during menstruation, changing underwear, changing sanitary napkins, preventing infections, developing good habits, and avoiding late nights. It is recommended that the menstrual period is almost over, black blood, and accompanied by uncomfortable symptoms of the regular hospital examination, in order to clarify the disease and follow the doctor’s instructions for treatment.