What happens to menstrual blood black?

Menstruation blood black is considered to be caused by qi stagnation and blood stasis, emotional depression, irregular work and rest, excessive pressure, improper diet and other conditions are easy to lead to qi stagnation and blood stasis, you can take some drugs to promote blood circulation and remove blood stasis under the guidance of doctors to relieve symptoms, eat more warm tonic food during menstruation, such as red dates, etc.