Menstruation first day menstruation blood color blackens how to return a responsibility

The first day of female menstruation appears black color phenomenon, belongs to normal physiological phenomenon. If there are abdominal pain symptoms, can also be considered due to endometriosis, pelvic inflammatory disease and other gynecological inflammation caused. It is recommended to go to the hospital in time for obstetrics and gynecology, B ultrasound and other examinations.