There are more reasons for the darkening of the menstrual flow, which may be caused by psychological factors, uterine operations, gynecological inflammation and other reasons.
1. Psychological factors: such as emotional tension, low, irritable, irritable, depression, etc., and mental emotions through the central nervous system to affect the hypothalamus – pituitary – ovary axis, endocrine disorders occur, resulting in low menstrual flow and black.
2. Uterine operation: it may be due to multiple abortions, scraping, purging, etc., which may cause endometrial damage, uterine cavity or cervical adhesions can make the menstrual flow decrease. Menstrual blood can not flow out in time, retained in the vagina or uterine cavity, affected by acidic pH and then oxidized, appearing menstrual flow black.
3. Gynecological inflammation: such as vaginitis, cervicitis, pelvic inflammatory disease, etc., under the stimulation of inflammation, can make the endometrium thickening, shedding abnormalities, thus appearing in the menstrual flow, dark, prolonged menstrual period and other symptoms.
The darkening of the menstrual flow may also be caused by other reasons, it is recommended that the patient go to the hospital in time to improve the relevant examination, and follow the doctor’s instructions for treatment, to avoid delaying the condition.