Low menstrual flow and dark color, mainly due to the following reasons: First, if you take short-acting contraceptives in the clinic for a longer period of time, it will cause the endometrium to become thin, the amount of menstruation is reduced, and the color is dark, this situation is recommended to stop the use of contraceptive pills, and change to other methods of contraception, usually after the cessation of the drug, the menstruation gradually will return to normal, and the color will also change. Second, due to endocrine disorders, due to ovarian dysfunction, resulting in a decline in estradiol, it will occur in the menstrual flow will be reduced, the color will also appear darker, it is recommended that the next day of menstruation blood test sex hormone six, to understand whether the ovarian function is normal. Low menstrual flow and dark color, if there is a history of normal sexual life without contraception, first rule out the possibility of pregnancy.