The darkening of menstrual blood after menopause may be normal and related to endocrine disorders; it may also be abnormal and related to endometritis. When a woman is approaching menopause, the ovarian secretion function will decline, the ovary does not secrete progesterone without ovulation, only estrogen stimulates endometrial hyperplasia, there is no progesterone antagonism, resulting in endometrial hemorrhage repair difficulties, there is a small amount of vaginal bleeding, the deposition of oxidized to black in the vagina, the menstrual blood discharged is black, which is generally a normal phenomenon. Women almost menopausal endometrial inflammation, inflammation will accelerate the oxidation of blood, discharged from the body when the performance of the black, this situation is considered abnormal, the patient at this time may be accompanied by lower abdominal pain, leucorrhoea, lumbar acid abdominal distension. Whether or not it is normal for menstrual blood to turn black after menopause, we should go to the hospital and combine the clinical symptoms with the examination, and let the professional doctor make a comprehensive judgment.