Menstruation is a special physiological phenomenon for women. Generally speaking, normal menstruation’s is dark red, odorless, sticky, non-coagulated blood, in addition to blood, there are some endometrial fragments, cervical mucus, etc. However, many women have abnormal menstruation, such as low menstrual volume or black menstruation, etc. What is the matter with black menstruation? Many women with black menstruation are caused in large part by improper menstrual care, such as drinking, smoking, or strenuous activities during menstruation, not paying attention to rest, staying up late during menstruation, or having sex without restraint, etc. This can cause black menstrual blood during menstruation. Gynecological inflammation, such as pelvic inflammatory disease, endometritis, tubal inflammation, etc., can also cause poor flow of menstrual blood in the uterus, resulting in the accumulation of menstrual blood in the uterine cavity, which is manifested in the appearance of black menstrual blood. Endocrine disorders or too many miscarriages in women can cause the normal menstrual cycle to be broken and the estrogen level to decrease, resulting in the stagnation of menstrual blood during menstruation and causing the dark color of menstrual blood. Or tumors or abnormal development of the reproductive system may cause darkening of menstrual blood. In order to prevent abnormal menstruation from occurring, women must keep a happy mood, and learn to self-regulate during menstruation when there is lumbar soreness, lower abdominal rise, emotional instability, etc. Pay attention to personal warm water, and must not have sex during menstruation to avoid menstrual blood reflux, causing diseases such as endometriosis in the pelvis, pay attention to avoid eating cold, sour and spicy stimulating foods, drink more water, and keep bowel movements open. If the menstrual blood is black and accompanied by severe abdominal pain, you must go to the hospital in time.