Menstruation is very few, what problem is color very black

Female menstrual blood color is black may be caused by the presence of congestion in the uterus, may also be kidney deficiency, blood stasis caused. Female menstrual volume is more, leading to menstrual blood stasis in the uterus is a common cause of this performance. Suggestions: women can eat donkey-hide gelatin, red dates and other foods with the effect of activating blood stasis conditioning body.