If you drink black soy milk regularly, it may affect your menstruation, and for the menstrual flow may appear to increase. Because black soy milk contains phytoestrogens, drinking it regularly may cause the endometrium to thicken and therefore increase the menstrual flow. If the clinical volume of menstruation exceeds 80ml, it is recommended to drink less black soy milk in daily life to avoid anemia. In addition, menstruation is influenced by the environment and by emotions. If it is due to endocrine disorder, it will also cause menstruation to be affected accordingly, so clinically it is also recommended that once menstrual abnormalities occur, such as abnormal cycles or changes in the timing of menstruation, it is advisable to check the sex hormone six items to understand whether the endocrine secretion is normal, and clinically give the necessary regulation. Drinking black soy milk can only increase the amount of menstruation.