Black menstrual blood and low volume during menstruation may be caused by uterine cold. Women with uterine cold often suffer from menstrual pain, black color, low volume of menstrual blood, and coldness in the lower abdomen. It is recommended to drink brown sugar water and motherwort granules during menstruation to effectively relieve the black color and low volume of menstrual blood. During menstruation, women with uterine cold are advised to keep their abdomen warm and avoid getting cold in the abdomen to avoid aggravating the black menstrual blood. It is recommended to eat a light diet, avoiding cold food, cold fruits and food just taken out of the refrigerator. When using air conditioners or fans in summer, you should pay attention to keeping your abdomen warm so as not to aggravate the coldness in your abdomen. If the coldness in the uterus is more serious, heavy menstrual cramps, significantly reduced menstrual volume and dark color, it is recommended to consider the regulation of coldness in the uterus through traditional Chinese medicine.