Low menstrual flow, darkness and blood clots may be caused by a small amount of menstrual blood accumulating in the vagina and flowing out over time. If the menstrual cycle is irregular, low volume with blood clots, pain in the abdomen, breast swelling, irritability, etc., this is considered to be related to Qi stagnation and blood stasis. If the menstrual flow is low, dizziness, pallor, and weakness, it may be related to Qi and Blood deficiency. If the menstrual cycle is irregular, low in volume, severe abdominal pain, warmth and coldness, this may be related to uterine cold. If there is an intrauterine device (IUD), it may cause low menstrual flow, dark color, and dripping bleeding because of the side effects of the device or its position downward. Some patients with vaginitis or endometritis may also experience low menstrual flow, dark color, and blood clots.