It is normal to have a small amount of blood clots during menstruation. It is the shedding of endometrial tissue and menstrual blood mixed together to form larger clots, which are discharged black after accumulating in the uterine cavity, but to have a large amount of black blood clots is an abnormal phenomenon, which may be related to progesterone deficiency. Usually, it can be manifested as cold hands and feet, cold abdomen, irritability, irritability, dizziness, head swelling, insomnia, etc. It can be accompanied by dysmenorrhea. Insufficient yang energy in the body is stimulated by cold, such as cold or eating cold food that causes stagnation of qi and blood, resulting in black blood clots i.e. cold clotting and blood stasis or high mood swings, high psychological stress, always depressed and not allowed to open up resulting in stagnation of qi and blood, resulting in black blood clots i.e. qi stagnation and blood stasis. When suffering from gynecological inflammation such as pelvic inflammatory disease, endometritis, tubal adhesions, etc., resulting in menstrual blood not being discharged smoothly, black blood clots may also appear. You can drink brown sugar and ginger water and take oral medications to promote blood circulation and eliminate blood stasis, such as motherwort pellets and blood stasis capsules, to help the black blood clots to be discharged.