Women with coffee-colored fluid flowing from the bottom is actually abnormal vaginal bleeding. There are several reasons for abnormal vaginal bleeding: First, pregnancy: If you are a woman of childbearing age, you should first rule out the possibility of pregnancy. Pregnancy and miscarriage or ectopic pregnancy may cause abnormal vaginal bleeding, and a pregnancy test must be done. Second, uterine bleeding: If you are not pregnant, abnormal vaginal bleeding like coffee-colored liquid may be from the uterine cavity, which is considered to be caused by menstrual disorders, and endometritis, endometrial polyps, uterine fibroids, adenomyoma may cause abnormal vaginal bleeding, even endometrial cancer, all of which need to be identified. Thirdly, cervical bleeding: abnormal vaginal bleeding, like coffee-colored liquid, may come from the cervix, cervical polyps, highly squamous epithelial lesions of the cervix or even early cervical cancer, which may also cause abnormal vaginal bleeding.