The presence of black blood clots in the leukorrhea proves that there is vaginal bleeding. There are many reasons for this, such as inflammatory diseases, cervical lesions, ovulation bleeding, miscarriage or other gynecological oncological diseases, etc., which should be combined with the patient’s other clinical symptoms, signs, and relevant laboratory tests to determine the cause.1. If the patient’s leukorrhea with black clots occurs after coitus, it is important to consider that it may be a case of Contact bleeding, cervical lesions, need to do gynecological internal examination and cervical screening. 2, if the leukorrhea has black blood clots, accompanied by increased leukorrhea, odor, abdominal pain and discomfort, should be considered to be the gynecological inflammatory diseases, need to do gynecological internal examination of the leukorrhea, to determine the site and type of inflammation. 3, if the leukorrhea has black clots occurred in the middle of the two menstruation, consider that it may be ovulation bleeding. The most important thing to remember is that you can’t be sure that you’re getting the right amount of blood.