One of the main characteristics of women with endometrial cancer is irregular vaginal bleeding. Especially for postmenopausal women or women who are not menstruating, irregular vaginal bleeding should be taken seriously. The color of bleeding from endometrial cancer is not certain, it can be bright red, and then gradually turn to dark red or even black. Of course, it has a lot to do with the stage of endometrial cancer. The color of blood is not constant and may change with the development of the disease. If postmenopausal women or elderly women suddenly experience irregular vaginal bleeding with dark red color, they should pay attention to it and go to the hospital for relevant examinations to rule out the possibility of endometrial cancer. Endometrial cancer is not only found in postmenopausal women, but also in women of reproductive age. Therefore, vaginal bleeding during non-menstrual period should be taken seriously. Irregular vaginal bleeding indicates that the disease has progressed to a certain level and the cancer cells have damaged the normal tissue cells. Women who have been diagnosed with endometrial cancer should pay close attention to the color of their vaginal bleeding and go to the hospital for systematic treatment when the color of the blood is abnormal.