When there is blood below the stomach pain, the first thing to look at in this case is whether there is bleeding first or stomach pain first. If there is bleeding first, the first thing to rule out is whether there is any organic lesion in the uterus, because vaginal bleeding usually comes out from inside the uterine cavity, and if there are endometrial polyps or fibroids, it can cause bleeding down there. The pain in the stomach after bleeding is due to inflammation caused by bacterial upstream infection after bleeding for a long time. If there is stomach pain first and then bleeding, inflammation of the pelvic cavity is first suspected because inflammation of the uterus or inflammation of the fallopian tubes and ovaries is first suspected in this case. Since with inflammation, the endometrium can also lead to inflammation, which may produce inflammatory bleeding. Therefore, in the event of stomach pain and bleeding down there, the first thing to do is to go to the hospital for an ultrasound to see if there are any organic lesions and inflammation in the uterus.