When bright red blood appears in the vagina during intercourse, the patient must undergo a gynecological examination. The gynecological examination can initially determine whether the blood comes from the cervix, vagina or from the uterine cavity. If the blood comes from the uterine cavity, gynecological internal examination is needed to observe whether there is any pressure and pain in the uterus, and gynecological ultrasound is also needed to observe whether there is any organic lesion in the uterus and whether there is any abnormal thickening of the uterine lining to find out the cause of the bleeding in the uterine cavity. If the bleeding is from the cervix, it is necessary to do cervical cancer screening, cervical cancer screening programs mainly include TCT and HPV, after ruling out cervical lesions, mainly consider cervical inflammatory diseases, cervical polyp diseases and other causes. If the bleeding is from the vaginal wall, it is important to observe the vaginal wall for color changes and abnormal growths. Cancer screening is also performed, mainly screening for human papillomavirus, to observe the presence of non-papillomavirus infection, and the results are used to determine the next step in testing and treatment.