Sudden redness on the 40th day after menopause can be caused by pre-eclampsia, ectopic pregnancy, scarred pregnancy, etc. It is recommended to consult the hospital in time and complete the relevant examinations. The sudden appearance of vaginal bleeding on the 40th day after menopause, it is recommended to consult the hospital in time, complete the ultrasound, human chorionic gonadotropin, progesterone examination, to rule out ectopic pregnancy, if ectopic pregnancy, according to the situation, can choose conservative treatment or surgical treatment. If the pregnancy is intrauterine, we need to know the development of the embryo, whether it is preeclampsia or embryonic arrest. If there is a history of cesarean section, it is recommended to improve the vaginal ultrasound to know the distance from the gestational sac to the scar. If there is a history of cesarean section, it is recommended to improve the vaginal ultrasound to know the distance between the gestational sac and the scar. If it is a pre-eclampsia, it can be treated with fertility preservation; if it is an ectopic pregnancy, it is recommended to timely gynecological treatment; if the ultrasound suggests that the distance between the gestational sac and the scar is less than 2cm, it is recommended to terminate the pregnancy, and if it is an embryonic stagnation, the pregnancy should be terminated. After completing the relevant examinations, it is recommended to consult a professional physician and decide the next step under the guidance of an obstetrician.