Choriocarcinoma is a trophoblastic tumor secondary to pregnancy and occurs mostly in women of childbearing age, but also rarely after menopause. The exact cause is unclear. Most of them originate in the uterus, but very few can originate in the fallopian tubes, cervix, broad ligament, etc. The timing of the onset of choriocarcinoma is variable from the time of the previous pregnancy. The majority of choriocarcinomas secondary to glucose develop more than one year later, and those secondary to miscarriage and full-term delivery mostly develop within one year. If there is continuous irregular vaginal bleeding after pregnancy, or irregular vaginal bleeding occurs again after normal menstruation, accompanied by poor recovery of uterus or enlargement of uterus, you should check whether the blood HCG rises, ultrasound to check the condition of uterus, X-ray chest film, CT MRI, and pathological examination to determine whether it is choriocarcinoma, and choose the treatment according to the situation.