Cervical cancer screening was done half a year ago, but now the vaginal bleeding may indicate endometrial-related lesions, pregnancy-related diseases, cervical-related diseases and other diseases. 1. Uterus-related lesions: endometrial polyps, submucosal fibroids, endometrial hyperplasia, endometrial cancer, etc. Gynecological ultrasound can be used for screening, and hysteroscopy and diagnostic curettage can be used to make a clear diagnosis if necessary. 2. Pregnancy-related diseases: ectopic pregnancy, preeclampsia, miscarriage, gestational trophoblastic diseases, etc., which can be differentiated and diagnosed by gynecological ultrasound and human chorionic gonadotropin test. 3. Cervix-related diseases: cervicitis, endometrial polyps, etc., which can be differentially diagnosed by gynecological examination. 4. Others: ovulation bleeding, senile vaginitis, etc. For the occurrence of unexplained vaginal bleeding, it is recommended to consult the hospital as soon as possible to identify the cause of the disease so as not to delay treatment.