Vaginal bleeding is a common symptom of diseases of the female reproductive organs. Blood flows from the vagina, but the bleeding site may be in the vulva, vagina, cervix or uterus (the latter being more common); the amount of bleeding varies (from a small amount in drops to a large amount that can be life-threatening); and the bleeding varies (it may be manifested as menstrual disorders, irregular bleeding or contact bleeding that occurs after sexual intercourse, after gynecological examination, etc.). Vaginal bleeding can certainly be life-threatening, but if it is caused by benign diseases, the prognosis is good; while a small amount of bleeding may be the earliest symptom of malignant tumors, which may delay treatment and cause adverse consequences if ignored.