First, vaginal ultrasound is prohibited when the patient has acute vaginal inflammation, cervical inflammation or heavy vaginal bleeding. First, when the patient has acute vaginal inflammation, cervical inflammation or heavy vaginal bleeding, vaginal ultrasound is contraindicated because acute vaginal and cervical inflammation can easily lead to local congestion and edema. If there is a lot of bleeding in the vagina, the cervical opening is relatively loose and the blood is the best petri dish for bacteria. Vaginal ultrasound examination at this time can easily lead to upstream infection. Second, vaginal ultrasound should be used with caution when the patient is pregnant, unless the patient is not sure whether the pregnancy is intrauterine or extrauterine, or if there is a suspicion of ectopic pregnancy, vaginal ultrasound can be performed.