Vaginal ultrasound refers to transvaginal ultrasound. Vaginal ultrasound is better than abdominal ultrasound for ovarian examination. Vaginal ultrasound is a method of ultrasound diagnosis in which the ultrasound probe is placed into the vagina. Compared with abdominal ultrasound, vaginal ultrasound has clearer images and can more accurately diagnose the presence of polycystic ovaries, follicular development, and cysts and other malignant tumors of the ovaries. Vaginal ultrasound is only suitable for women who have sex, do not have sex before the vaginal ultrasound, need to empty the bladder, and during menstruation can not be performed vaginal ultrasound. In addition, you need to go to a regular medical institution for the examination, during which you must pay attention to personal hygiene, but also to keep the vulva dry and fresh, wear cotton underwear, avoid wearing tight clothes.