The vagina is connected to the uterus, and the outer opening of the anterior wall of the vagina to the opening of the cervical canal of the uterus is about 7~9cm. The uterus is an inverted pear shape that is slightly flattened anteriorly and posteriorly, and the lower part of the uterus is the cervix, which is narrower and cylindrical. The vagina is a wide upper and narrow lower tube located in the center of the lower part of the true pelvis, and the upper end of the vagina wraps around the vaginal part of the cervix. A circumferential crypt exists between the cervix and the vagina, called the vaginal vault. The anterior wall of the vagina is about 7~9cm and the posterior wall is about 10~12cm. the distance from the anterior wall of the external opening of the vagina to the cervix is roughly 7~9cm. the vagina is the same as the uterus, and vaginal inflammation can spread upwards to cause pelvic inflammation. If there is any discomfort, it is recommended to seek medical attention promptly.