The position of the uterus can be categorized as anterior, median, or posterior based on the relative position of the uterine body in relation to the longitudinal axis of the body. The most common position of the uterus is anterior. When the uterus is in anterior position, the cervix is positioned posteriorly, and when lying on the back, the lowest point of the vagina is the posterior fornix, where semen will accumulate, and the cervical opening is positioned posteriorly to facilitate the entry of sperm into the uterine cavity. Some women are born with a posterior uterus. The cervix of the posterior uterus is relatively anterior, and it may be more difficult for sperm to enter the uterine cavity than the anterior uterus. However, during ovulation, the secretion of cervical mucus reaches a peak, and the degree of pulling can be up to 10cm, which can help sperm to swim into the cervix and the uterine cavity. Therefore, if there is no combination of other gynecological diseases, there is normal ovulation, the fallopian tubes are smooth, and the endometrium is normal, the simple posterior uterus will not have too much impact on conception, not to mention that it will not lead to infertility. However, in some patients, the posterior uterus is not congenital, but is caused by certain diseases, such as endometriosis, pelvic inflammatory diseases, etc., which can cause serious adhesions in the pelvis, so that the uterus is pulled to cause positional displacement. At this time, the cause of infertility is mostly due to pelvic inflammation and adhesion leading to ovulation obstruction, tubal impassability, as well as endometritis leading to a decrease in the tolerance of the endometrium, and the uterine position shift is only one of the clinical manifestations, rather than the underlying cause of infertility. Therefore, a simple posterior uterus does not need to worry about affecting pregnancy, but if you have been preparing for pregnancy for more than 1 year and still not pregnant, you need to consult a fertility center to check whether there are other factors affecting pregnancy. Another type of uterine position abnormality is uterine prolapse, which refers to the downward displacement of the uterus along the vagina and can be classified into degrees I, II and III according to the degree of prolapse. However, uterine prolapse is most common in women who have multiple birth injuries, malnutrition and excessive physical labor, and congenital uterine prolapse is rare. Uterine prolapse directly affects women’s quality of life and should be actively treated regardless of whether they have reproductive requirements.