The normal position of the uterus is tilted forward toward the bladder, a position called “anteverted and anteflexed.” Roughly 80% of women have a uterus that angles forward over the vagina, and about 50% have both the forward tilt and a forward bend of the uterine body over the cervix. The remaining 16 to 20% have a uterus that tilts backward toward the spine, which is a common variation rather than a disorder.
What Anteverted and Anteflexed Mean
Uterine position is described using two separate angles. The first is the angle between the uterus and the vagina. When the uterus tips forward relative to the vagina, that’s called anteversion. The second angle is the bend between the body of the uterus and the cervix (the lower neck of the uterus). When the body folds forward over the cervix, that’s anteflexion. In most women, the long axis of the cervix doesn’t line up straight with the body of the uterus; instead, the body tips forward, creating a slight bend.
These two angles work together. A uterus can be anteverted (tilted forward) without being strongly anteflexed, or it can have both features. The “textbook normal” is both anteverted and anteflexed, but there’s a wide range of what counts as typical, and the uterus can shift position slightly depending on how full the bladder or rectum is.
What Holds the Uterus in Place
The uterus doesn’t float freely in the pelvis. A network of ligaments and muscles anchors it. The two most important support structures are the cardinal ligaments and the uterosacral ligaments. The cardinal ligaments extend from the sides of the cervix and upper vagina to the pelvic walls, acting like lateral guy-wires. The uterosacral ligaments attach the back of the cervix to the front of the sacrum (the bone at the base of the spine), providing rear support. Together, these ligaments hold the uterus and upper vagina in position over the pelvic floor muscles.
The pelvic floor itself, a broad sheet of muscle called the levator ani, acts as a platform that the uterus rests above. Weakness in either the ligaments or the pelvic floor muscles can allow the uterus to shift position or, in more significant cases, descend lower in the pelvis.
The Retroverted Uterus
About 16 to 18% of women, roughly 1 in 6, have a retroverted uterus, meaning it tilts backward toward the spine instead of forward toward the bladder. Some sources round this up to 1 in 5. A retroverted uterus can also be retroflexed, where the body of the uterus bends backward over the cervix.
For most people, a retroverted uterus is simply the shape they were born with. It causes no symptoms and requires no treatment. Many women don’t know they have one until it’s discovered during a routine pelvic exam or ultrasound. In some cases, though, a uterus that was previously anteverted can shift to a retroverted position later in life. This acquired retroversion can result from conditions like endometriosis, pelvic inflammatory disease, or fibroids, which create scar tissue or adhesions that pull the uterus backward. In these situations, any symptoms are usually caused by the underlying condition rather than the position itself.
How Uterine Position Is Diagnosed
Uterine position is most commonly identified through ultrasound, which is typically the first imaging tool used to evaluate the uterus. A transvaginal ultrasound, where a small probe is inserted into the vagina, gives a clear view of the cervix, the uterine lining, and the muscular wall, and can show the angle of the uterus relative to the cervix and vagina. MRI provides even more detailed images when needed, but ultrasound is sufficient for most assessments. A standard pelvic exam can also reveal uterine position through touch.
Does Uterine Position Affect Fertility?
A retroverted uterus does not prevent pregnancy. However, a 2024 study comparing nulliparous patients (those who hadn’t given birth before) found that women with retroverted uteri had a higher rate of conceiving through IVF compared to those with anteverted uteri (12.3% vs. 6.8%), suggesting that retroversion may make natural conception slightly more difficult for some. Importantly, once pregnancy was achieved, uterine position did not significantly affect pregnancy complications or the likelihood of vaginal delivery.
The reason retroversion might create a minor barrier to conception isn’t entirely settled, but the altered angle may affect how easily sperm reach the fallopian tubes or how an embryo implants. For the vast majority of women with a retroverted uterus, this difference is not clinically meaningful.
Retroverted Uterus During Pregnancy
About 15% of pregnant women have a retroverted uterus in the first trimester. As the uterus grows, it almost always tips forward on its own before 14 weeks of gestation. This self-correction happens naturally as the expanding uterus rises out of the pelvis.
In rare cases, the uterus stays retroverted past 16 weeks, a condition called uterine incarceration. This occurs in approximately 1 in 3,000 pregnancies. When the growing uterus remains trapped in the pelvis rather than rising into the abdomen, it can cause pelvic discomfort, difficulty urinating, and gastrointestinal symptoms, though some women have no symptoms at all. A key clinical clue is that the cervix becomes difficult to feel or visualize during a vaginal exam. MRI or ultrasound can confirm the diagnosis.
Even among incarcerated cases, about 78.5% resolve spontaneously without intervention. Only about 1 in 2,300 deliveries involves an incarcerated uterus that persists to term or near term without manual correction.
When Position Changes Over Time
Uterine position isn’t necessarily fixed for life. Pregnancy and childbirth can stretch the supporting ligaments enough to change the angle permanently. Aging and menopause reduce the strength of pelvic floor muscles, which can also shift position. Conditions that cause scarring in the pelvis, such as repeated infections or endometriosis, may pull the uterus into a different orientation. The prevalence of retroversion increases among women with pelvic floor dysfunction, reinforcing that weakened support structures play a role in positional changes.
None of these shifts are inherently dangerous. The uterus functions the same way regardless of its tilt. Menstruation, conception, and pregnancy can all proceed normally in an anteverted, retroverted, or mid-position uterus. The main clinical relevance of knowing your uterine position is that it helps explain certain symptoms, like deep pain during intercourse in specific positions, and it gives your provider useful context during imaging and procedures.