An anteverted and retroflexed uterus means the uterus as a whole tilts forward toward the bladder, but the upper portion of the uterine body bends backward on itself, toward the spine. It sounds contradictory because two separate anatomical angles are being described at once, and they happen to point in opposite directions. This combination is a recognized variant of normal pelvic anatomy, and in many cases it causes no symptoms at all, though it does show up more often in people who have had a cesarean delivery.
Two Angles, Not One
Ultrasound reports describe uterine position using two measurements taken in the same plane. The first is “version,” which refers to the angle where the cervix meets the vaginal canal. If the cervix tips the whole uterus forward, that is anteversion; if it tips it backward, that is retroversion. The second measurement is “flexion,” which describes how the body of the uterus bends relative to the cervix. If the body folds forward over the cervix, that is anteflexion; if the body folds backward away from the cervix, that is retroflexion.1PubMed. Flexion and version of the uterus on pelvic ultrasound examination
Most textbooks describe the “typical” uterus as both anteverted and anteflexed, meaning the whole organ tilts forward and the body also bends forward. But these two angles can combine in several ways. One study categorized uterine positions into seven distinct configurations, including anteverted and retroflexed, retroverted and anteflexed, and axial (straight in line with the vagina).2PubMed. Anteverted retroflexed uterus: a common consequence of cesarean delivery So when your ultrasound says “anteverted, retroflexed,” it is telling you that the base of the uterus sits in its expected forward-leaning spot, but the upper body curves in the opposite direction from what the textbooks show as standard.
Why This Combination Happens
Variations in how the body bends on the cervix can be present from birth or develop over time. The uterus is not bolted in place. It is held loosely by ligaments and supported by surrounding muscles, and its position shifts with bladder and bowel fullness, body position, and life events like pregnancy. In some people the retroflexed shape is simply how the uterus has always sat. In others, adhesions from surgery, infection, or conditions like endometriosis can pull or fix the body into an unusual angle.3Anaesthesia & Intensive Care Medicine. Anatomy of the uterus
One scenario that researchers have linked specifically to the anteverted-retroflexed combination is prior cesarean delivery. A study published in the American Journal of Roentgenology examined uterine shape on imaging and found that this particular compound position showed up as a common consequence of cesarean sections.2PubMed. Anteverted retroflexed uterus: a common consequence of cesarean delivery The scar tissue at the lower uterine segment may tether the lower portion forward while allowing the upper fundus to tip backward. If you have had a cesarean and then see this description on a later ultrasound, the surgery is the likeliest explanation.
How Common Are Non-Standard Uterine Positions
Exact numbers for the anteverted-retroflexed combination alone are not well tracked in large population studies, but data on retroversion and retroflexion more broadly give useful context. Roughly one in six women has a retroverted uterus, and that proportion climbs in people being seen for pelvic floor problems.4PubMed Central. The Retroverted Uterus and Pelvic Floor Dysfunction: 400 BC to 2025 AD In a general gynecology clinic population, about one in five uteri were retroverted, while in a urogynecology clinic (where patients already have pelvic floor symptoms) the figure rose to about one in three.5PubMed. The retroverted uterus: ignored to date but core to prolapse
These figures cover retroversion broadly. Compound positions like anteverted-retroflexed are a subset. Still, the point is that the uterus sitting in something other than the “textbook” position is extremely common and, in most cases, perfectly benign.
Does It Cause Pain
One of the first questions people have when they see an unusual-sounding finding on an ultrasound is whether it explains symptoms they have been living with. There is some evidence linking non-standard uterine positions with pelvic pain, though the picture is far from straightforward. A study of an unselected population of women found that those with a retroverted uterus reported painful intercourse at a higher rate (about two-thirds, compared with roughly four in ten of those with anteverted uteri) and were also more likely to report severe period pain.6PubMed. Mobile uterine retroversion is associated with dyspareunia and dysmenorrhea in an unselected population of women
It is worth noting that this study looked at retroversion in general, not specifically at anteverted-retroflexed uteri. But the backward bend of the uterine body (retroflexion) shares the mechanical logic: when the upper uterus curves toward the back of the pelvis, it can sit closer to structures like the rectum and the uterosacral ligaments, areas that are sensitive to pressure. Deep penetration during sex may push against the uterine fundus more directly in these positions, which some people feel as a deep ache. If you have this position and notice pain primarily during deep intercourse or at certain times in your menstrual cycle, the uterine shape may be contributing, but it is not guaranteed to be the whole story.
Separately, researchers have investigated whether the actual angle of flexion matters for menstrual pain. A study used ultrasound to measure the angle between the cervix and the uterine body and looked for a link with pain severity. The idea was that a sharper bend might obstruct menstrual flow, increasing cramping.7PubMed. Intensity of menstrual pain and estimated angle of uterine flexion This remains a plausible mechanism, but the clinical evidence is mixed enough that no one treats uterine position alone as a definitive cause of dysmenorrhea.
Fertility and Getting Pregnant
An unusual uterine position does not prevent pregnancy. That is the headline. The uterus being anteverted and retroflexed does not block sperm from reaching an egg, and it does not stop a fertilized embryo from implanting. However, one recent study found that patients with retroverted uteri were about twice as likely to have conceived through IVF compared to those with anteverted uteri, even though the medical reasons for needing IVF were similar between the two groups.8PubMed. The impact of uterine position on conception modes and perinatal outcomes in nulliparous patients
That does not mean a retroverted or retroflexed uterus causes infertility. It may mean that some of the same underlying conditions that tip or fix the uterus into a non-standard position, such as adhesions or endometriosis, also happen to make conception harder. Disentangling the position from the pathology behind it is tricky. The practical takeaway: if you are trying to conceive and your ultrasound shows this combination, the position itself is unlikely to be the barrier, but it may be worth discussing with your doctor whether anything else (adhesions, endometriosis) is influencing both the shape and your fertility.
Endometriosis and Fixed Retroflexion
One distinction clinicians pay close attention to is whether the uterine position is mobile or fixed. If a doctor can gently shift the uterus during an exam and it moves freely, the position is considered a normal variant. If the uterus is stuck, or “fixed,” that raises suspicion for adhesions, often caused by endometriosis or prior surgery.
A study validating ultrasound criteria for deep endometriosis found that a fixed retroflexed uterus was associated with roughly double the odds of bowel involvement and about two and a half times the odds of uterine serosal involvement by endometriosis.9European Journal of Radiology. Transvaginal ultrasound for deep endometriosis: Prospective validation of SRU criteria and diagnostic value of indirect signs The key word there is “fixed.” A freely mobile retroflexed uterus does not carry the same signal. If your ultrasound report mentions that the position is fixed or that there is limited mobility, that is worth flagging with your provider. If the report says nothing about fixation, the position alone is not a red flag for endometriosis.
What It Means for Pregnancy
In the vast majority of pregnancies, a retroverted or retroflexed uterus straightens itself out by the end of the first trimester as the growing uterus rises out of the pelvis. You generally do not need any intervention to make this happen.
In rare cases, the uterus fails to rise and becomes trapped in the pelvis, a condition called an incarcerated gravid uterus. This typically comes to attention around 14 to 17 weeks of pregnancy, and symptoms can include difficulty urinating, constipation, rectal pressure, and lower abdominal pain.10PubMed Central. Incarcerated gravid uterus: A rare but potentially devastating obstetric complication A retroverted uterus in the first trimester is one of several risk factors, alongside things like adhesions, fibroids, and a deep pelvic shape.11Obstetrical & Gynecological Survey. Incarceration of the Gravid Uterus
Incarceration is genuinely serious when it happens, because the trapped uterus can compress the urethra and bowel, but it is also genuinely rare. If you have a retroflexed uterus and become pregnant, your provider will monitor things, but there is no reason to expect trouble. The overwhelming norm is that the uterus corrects its position on its own as the pregnancy progresses.
IUD Insertion and Contraception
Another common worry is whether a non-standard uterine position makes IUD placement harder or less effective. Research on this goes back decades and has been reassuring. A study comparing IUD performance across different uterine positions found that insertion complications were rare regardless of position, and people with retroverted uteri did not have higher rates of accidental pregnancy, expulsion, or removal for pain and bleeding over twelve months of use.12PubMed. Do retroverted uteri adversely affect insertions and performance of IUDs?
What does matter is that the clinician performing the insertion knows your uterine position beforehand. The instrument used to measure the uterine cavity (a uterine sound) needs to follow the curve of the canal rather than push against the wall, and knowing whether the body bends forward or backward helps the clinician angle it correctly. An experienced provider will feel the direction during the procedure and adjust. If your uterus is anteverted and retroflexed, the lower segment will angle forward while the upper body curves back, so the sound path has a slight S-curve. Mentioning the ultrasound finding at your IUD appointment can be helpful, but it should not deter you from getting one.
Imaging Challenges and Workarounds
One genuinely practical consequence of an atypical uterine position is that it can make certain ultrasound views trickier. Standard transvaginal ultrasound works best when the uterus is anteverted and anteflexed, because the probe sits right beneath the organ. When the body of the uterus bends away from the probe, as in retroflexion, the endometrial lining (which doctors often want to measure for screening or fertility purposes) can be harder to visualize clearly.13PubMed Central. Uterine Position and Diagnostic Accuracy of Transvaginal 2D, 3D, Transrectal and Transabdominal Ultrasonography in the Assessment of Endometrial and Uterine Cavity Abnormalities-A Narrative Review
This does not mean your ultrasounds are unreliable. It means the sonographer may need to spend more time angling the probe or applying gentle pressure to get optimal images. In some situations, a transabdominal approach (the external ultrasound on the belly) or even a 3D ultrasound can supplement what transvaginal scanning misses. If you have a history of suboptimal imaging and your uterine position is a known factor, it is reasonable to ask whether a different scanning approach might give clearer results.
When Treatment Is Actually Needed
In most cases, the answer is never. An anteverted and retroflexed uterus that is mobile and not causing symptoms does not require correction. Historically, doctors were much more aggressive about “fixing” uterine positions. Pessaries (devices inserted into the vagina to push the uterus into a different orientation) were once a standard intervention. In one large study of over 1,400 patients with retroverted uteri, pessary use led to lasting improvement in only about a third of cases, and surgery was reserved for people where conservative approaches failed and symptoms persisted.14PubMed Central. An analytical study of 1,450 cases of retroverted uterus with special reference to treatment
Modern practice has moved firmly away from treating position alone. The current consensus is that uterine position is a normal anatomical variable, not a disease. Treatment is directed at symptoms or at the underlying condition causing those symptoms. If you have painful intercourse, the approach might include positional changes during sex, pelvic floor physical therapy, or investigation for endometriosis. If you have heavy or painful periods, those get managed on their own terms. The shape on the ultrasound is context, not a diagnosis.
Positions Can Change Over Time
One detail that surprises many people is that the uterine position reported on one ultrasound may not match the next. Because the uterus is a muscular organ suspended by flexible ligaments, its angle can shift with bladder fullness, bowel distension, body position during the scan, and hormonal changes across the menstrual cycle. A uterus that appears anteverted and retroflexed on one visit might look simply anteverted on another, especially if the retroflexion is mild.
This variability is also why clinicians distinguish between mobile and fixed positions. A uterus that changes between exams is mobile by definition and very unlikely to be a concern. A uterus that consistently shows the same retroflexed position across multiple scans, especially if the sonographer notes limited mobility or tenderness when pressing on it, is worth investigating further for adhesions or endometriosis. If you are anxious about the finding, knowing whether it stays the same over time gives you and your doctor more useful information than a single snapshot.
What to Tell Your Doctor
If you have just seen “anteverted, retroflexed” on an ultrasound report and it caught your eye, the most productive conversation with your doctor starts with a few specific questions rather than general worry about the finding itself. Ask whether the position appeared mobile or fixed. Ask whether it affected the quality of the images obtained during the scan. And if you have any symptoms you have been attributing to something else, like deep pain during sex, persistent cramping, or difficulty with tampon or menstrual cup positioning, mention them. These may be related, or they may not, but connecting the dots is easier when your provider knows about both the imaging and the lived experience.
It can also be worth asking whether the finding is new or was present on prior imaging. If you had an ultrasound years ago that showed a straightforward anteverted, anteflexed uterus and now the shape has changed, a life event like pregnancy, cesarean delivery, or pelvic surgery is the most common explanation. That history helps your clinician decide whether the current position is worth any follow-up at all, and in the majority of cases, the answer will be that it is simply how your uterus sits now, nothing more.