Retroflexion most commonly refers to a uterus that bends backward on itself at a sharp angle, but the term also describes a specific maneuver doctors perform during colonoscopy. Both uses share the same root meaning: something folding or bending in a reverse direction. About 1 in 5 women has a retroverted or retroflexed uterus, and the endoscopic version is performed in the vast majority of routine colonoscopies. Here’s what each means and why it matters.
Retroflexion of the Uterus
In a typical pelvic anatomy, the uterus tilts forward over the bladder. When the entire uterus tips backward toward the spine, that’s called retroversion. Retroflexion is a step further: the body of the uterus bends sharply backward on the cervix at the point where they meet (called the isthmus), creating a pronounced angle. Think of it like a garden hose with a kink in it. A uterus can be retroverted without being retroflexed, but retroflexion always includes that backward bend at the junction between the cervix and the uterine body.
The position shifts the cervix forward, closer to the bladder and urethra, instead of sitting in the back of the vaginal canal the way it does in the more common forward-tilting position. On ultrasound or pelvic exam, this rearranged anatomy is usually easy to identify. In some cases, particularly when endometriosis is involved, strong adhesions behind the uterus can pull it into a retroflexed position, creating what sonographers call a “pulling sleeve sign” on imaging.
How Common It Is
Roughly 20% of women have a backward-positioned uterus. A large case series published in JAMA found retroposition in 202 out of 1,000 women during routine examination, confirming the long-cited ratio of about 1 in 5. Many of these are congenital, meaning the uterus simply developed in that orientation. Others acquire the position later in life due to conditions like endometriosis, pelvic inflammatory disease, or scar tissue from surgery. Either way, it’s common enough to be considered a normal anatomical variant rather than a disorder.
Symptoms and When It Matters
Many women with a retroflexed uterus never know it and experience no symptoms at all. But research on an unselected group of women found that those with a retroverted uterus reported noticeably higher rates of two specific problems: painful sex (dyspareunia) and severe menstrual cramps (dysmenorrhea). About two-thirds of women with a retroverted uterus in that study experienced painful intercourse, compared to 42% of women with a forward-tilting uterus. Severe period pain followed a similar pattern, affecting 67% versus 43%.
Interestingly, the study found no link between uterine position and other types of pelvic pain, including pain during ovulation, premenstrual discomfort, or general non-cyclical pelvic pain. So the backward position seems to specifically affect intercourse-related and menstrual pain rather than causing widespread pelvic symptoms. Deep penetration during sex tends to be the most uncomfortable because it pushes against the uterus in its tilted position.
Effects on Fertility and Pregnancy
A retroflexed uterus does not reduce your ability to get pregnant. It also doesn’t typically complicate labor or delivery. During pregnancy, the uterus naturally shifts forward as it grows to accommodate the fetus, regardless of its starting position.
The one rare exception is uterine incarceration, which happens when the retroverted uterus fails to shift forward during pregnancy and becomes trapped in the pelvis. This is uncommon, but it can restrict fetal growth and cause complications if not addressed. Providers monitor for this during routine prenatal care.
Treatment for a Retroflexed Uterus
If a retroflexed uterus isn’t causing symptoms, no treatment is needed. For women who do experience pain, there are a few options. A vaginal pessary, a removable device inserted into the vagina, can physically reposition the uterus into a more forward-facing angle, relieving pressure on surrounding structures. Pessaries are also used when a retroverted uterus complicates other procedures, such as certain types of fibroid treatment, by holding the uterus in a favorable position.
When the retroflexion is caused by adhesions from endometriosis or prior surgery, treating the underlying condition may resolve the positioning issue. Laparoscopic surgery can break up scar tissue and, in some cases, surgically reposition the uterus. These interventions are reserved for cases where symptoms significantly affect quality of life.
Retroflexion During Colonoscopy
The same word describes something completely different in gastroenterology. During a colonoscopy, retroflexion is a maneuver where the doctor bends the tip of the scope into a tight U-turn inside the rectum, pointing the camera backward. This lets them see parts of the rectal lining that face the wrong direction to be viewed on the way in or out with normal forward viewing.
The maneuver is successful in about 94% of patients. In the remaining cases, the rectum is too narrow to safely make the turn. Experts have long endorsed it as an essential component of a thorough colonoscopy, specifically to catch polyps hiding on the underside of rectal folds. In one study of over 1,400 patients, retroflexion found 7 polyps that were invisible on careful forward viewing alone, though only one of those was an adenoma (the type with precancerous potential), and it was small at 4 millimeters.
The practical takeaway from the research is that retroflexion adds relatively little to polyp detection when the forward exam has already been done carefully. But the risk is also very low: rectal perforation from the retroflexion maneuver occurs in roughly 0.01% of cases, or about 1 in 10,000 colonoscopies. Because of this low risk and modest benefit, performing the maneuver is generally left to the endoscopist’s judgment rather than being strictly required in every case.