Do Uterine Polyps Bleed? Why It Happens & What to Do

Uterine polyps (also called endometrial polyps) can and often do bleed, though not every polyp causes noticeable symptoms. Abnormal bleeding during periods, between periods, or after menopause is the most common reason polyps get detected in the first place. The relationship between polyps and bleeding involves overgrown blood vessels inside the growths themselves, and the practical question for most people is whether that bleeding signals something serious or something manageable. For the majority, it lands on the manageable side, but certain factors shift the picture.

How Common Is Bleeding From Uterine Polyps

Endometrial polyps are finger-like tissue growths that project from the inner lining of the uterus. They range from a few millimeters to several centimeters and can appear alone or in clusters. Many are found incidentally during ultrasounds or fertility workups, meaning the person had no idea a polyp was there. But when polyps do announce themselves, bleeding is the calling card. Heavy menstrual periods, bleeding between periods, irregular spotting, and postmenopausal bleeding are all associated with these growths.¹

The tricky part is that not all polyps cause symptoms. A substantial number are “silent” and discovered only because imaging was done for an unrelated reason. One study following women with known polyps found that about a quarter of polyps under 2 cm in younger, premenopausal women actually regressed on their own without treatment.² So the mere presence of a polyp does not guarantee you will bleed. But when unexplained uterine bleeding does occur, polyps are one of the more frequent culprits.

Why Polyps Bleed in the First Place

Polyps are not simply lumps of tissue sitting passively inside the uterus. They are metabolically active growths with their own blood supply, and that blood supply tends to be fragile. Research shows that polyp tissue produces significantly higher levels of vascular endothelial growth factor (VEGF), a protein that stimulates the formation of new blood vessels, compared to the normal endometrial lining right next to it.³ Think of it as a growth that builds itself an extra-dense network of small, thin-walled vessels. Those vessels are more prone to breaking and bleeding, especially during menstruation when the uterine lining sheds.

Polyps also tend to be sensitive to hormonal shifts. Estrogen in particular appears to drive their growth, which is why they are more common around perimenopause, in people with obesity (fat tissue produces estrogen), and in those taking tamoxifen for breast cancer. The same hormonal responsiveness means the surface of a polyp can break down unevenly compared to surrounding tissue, leading to irregular spotting between periods or prolonged bleeding during them.

There is also a mechanical factor. Polyps that dangle from a stalk (pedunculated polyps) can twist, which cuts off their own blood supply temporarily and causes tissue death at the tip. When blood flow returns, bleeding follows. One study found that pedunculated polyps were closely associated with abnormal uterine bleeding compared to broad-based ones.⁴

How Polyps Are Found and Diagnosed

If you go to a doctor with abnormal bleeding, the workup typically starts with a transvaginal ultrasound. This is a reasonable first step, but standard ultrasound is not great at catching polyps on its own. A meta-analysis comparing diagnostic methods found that transvaginal ultrasound detected polyps with a sensitivity of about 62% and specificity of 73%, meaning it misses a fair number of them.⁵ An earlier study put ultrasound’s sensitivity even lower, at roughly half.⁶

A more accurate alternative is saline infusion sonohysterography, where sterile saline is injected into the uterus during the ultrasound to expand the cavity and outline any growths. This bumps the sensitivity up to around 87%.⁵ The gold standard, though, is hysteroscopy, where a thin camera is passed through the cervix so the doctor can look directly at the uterine lining. That achieves a sensitivity of about 92%.⁵

Seeing a polyp on a camera is one thing; confirming what it actually is requires tissue. A biopsy during hysteroscopy is more reliable than a blind biopsy, because blind sampling often misses the polyp entirely or grabs insufficient tissue.⁷ This matters because what looks like a harmless polyp occasionally turns out to be something else, including, rarely, a precancer or cancer.

When Bleeding From a Polyp Deserves Extra Attention

Most endometrial polyps are benign, but a small percentage harbor precancerous or cancerous cells. A systematic review and meta-analysis pooling data from many studies found that the overall malignancy rate in endometrial polyps was about 5% in symptomatic patients (those with bleeding) compared to roughly 2% in those without symptoms.⁸ For premenopausal women, the rate was lower, around 1%, while for postmenopausal women it climbed to about 5%.⁸

Those numbers are small, but certain combinations of risk factors raise them substantially. A Korean study found that menopause, abnormal uterine bleeding, obesity, having multiple polyps, and never having been pregnant were all independently associated with higher odds of a polyp harboring malignancy.⁹ Hypertension and unopposed estrogen therapy have also been flagged as risk factors for malignant transformation.¹⁰

Polyp size matters too. One study found that polyps 2.25 cm or larger carried substantially higher odds of containing malignant cells.¹¹ This is one reason clinicians often lean toward removing larger polyps rather than watching them, even if the person is not experiencing symptoms.

A separate study looking specifically at postmenopausal women with bleeding found cancer or atypical hyperplasia in about 4% of cases, compared to 2% in postmenopausal women without bleeding.¹² The bottom line is that postmenopausal bleeding with a polyp is a scenario that warrants tissue sampling rather than watchful waiting.

What to Do About a Bleeding Polyp

Treatment decisions depend on your age, symptoms, menopausal status, polyp size, and whether you are trying to conceive. For a small, asymptomatic polyp in a premenopausal woman, observation can be reasonable. As mentioned earlier, about 23% of polyps spontaneously regressed in a study that re-evaluated patients surgically, with younger age and smaller polyp size predicting regression. Every postmenopausal woman in that same study, however, had persistent polyps at follow-up.² That observation alone tells you the management approach shifts considerably once menopause has occurred.

When removal is recommended, hysteroscopic polypectomy is the standard approach. The surgeon passes a hysteroscope through the cervix and removes the polyp under direct visualization. The procedure has a high success rate and a low rate of complications.¹³ In many cases, it can be done in an office setting without general anesthesia. One prospective study found a 100% success rate for in-office hysteroscopic morcellation (a method that shaves the polyp away), with an average procedure time of about seven minutes and minimal pain scores reported by patients.¹⁴ Adverse events in that study occurred in only about 2% of patients and were limited to brief fainting-type reactions. Pain was higher in women who had never given birth but still within tolerable levels.¹⁴

When comparing office-based treatment with traditional inpatient polypectomy under anesthesia, a study of nearly 400 women found no difference in how well the two settings resolved abnormal uterine bleeding or in disease-specific quality of life afterward. For many patients, the convenience and lower cost of in-office removal make it the preferred route, assuming the clinical setup and polyp characteristics allow it.

The removed tissue is always sent for pathological examination. Occasionally, what appeared to be a straightforward polyp turns out to be something more concerning on microscopy, reinforcing the diagnostic value of removal even when the primary goal is symptom relief.¹⁵

Polyps, Fertility, and Pregnancy

If you are trying to get pregnant and a polyp is found, the evidence strongly favors removing it. Polyps can interfere with embryo implantation by physically blocking the area where an embryo would attach, by creating a chronic inflammatory environment inside the uterus, or by disrupting hormonal signaling in the endometrial lining. A Cochrane review found that removing polyps before intrauterine insemination roughly doubled the clinical pregnancy rate: about 63% of women achieved a clinical pregnancy after removal compared to 28% without it.¹⁶

This benefit appears to hold regardless of how many polyps you have or their size.¹⁷ In the context of IVF, the method of removal also seems to matter. A retrospective study comparing hysteroscopic polypectomy to conventional curettage (scraping) found higher pregnancy rates after the first embryo transfer in the hysteroscopy group: about 68% versus 51%. Live birth rates were also higher with hysteroscopic removal.¹⁸ The advantage likely comes from hysteroscopy’s precision: it targets the polyp without disturbing as much of the surrounding healthy endometrium, which is the tissue an embryo needs to implant into.

Recurrence After Removal

One frustrating reality is that polyps can come back. Recurrence rates vary widely across studies depending on follow-up length and the population studied. One study reported recurrence in 43% of women, though that figure included longer follow-up periods where more time simply meant more opportunity for new polyps to form.⁴ Having multiple polyps at the time of original removal also predicted a higher chance of recurrence.⁴

A more recent study focused on reproductive-age women found a lower overall recurrence rate of 8%, with a median time to recurrence of about 3.5 years. The strongest risk factors for coming back included adenomyosis, polycystic ovarian syndrome, obesity, tamoxifen use, and uterine fibroids.¹⁹ An important finding from the same study: use of a levonorgestrel-releasing intrauterine system (a hormonal IUD) dramatically reduced recurrence. The odds of recurrence dropped by about 96% in women using one.¹⁹ This makes sense biologically: the IUD delivers progesterone locally, counteracting the estrogen-driven growth that fuels polyp formation. For people not planning pregnancy in the near term, a hormonal IUD after polypectomy is a practical two-for-one strategy.

Postmenopausal Bleeding and the Different Calculus

The clinical conversation changes after menopause. Any uterine bleeding in a postmenopausal person warrants investigation, and when a polyp is found in that setting, the threshold for removal is lower. As the data above shows, postmenopausal polyps do not spontaneously regress the way some premenopausal ones can.² And the malignancy risk, while still low in absolute terms, is meaningfully higher than in younger women, especially when bleeding is present.¹²

This does not mean every postmenopausal polyp is cancerous. The vast majority are still benign. But the combination of menopause plus bleeding plus a polyp plus any additional factors like obesity or hypertension creates a risk profile that most gynecologists would rather resolve with removal and tissue analysis than with “let’s wait and see.” The procedure itself carries the same low risk of complications as it does in premenopausal women, so the cost-benefit math tilts toward acting.

Newer Surgical Techniques

Hysteroscopic polypectomy has been around for decades, but the tools keep evolving. Traditional methods involve small scissors, grasping forceps, or electrosurgical loops to cut and remove the polyp. More recently, hysteroscopic morcellators have gained popularity. These devices use a rotating blade inside a tube to simultaneously cut and suction away polyp tissue, often making the procedure faster and reducing the need to pass instruments in and out of the cervix multiple times.

Research into even newer approaches continues. A recent trial compared a 450-nanometer laser technique with conventional electrosurgical excision and found no significant differences in hospital stay, complication rates, or surgeon satisfaction between the two methods.²⁰ At this point, the choice of instrument matters less than the fact that the polyp is removed completely and sent for pathologic evaluation. The specific tool is more about what a given surgeon is trained and comfortable with than about meaningfully different outcomes for the patient.

One study comparing polypectomy techniques did find that scissors-based removal carried a lower risk of complications and recurrence compared to grasping forceps.¹³ This is likely because scissors allow for more precise excision at the base of the polyp, reducing the chance that residual tissue is left behind to regrow. If you have a choice, asking your surgeon about the technique they plan to use and why is a reasonable question.