A uterine polyp is anchored to the wall of the uterus, so it generally doesn’t slip out with a period the way loose lining does. Some polyps do disappear without treatment, though, by shrinking away rather than being passed. Whether yours might depends largely on its size and your stage of life, which is why waiting is a real option for some women and not for others.
Why a Polyp Doesn’t Come Out With Your Period
Each month the inner lining of the uterus thickens under the influence of hormones and then sheds as your period. Most polyps are made of immature lining that doesn’t respond to those hormone signals, so they are not shed at the time of menstruation, even while the lining around them is.1PubMed Central. Endometrial polyps: Pathogenesis sequelae and treatment Polyps also have dense, fibrous inner tissue and thick-walled blood vessels feeding them, which keeps them firmly in place.2PubMed Central. Endometrial polyps: Pathogenesis sequelae and treatment
Polyps grow from the uterine wall, either on a thin stalk or with a broad base. Even a stalked polyp stays rooted; it can occasionally poke through the cervix, but it is still attached and needs a doctor to remove it.
“Passing” a polyp and a polyp “going away” are also different things. Passing would mean expelling tissue. Regression means the polyp shrinks until it can’t be seen, and that happens quietly over months, not in one heavy period. So a lack of anything unusual in your period blood doesn’t tell you whether a polyp has gone; only a repeat scan or a camera look can.
What you might be seeing instead is a clot or a piece of shed lining, both of which can look like a lump of tissue. Tissue in your pad or cup is far more likely to be one of those than a polyp. Clots are usually dark red or jelly-like and often fall apart when pressed between tissue or a gloved finger, while shed lining can look like stringy gray-pink strands, though appearance alone can’t reliably tell you what tissue is. Clots tend to show up on the heaviest days and are common in many women with no polyp at all.
If you’re unsure, save the tissue in a clean container and show it to your doctor. Passing something firm, large, or very painful is worth a prompt call rather than waiting for your next visit. The same goes for noticing clearly different tissue when a pregnancy, even an early one, is possible.
How Often Polyps Disappear on Their Own
Gynecology guidelines say about 25% of polyps resolve if simply watched.3PubMed. To treat or not to treat? An evidence-based practice guide for the management of endometrial polyps Disappearance is most likely when the polyp is smaller than 10 mm, about the width of a pencil eraser.4PubMed. AAGL practice report: practice guidelines for the diagnosis and management of endometrial polyps Individual studies land far apart, though. In one group of women followed for a little over two years, only about 6 in 100 polyps disappeared completely.5PubMed. The natural history of endometrial polyps In a group checked again before planned surgery, about 23 in 100 had gone.6PubMed Central. Endometrial polyps: Is the prediction of spontaneous regression possible?
Size matters most. While women waited for surgery, the share of polyps that went away was:7PubMed Central. Predictive factors of spontaneously regressed uterine endometrial polyps during the waiting period before hysteroscopic polypectomy
- Under 5 mm: about 12%
- 5 to 9.9 mm: about 17%
- 10 to 14.9 mm: about 3%
- 15 to 19.9 mm: about 1%
- 20 mm or larger: none
Your ultrasound report usually gives the polyp’s size in millimeters, sometimes as two or three measurements. Use the largest one when comparing with these figures. It’s also worth asking how many polyps were seen, since one small polyp is a different picture from several.
Disappearance is linked to being under 45, not yet through menopause, and having a polyp under 2 cm.8PubMed Central. Endometrial polyps: Is the prediction of spontaneous regression possible? When rechecked by camera, every polyp in postmenopausal women was still there.9PubMed Central. Endometrial polyps: Is the prediction of spontaneous regression possible? In women given hormone medication or just observed, about a third of polyps went away overall, mostly after medication.10PubMed. Clinical outcomes in women with endometrial polyps underwent conservative management The numbers differ because studies enrolled different women and polyp sizes, waited different lengths of time, and used different tests to look again. A less sensitive scan can count a polyp as gone when it was simply missed, which pushes the rate up. Doctors often suggest a recheck after a few months or at a yearly visit.
Is It Safe to Wait
Across tens of thousands of women whose polyps were removed and examined, under 3 in 100 polyps contained cancer.11PubMed. The risk of malignancy in uterine polyps: A systematic review and meta-analysis The risk was about 1 in 100 before menopause and about 5 in 100 after.12PubMed. The risk of malignancy in uterine polyps: A systematic review and meta-analysis Polyps causing symptoms such as bleeding contained cancer about 5 in 100 times, versus about 2 in 100 without symptoms.13PubMed. The risk of malignancy in uterine polyps: A systematic review and meta-analysis Risk rises with age and polyp size, and is highest in postmenopausal women with bleeding.14The ObG Project. Endometrial Polyps – Do They Always Need To Be Removed? Polyps found after menopause without any bleeding are unlikely to be cancer.15The ObG Project. Endometrial Polyps – Do They Always Need To Be Removed? Low risk makes waiting reasonable, but it isn’t a guarantee, which is why follow-up is part of waiting.
Women without abnormal bleeding, especially before menopause, are the usual candidates for watching. Guidelines treat it as an option for symptom-free women after menopause too, after discussing the risks. Any bleeding after menopause changes the picture and needs prompt evaluation.
Watching is not ignoring. It usually means a planned recheck scan and an agreement about which symptoms would bring you in sooner. Waiting should end with:
- New bleeding between periods or after sex
- Any spotting after menopause
- Periods becoming much heavier or longer than your usual
In one hospital series of about 200 removed polyps, 3 contained cancer and 9 showed abnormal precancerous cells.16PubMed Central. Malignancy risk factors based on endometrial polyp Removal lets a lab look at the tissue itself, which a scan can’t fully replace.
How Doctors Check Whether It’s Gone
Tests differ in how well they find polyps. A standard ultrasound through the vagina misses roughly 4 in 10.17PubMed Central. Comparison of diagnostic accuracy of saline infusion sonohysterography, transvaginal sonography, and hysteroscopy in evaluating the endometrial polyps in women with abnormal uterine bleeding: a systematic review and meta-analysis A saline sonohysterogram, where salt water is gently passed into the uterus during ultrasound, finds about 9 in 10.18PubMed. Accuracy of saline contrast sonohysterography in detection of endometrial polyps and submucosal leiomyomas in women of reproductive age with abnormal uterine bleeding: systematic review and meta-analysis Hysteroscopy, a thin camera passed through the cervix, finds a similar share and also lets the doctor remove a polyp at once.19PubMed Central. Comparison of diagnostic accuracy of saline infusion sonohysterography, transvaginal sonography, and hysteroscopy in evaluating the endometrial polyps in women with abnormal uterine bleeding: a systematic review and meta-analysis So if a regular ultrasound shows nothing, ask whether a saline ultrasound or hysteroscopy is worth doing before concluding the polyp is gone. A thick lining at certain points in the cycle can hide or mimic a small polyp, and a polyp seen once and not later may have regressed or may have been missed the first time.
A saline ultrasound is done in an office and feels similar to a pelvic exam, with a thin tube passed through the cervix. Most women feel cramping like a period for a few minutes. It’s usually timed just after a period, when the lining is thinnest and easiest to see.
For a hysteroscopy, the doctor passes a slim lighted camera through the vagina and cervix, usually with salt water or gas gently opening the uterus so the lining can be seen directly. It can be done in an office, often with little or no sedation, or in an operating room under anesthesia.
Saline ultrasound is generally the less invasive way to confirm whether a polyp remains, and it doesn’t remove anything. The camera makes more sense when you already expect to need removal, or when a scan leaves the question unresolved. Neither is automatically needed after a normal-looking standard ultrasound; it depends on your symptoms and plans.
Can Medication Shrink a Polyp
Polyps seem to grow in response to estrogen.20ColumbiaDoctors. Uterine Polyps Higher body weight raises estrogen levels and the risk of polyps.21ColumbiaDoctors. Uterine Polyps The breast cancer drug tamoxifen is also a risk factor, with 8 to 36 in 100 postmenopausal users developing polyps.22ColumbiaDoctors. Uterine Polyps A levonorgestrel IUD, such as Mirena, lowers polyp rates in tamoxifen users.23PubMed. Non-contraceptive benefits of hormonal and intrauterine reversible contraceptive methods In a small early study, polyps shrank after a hormonal IUD in women with heavy periods.24PubMed. The Role of the Mirena Intrauterine Device in the Management of Endometrial Polyps: A Pilot Study Medicines that counter estrogen’s effect on the lining haven’t been proven to clear an existing polyp, so the evidence supports prevention and bleeding control more than removal.
A levonorgestrel IUD releases a progestin directly into the uterus, which thins the lining. Because it acts mostly locally, many women get its effect with fewer whole-body hormone effects than with some pills. It is also a contraceptive, so it isn’t the right choice for someone trying to conceive. If you take tamoxifen, ask your oncologist and gynecologist together about monitoring.
When Removal Is Recommended and What It Involves
Removal is recommended for any woman with abnormal uterine bleeding from a polyp.25PubMed. To treat or not to treat? An evidence-based practice guide for the management of endometrial polyps Other reasons include infertility and repeated miscarriage.26The ObG Project. Endometrial Polyps – Do They Always Need To Be Removed? Polyps causing symptoms after menopause should be removed and tested.27PubMed. AAGL practice report: practice guidelines for the diagnosis and management of endometrial polyps For a polyp under 10 mm without symptoms, though, yearly observation is a reasonable choice.28The ObG Project. Endometrial Polyps – Do They Always Need To Be Removed?
Removing the polyp is usually done through a hysteroscope with no cuts on the belly.29PubMed. AAGL practice report: practice guidelines for the diagnosis and management of endometrial polyps The method of hysteroscopic removal doesn’t change outcomes.30PubMed. AAGL practice report: practice guidelines for the diagnosis and management of endometrial polyps Done in an office without general anesthesia, it worked in about 8 in 10 women.31PubMed. Outpatient hysteroscopic polypectomy in 237 patients: feasibility of a one-stop “see-and-treat” procedure Success fell from about 96% for polyps under 1 cm to about 19% for those over 4 cm.32PubMed. Outpatient hysteroscopic polypectomy in 237 patients: feasibility of a one-stop “see-and-treat” procedure The main reasons it failed in the office were pain and large polyp size.33PubMed. Outpatient hysteroscopic polypectomy in 237 patients: feasibility of a one-stop “see-and-treat” procedure Some women can’t tolerate the cramping without anesthesia, and a large polyp may need to come out in pieces, which is harder in an awake patient.
Minor complications occurred in about 2 in 100 procedures.34PubMed. Effectiveness of Hysteroscopic Techniques for Endometrial Polyp Removal: The Italian Multicenter Trial Office procedures and polyps in the corners near the tubes are more likely to leave a piece behind.35PubMed. Effectiveness of Hysteroscopic Techniques for Endometrial Polyp Removal: The Italian Multicenter Trial Large or hard-to-reach polyps may be better done in an operating room, so ask which setting suits your polyp’s size and position.
On the day, you’ll usually be asked to avoid eating or to follow instructions about pain medicine beforehand, depending on the setting. The procedure itself is typically short, and the polyp is sent to a lab for examination. Afterward, most women have cramping and light bleeding for a few days, and normal activities usually resume within a day or two. Lab results typically come back within a week or two.
Polyps and Getting Pregnant
Polyps are common in women having trouble conceiving and may interfere with sperm movement or embryo implantation.36PubMed Central. Endometrial Polyps and Subfertility Removal appears to improve fertility outcomes.37PubMed. AAGL practice report: practice guidelines for the diagnosis and management of endometrial polyps The benefit is clearest for unexplained infertility and women planning insemination, with weak evidence for improving IVF success.38PubMed Central. Management of endometrial polyps in infertile women: A mini-review No agreed size cutoff exists for which polyps to remove in women trying to conceive, though small ones sometimes vanish.39PubMed Central. Management of endometrial polyps in infertile women: A mini-review
Waiting a few months may be reasonable for a tiny polyp, especially for a younger woman with time to spare. If you’re older or each cycle counts, removing the polyp sooner may be preferred to avoid losing time.
Useful questions for your fertility doctor: Does waiting a few months for a small polyp to regress fit my timeline? Is removal before insemination or embryo transfer advised in my case? How soon after removal can I try to conceive?
Can a Polyp Come Back
New polyps can form after removal. In one group checked by camera after surgery, about 4 in 10 women had polyps again.40PubMed Central. Factors Influencing the Recurrence Potential of Benign Endometrial Polyps after Hysteroscopic Polypectomy Having several polyps raised the chance of new ones, and the chance rose the longer women were followed.41PubMed Central. Factors Influencing the Recurrence Potential of Benign Endometrial Polyps after Hysteroscopic Polypectomy Overall recurrence rates aren’t well established, though.42PubMed. The management of polyps in female reproductive organs Removal doesn’t change the hormone environment that encouraged the growth, so new polyps may form from other areas of the lining. Report new bleeding after removal rather than assuming it’s normal.
Because estrogen drives growth, managing weight may help. Tamoxifen users can ask about a hormonal IUD. A recurrence is usually treated the same way as the first polyp.
If your bleeding has resolved and you feel well, routine imaging isn’t always needed. A repeat scan is more likely if symptoms come back, if there were multiple polyps, or if the lab found something unusual.