Can a Small Endometrial Polyp Disappear Without Treatment?

Yes, a small endometrial polyp (also called a uterine polyp) can disappear on its own without treatment, a process known as spontaneous regression ^[1][2]. However, this does not happen for everyone. Studies suggest that polyps go away on their own in roughly 6% to 23% of cases ^[3][1]. Polyps that are smaller than 1 centimeter (10 mm) have a higher chance of shrinking or disappearing completely ^[2].

Because some polyps do go away, doctors sometimes recommend a “watch and wait” approach—medically called expectant management—rather than immediate surgery ^[4]. But whether it is appropriate to observe a polyp depends on a careful, individualized assessment of your age, symptoms, and medical history.

Who Can Consider Watching and Waiting?

There is no universal checklist that guarantees watching a polyp is risk-free, as the risk of precancer or cancer in a polyp is never strictly zero. However, expectant management is generally considered a reasonable option for certain patients ^[4][5]:

• You are premenopausal (still having regular menstrual periods): Polyps are more likely to disappear in women who have not yet gone through menopause ^[1].
• You have no symptoms (asymptomatic): The most common symptom of a polyp is abnormal uterine bleeding, such as spotting between periods or heavy menstrual flow. If you do not have abnormal bleeding, observation may be considered ^[4].
• The polyp is small: Polyps under 1 centimeter (10 mm) are the most likely to regress ^[2]. Some clinical guidelines allow observation for polyps up to 2 centimeters ^[5], but this depends heavily on your doctor’s assessment.
• You do not have cancer risk factors: Risk factors for endometrial (uterine) cancer include older age, obesity, diabetes, high blood pressure, conditions like Lynch syndrome, and the use of the breast cancer drug tamoxifen ^[6][7][8]. Having these risks often makes removal a safer choice ^[4].

Note on Fertility: If you are trying to conceive, especially if you are undergoing fertility treatments like intrauterine insemination (IUI), your doctor may recommend removing even a small, asymptomatic polyp, as this can improve the chances of pregnancy ^[9][10].

How Long Is It Monitored?

There is no single timeline or expiration date for observing a polyp. In medical studies, researchers have monitored small, asymptomatic polyps for periods ranging from a few months to over a year ^[1][3].

Because the growth of a polyp is difficult to predict, your timeline will be personalized. Your doctor may schedule follow-up imaging, like a transvaginal ultrasound (an ultrasound wand placed in the vagina), to check the polyp’s size ^[3]. However, an ultrasound alone cannot prove a polyp is completely benign ^[11]. Therefore, the most critical part of watching and waiting is tracking your periods and reporting any new bleeding to your doctor ^[3].

When Should Waiting Stop?

The “watch and wait” approach should end, and you should discuss a hysteroscopy (a minor procedure using a thin, lighted tube to look inside the uterus and remove the polyp), if any of the following occur:

• You develop abnormal bleeding: If you start experiencing bleeding between periods or heavier-than-normal periods, prompt medical evaluation is necessary ^[4]. While bleeding can have other causes, guidelines generally do not recommend expectant management for symptomatic polyps ^[4].
• You are postmenopausal (have gone a full year without a period): Medical guidelines advise against waiting and watching in postmenopausal women with bleeding, because the risk of precancer or cancer is higher ^[4][12]. Any postmenopausal bleeding requires prompt evaluation to rule out endometrial cancer ^[4][13]. Even without bleeding, asymptomatic postmenopausal women are often advised to have polyps removed if they are larger than 2 centimeters or if other risk factors are present ^[4].
• The polyp grows or looks suspicious: If follow-up imaging shows the polyp is growing or has unusual features, your doctor will likely recommend removal ^[4][11].

When a polyp is removed, the tissue is sent to a lab for histopathologic examination ^[4]. This means a laboratory examines the tissue under a microscope to confirm exactly what the polyp is made of and ensure there are no precancerous or cancerous cells.

🚨 When to Seek Urgent Care

While tracking symptoms is important, some issues require immediate medical attention. Go to an emergency room or seek urgent care if you experience:

• Very heavy bleeding (soaking through a pad or tampon every hour for two or more consecutive hours)
• Fainting, severe dizziness, or shortness of breath
• Severe, sudden pelvic pain
• Bleeding if there is any chance you could be pregnant