What Are Uterine Polyps? Definition, Symptoms, and a Walkthrough Example

Understanding Uterine Polyps: Basic Definition

Uterine polyps are soft, finger‑like growths that arise from the endometrium, the inner lining of the uterus. They consist of glandular tissue, stroma, and blood vessels covered by a thin layer of epithelium. Most polyps are benign, though a small fraction can harbor precancerous or cancerous cells, which is why pathological examination is standard after removal.

Their size varies widely, from a few millimetres to several centimetres in diameter. They may appear as a single lesion or as multiple polyps scattered throughout the uterine cavity. Prevalence increases with age, peaking in women in their 40s and 50s, but they can also be found in younger individuals.

Many polyps cause no noticeable symptoms and are discovered incidentally during imaging performed for unrelated reasons. When symptoms do occur, they are usually related to abnormal uterine bleeding patterns. Because the presentation can be silent, routine gynecologic evaluation remains important for early detection.

How Polyps Form: Tissue Growth Mechanism

Estrogen drives endometrial proliferation during the menstrual cycle. In some women, localized over‑response to estrogen leads to focal hyperplasia of the endometrial lining, which then projects into the uterine cavity as a polyp. This process is similar to the way skin tags form in response to friction, but it is hormonally mediated.

Chronic exposure to unopposed estrogen — whether from obesity, hormone‑replacement therapy, or medications such as tamoxifen — raises the risk of polyp development. Insulin resistance and hypertension have also been associated with a higher incidence, likely through their effects on estrogen metabolism.

Genetic alterations in the endometrial cells, including mutations in genes that regulate cell growth, have been identified in a subset of polyps. These molecular changes help explain why some polyps persist or recur after removal, while others remain stable for years.

Typical Signs and Symptoms: What Patients Notice

The majority of uterine polyps are asymptomatic and found during routine pelvic ultrasound or hysteroscopy. When symptoms appear, they most often involve disturbances in menstrual bleeding. Women may report heavier periods, prolonged menstrual flow, or bleeding between cycles.

Postmenopausal bleeding is a particularly important red flag, because any uterine bleeding after menopause warrants investigation. Some patients also experience pelvic pressure or cramping, especially if a polyp is large enough to distort the uterine cavity.

Common symptom checklist:

list

['Irregular or heavy menstrual bleeding', 'Spotting between periods', 'Postmenopausal vaginal bleeding', 'Pelvic discomfort or pressure', 'Infertility or recurrent pregnancy loss in some cases']

• Irregular or heavy menstrual bleeding
• Spotting between periods
• Postmenopausal vaginal bleeding
• Pelvic discomfort or pressure
• Infertility or recurrent pregnancy loss in some cases

Scenario Walkthrough: A Worked Example of Diagnosis

Consider a 42‑year‑old woman who presents with intermenstrual spotting and a recent increase in menstrual flow over the past three months. She has no prior gynecologic surgery, uses no hormonal contraception, and reports a body‑mass index of 31. Her primary care clinician refers her for a gynecologic evaluation.

The gynecologist begins with a detailed menstrual history, followed by a bimanual pelvic exam that reveals a slightly enlarged, mobile uterus. A transvaginal ultrasound shows a 1.2 cm hyperechoic lesion within the endometrial cavity, suggestive of a polyp. To confirm, a saline infusion sonography (sonohysterogram) is performed, clearly delineating a pedunculated polyp attached to the posterior uterine wall.

The next step is diagnostic hysteroscopy under local anesthesia. The polyp is visualized directly, grasped with a hysteroscopic loop, and removed in its entirety. The tissue is sent for histopathology, which returns a benign endometrial polyp with no atypia. The patient’s bleeding resolves within two weeks, and a follow‑up ultrasound at six months shows a normal endometrial cavity.

Diagnostic Steps and When to Seek Care

Women should seek prompt evaluation if they experience any postmenopausal bleeding, unusually heavy or prolonged periods, or bleeding between cycles that persists beyond one or two cycles. Early assessment reduces the chance of missing a malignant lesion and allows timely symptom relief.

Management Overview and Follow‑Up Considerations

Management depends on symptom severity, polyp size, patient age, and fertility goals. Asymptomatic, small polyps in premenopausal women may be monitored with repeat imaging. Hormonal options such as a levonorgestrel‑releasing intrauterine system can reduce bleeding and sometimes shrink polyps, but they do not eliminate the lesion.

Definitive treatment is hysteroscopic polypectomy, which removes the polyp under direct vision. The procedure is usually outpatient, carries low complication rates, and provides tissue for pathology. Recurrence rates range from 10‑30 % over five years, especially in the presence of ongoing hormonal risk factors.

After removal, a follow‑up ultrasound at six to twelve months is common practice to confirm a normal endometrial cavity. Patients should discuss individualized surveillance intervals with their gynecologist, particularly if they have obesity, hypertension, or are on tamoxifen therapy.