Uterine polyps are soft, rounded, oval, or finger-like growths attached to the endometrium, the uterine lining. They range from a few millimeters to several centimeters, and most grow inside the uterine cavity, where you cannot see them from the outside.
This overview explains how these growths may appear, which bleeding changes need review, and how imaging and tissue examinations help a clinician evaluate a suspected polyp.
Typical Appearance and Location
A small growth attached by a narrow stalk may resemble a teardrop within the uterine cavity. A broad-based growth looks more like a rounded bump resting against the uterine wall. The attachment may help distinguish a stalked lesion from a thicker structure with limited movement.
Each growth projects into the cavity instead of blending evenly with the surrounding lining. Its outline may range from soft and oval to elongated and finger-like, depending on how it forms and where it attaches.
| Feature | Appearance | What it means |
|---|---|---|
| Size | Several millimeters to several centimeters | This describes the span across the lesion, not its length alone. |
| Shape | Rounded, oval, or finger-like | The lesion projects from the uterine lining into the cavity. |
| Attachment | Narrow stalk or broad base | A polyp may move differently from the uterine wall. |
| Location | Inside the uterine cavity | It is not normally visible from the outside. |
One rounded growth might sit near the fundus, the upper portion of the uterus. Another might have a thin attachment and move slightly when fluid surrounds it. Internal imaging can reveal these details, although appearance alone cannot establish the tissue type.
Once a lesion is suspected, its cause and risk profile help explain why it formed and whether further attention is warranted.
Common Causes and Risk Factors
The cause is not always clear. Hormonal exposure appears to play a role, but the endometrium also responds to estrogen and progesterone as the menstrual cycle changes. This environment may allow one area of tissue to keep growing instead of shrinking with the rest of the lining.
Factors linked with higher risk
- Increasing age: The likelihood rises during the years approaching and after menopause.
- Higher body weight: More adipose tissue can contribute to greater estrogen exposure.
- High blood pressure: This vascular factor has been associated with increased odds.
- Reproductive history: Some variations in menstrual and reproductive history are associated with higher odds.
- Estrogen exposure: Greater estrogen influence may support growth of the uterine lining.
No single factor explains every case. You may have several risk factors and never develop a growth, while another person may have few known factors and still develop one. Age, hormones, tissue response, and reproductive history interact differently in each person.
Most growths contain noncancerous tissue. A small number may contain abnormal cells, and abnormal uterine bleeding can also come from another condition. Clinical evaluation helps distinguish these possibilities.
Bleeding Patterns and Other Signs
Because growths can arise within this changing lining, they most often come to medical attention through a change in menstrual bleeding. A period that once lasted three days may now continue for eight, with heavier flow during the opening days. This pattern warrants review, but it does not confirm that a polyp is present.
Changes that may appear
- Heavier periods: You pass more blood or larger clots than during your usual menstrual flow.
- Longer periods: Menstrual bleeding continues beyond your personal baseline or beyond seven days.
- Bleeding between periods: Light or heavier bleeding appears between menstrual cycles.
- Bleeding after menopause: Any uterine bleeding after menopause requires prompt medical review.
- No symptoms: A growth may appear during imaging for another reproductive health concern.
Uterine polyp symptoms can include cramping or pelvic pressure, but pain is not a dependable clue. Many people have no pain. Fibroids, pregnancy-related changes, ovulation bleeding, hormone shifts, and several other conditions can also cause irregular bleeding, so symptoms alone cannot identify the cause.
Track when bleeding starts, how long it lasts, how often you change protection, and whether you pass clots. Specific details help a clinician interpret your pattern.
A symptom record cannot distinguish one condition from another by itself. It gives you and your clinician a clearer starting point, particularly with irregular bleeding or a marked change from your established menstrual pattern.
Ultrasound Signs of Uterine Polyps
Internal imaging can show the same oval or finger-like growth described earlier, although it may look quite different on a screen. On transvaginal ultrasound, a suspected lesion may appear as a smooth, bright mass within the uterine cavity. Here, “bright” describes its echo pattern rather than its physical color, texture, or danger.
Features clinicians assess
- Position: The mass’s location within the cavity contributes to the assessment.
- Attachment: A visible connection to the uterine wall helps define the lesion.
- Movement: A stalked growth may shift with surrounding fluid, unlike a firm lesion attached to the wall.
- Size: Measurements document the lesion and allow later comparison.
- Blood flow: Ultrasound can show how blood moves through or around the mass.
- Surrounding tissue: The endometrium, ovaries, and uterine wall offer useful comparison points.
| Finding | Possible interpretation | Important limitation |
|---|---|---|
| Smooth bright cavity mass | Compatible with a polyp | The exact tissue type remains unconfirmed. |
| Movable structure | May support a stalked polyp | Blood clots can move in a similar way. |
| Broad-based mass | May suggest a wider attachment | A submucosal fibroid can have a similar outline. |
| Material within cavity fluid | May represent blood or thickened lining | It can obscure a small polyp. |
A uterine polyp ultrasound may reveal a small growth, but a lesion can be difficult to distinguish from nearby lining or blood products. Saline infusion sonohysterography or hysteroscopy may provide a clearer view of the cavity and the growth’s attachment.
The Diagnostic Process
The smooth cavity mass seen on ultrasound is only one part of the evaluation. A clinician combines your bleeding history, a physical examination, and internal imaging because several different structures can produce similar findings. This combination narrows the cause without treating an image as a definitive diagnosis.
Assessment of a suspected growth
- Review your history: Record menstrual changes, bleeding between periods, pregnancy history, medications, and relevant health conditions.
- Examine the pelvis: A pelvic examination checks for other possible causes, although it cannot directly reveal every polyp.
- Assess bleeding patterns: The clinician compares your current flow with your usual cycle and asks about dizziness or weakness.
- Use transvaginal ultrasound: The scan measures the endometrium and checks the uterine cavity for a localized growth.
- Refine cavity imaging: Saline infusion sonohysterography places sterile fluid in the cavity, outlining the lining and suspected attachment.
- Consider hysteroscopy: A small scope enters the cavity, allowing direct inspection of a polyp and nearby tissue.
Direct visualization helps distinguish a polyp from a blood clot, thickened lining, or a fibroid projecting into the cavity. It also lets a clinician document the lesion’s attachment, which may shape the next decision.
An endometrial biopsy or removal of a suspected lesion may be discussed to examine the tissue and distinguish normal growth from abnormal cells. The appropriate path depends on your symptoms, age, bleeding pattern, and the clinician’s findings.
The answer depends on what your symptoms, examination, and images show. Ultrasound can suggest the diagnosis, while hysteroscopy or tissue examination may be needed to define it more clearly. An incidental finding and persistent abnormal uterine bleeding may therefore lead to different testing plans.
The differing testing plans become more important when symptoms or an incidental finding affect whether prompt evaluation and treatment are necessary.
Reasons for Prompt Evaluation and Available Management
Because tissue assessment may be needed to separate a benign growth from other findings, postmenopausal bleeding requires a focused evaluation. New, persistent, or heavier uterine bleeding can also come from conditions other than a polyp, so treatment should not depend on symptoms or appearance alone.
Findings that call for prompt medical attention
- Bleeding after menopause: Seek medical review for any new uterine bleeding after menstruation has stopped.
- Very heavy bleeding: Obtain urgent care if bleeding soaks protection quickly or causes dizziness, weakness, or fainting.
- Severe pelvic pain: Sudden or intense pain requires assessment, especially with bleeding or fever.
- Pregnancy-related bleeding: Bleeding during pregnancy requires prompt advice from a maternity care professional.
- Persistent irregular bleeding: Repeated bleeding between periods requires review even when you have no pain.
- Concerning imaging features: A lesion may need closer review because of its attachment, blood flow, tissue pattern, or changes over time.
A polyp without symptoms may be observed in selected cases. The clinician considers its size, appearance, your age, and the reason it was found. Follow-up imaging can document any change. Persistent bleeding, fertility-related concerns, or a need to examine the tissue may lead to removal, known as polypectomy.
Before an appointment, write down your bleeding dates, flow changes, clot size, pain, and possible pregnancy. Specific observations help the clinician choose the appropriate evaluation.
For example, a tiny incidental finding without symptoms may call for observation, while bleeding after menopause may lead to closer cavity assessment and tissue review. If you have fertility-related concerns, ask an appropriate specialist doctor how a growth could affect pregnancy.
Ask which finding supports the diagnosis, whether another condition could account for the bleeding, and what changes would alter the plan. Clear answers can clarify the next step without assuming that every growth requires the same response.
Uterine polyp treatment ranges from observation to removal, depending on symptoms and clinical findings. Knowing when to see a doctor for uterine polyps matters because unexpected bleeding can signal a problem that needs evaluation, even when the growth appears small.
Key Takeaways
- Polyps are usually small, rounded, oval, or finger-like growths attached to the uterine lining.
- Symptoms and ultrasound clues can suggest a polyp, but neither can confirm its tissue type alone.
- Record changes in bleeding, including their timing, duration, flow, and associated symptoms.
- Postmenopausal bleeding, severe symptoms, or persistent unexpected uterine bleeding requires prompt medical evaluation.
FAQ
What do uterine polyps look like?
Inside the uterine cavity, polyps are soft, rounded, oval, or finger-like growths attached to the endometrium. They may have a narrow stalk or broad base, range from a few millimeters to several centimeters, and usually sit inside the uterine cavity. They are not visible from the outside.
Are uterine polyps visible from the outside?
That not normally visible from the outside because they develop inside the uterus. A clinician may detect one during transvaginal ultrasound, saline infusion sonohysterography, or hysteroscopy. Bleeding between periods, after menopause, or with other changes can prompt that evaluation.
What symptoms can uterine polyps cause?
Uterine polyp symptoms can include heavier or longer periods, bleeding between periods, bleeding after menopause, cramping, or pelvic pressure. Some people have no symptoms. These changes can also come from fibroids, hormonal shifts, pregnancy-related changes, or other conditions, so symptoms alone cannot identify a growth.
Can ultrasound detect uterine polyps?
Transvaginal ultrasound may reveal a suspected polyp as a smooth, bright mass within the uterine cavity. Position, attachment, movement, blood flow, and size provide useful clues. Blood clots, thickened endometrium, and fibroids projecting into the cavity can look similar, so ultrasound alone cannot confirm tissue type.
How are uterine polyps diagnosed and distinguished from other conditions?
Doctors combine your medical and menstrual history with a pelvic examination and transvaginal ultrasound. Saline infusion sonohysterography can outline the cavity, while hysteroscopy provides direct visualization of the lesion and its attachment. An endometrial biopsy or removed-tissue examination may be needed to identify the cells.
Do uterine polyps always require treatment?
No. A polyp without symptoms may be observed in selected cases, depending on its size, appearance, your age, and the reason it was found. Persistent bleeding, fertility-related concerns, or a need to examine the tissue may lead to removal through polypectomy.
