Postmenopausal Bleeding: Causes and What to Do Next

It’s been months or even years since you had your last period. Until one day, you notice a pink smear on the toilet paper, a brown patch in your underwear, or a trickle of blood after you have had sex. It might be so insignificant you think it is not worth mentioning. But it is.

After a woman has been through menopause (12 consecutive months without a period when no other cause explains it), unusual vaginal bleeding is labeled postmenopausal bleeding. This isn’t always a sign of something more serious, as the majority of women investigated for this do not have endometrial cancer. However, postmenopausal bleeding is abnormal and should be checked out by your doctor.¹²

We certainly don’t want to scare you. We aim to help you identify the problem early, understand the right treatment, and give you an answer rather than a concern.

On this page

1. What counts as postmenopausal bleeding?
2. Does postmenopausal bleeding mean cancer?
3. What can cause bleeding after menopause?
4. Could vaginal dryness really cause bleeding?
5. What happens to the uterine lining after menopause?
6. Can polyps cause postmenopausal bleeding?
7. Could hormone therapy or medication be causing it?
8. Could the blood be coming from somewhere else?
9. What will happen at the appointment?
10. What tests might you need?
11. What about the “4-mm rule”?
12. When might hysteroscopy be needed?
13. What if the bleeding stops or you have normal investigations?
14. How is postmenopausal bleeding treated?
15. When to see a doctor?

What counts as postmenopausal bleeding?

Postmenopausal bleeding means any vaginal bleeding or spotting that happens after menopause. This is different from perimenopause (the transition leading up to menopause), when ovulation can become erratic and periods may become more frequent, less frequent, or absent for several months before returning.¹

In contrast, menopause is the end of regular periods, so any new bleeding doesn’t mean that you are getting your periods back. Instead, you experience bleeding that could be pink, red, or brown, only a few drops, or it can look like a period. Therefore, the amount is not a reliable guide, and all spotting should be investigated.³

Does postmenopausal bleeding mean cancer?

No. The majority of women experiencing postmenopausal bleeding do not have endometrial cancer. A large systematic review of >40,000 women found that approximately 9% of women who were evaluated for postmenopausal bleeding were found to have endometrial carcinoma.² The remaining majority of women had some other cause.

The symptom is still regarded as serious, as approximately 91% of women with endometrial cancer in the same analysis have postmenopausal bleeding.² Bleeding alone is not a diagnosis of cancer; rather, it is a precursor to further investigation. Therefore, postmenopausal bleeding often brings endometrial cancer to attention while it is still at an early stage, when it is highly treatable.² Recognized endometrial cancer risk factors include the following.⁴

• Obesity
• Type 2 diabetes
• Endometrial hyperplasia (an abnormal thickening of the lining of the uterus)
• Tamoxifen (a medicine used to treat or help prevent some breast cancers)
• Lynch syndrome (an inherited condition that increases the risk of several cancers, including endometrial cancer)
• Nulliparity (never having given birth)
• Early menarche (starting periods at a younger age) or late menopause (reaching menopause at an older age)
• PCOS (polycystic ovary syndrome), now known as PMOS (Polyendocrine Metabolic Ovarian Syndrome),¹⁰ especially when it causes chronic anovulation (long stretches without ovulation)
• Long-term exposure to estrogen (a hormone that stimulates the uterine lining) without enough progesterone (a hormone that helps keep that growth in check) in someone who still has a uterus

None of these factors alone can tell us what is causing the bleeding.

What can cause bleeding after menopause?

There are several reasons for postmenopausal bleeding, many of which are benign.³⁵

Could vaginal dryness really cause bleeding?

Yes. Estrogen levels fall after menopause, and this can lead to the vagina and vulva becoming thinner, drier, and more delicate. These effects are called genitourinary syndrome of menopause (GSM) and can also result in burning, soreness, discomfort, painful intercourse, and problems with the bladder.⁵

Fragile tissue may bleed after friction, especially after sex. Even if this seems unlikely, the bleeding should be examined as it may also have come from the cervix or uterus.

What happens to the uterine lining after menopause?

The lining of the uterus is called the endometrium. In the menopausal years, it is often very thin and fragile enough to bleed. At other times, it becomes abnormally thick, in which case it is called endometrial hyperplasia.³ Certain types may show precancerous changes, necessitating tissue sampling.

Can polyps cause postmenopausal bleeding?

Yes. Polyps are tissue growths that can be found inside the uterus or on the cervix. In most instances, polyps are not harmful, but they can induce occasional spotting or bleeding following intercourse.³

If it is found, your doctor may suggest removing it and having the tissue tested.

Could hormone therapy or medication be causing it?

Menopausal hormone therapy may be associated with bleeding or spotting, especially during the first few months of use.⁶ However, any new bleeding that is ongoing, unexpectedly heavy bleeding, or occurs later should be discussed with the clinician providing your therapy.

For example, tamoxifen has been known to have effects on the lining of the uterus and to cause endometrial changes.⁴ Anticoagulants (blood-thinning medicines) can cause bleeding to be more apparent, but they do not tell you where it originated from.

Could the blood be coming from somewhere else?

Yes. Not all blood on toilet paper or underwear is vaginal. Blood from the urinary tract or bowel may be confused with vaginal bleeding. Blood may also originate from the vulva or cervix rather than the uterine cavity.³

You don’t need to find where the blood is coming from yourself. You can have a pelvic examination, which will assist your healthcare provider in identifying the source of the bleeding.

What will happen at the appointment?

Your OB-GYN will generally ask questions like when you entered menopause, when the bleeding began, what amount you noticed, if it occurred more than once, and if it happened after intercourse.

Other questions they might ask include: any dryness, pain, abnormal vaginal discharge, medications, and personal or family medical history. A pelvic examination can help identify fragile vaginal tissue, irritation, a cervical polyp, or another visible source.

Before the visit, note the color, approximate amount, timing, and whether the bleeding happened after sex.

What tests might you need?

In April 2026, the American College of Obstetricians and Gynecologists (ACOG) modified its recommendations on postmenopausal bleeding. In the majority of patients, the first step in evaluation involves transvaginal ultrasound and sampling of the endometrial tissue.⁷

A transvaginal ultrasound uses a narrow probe inserted into the vagina to view the uterus and measure the thickness of the endometrial lining.

An endometrial biopsy involves removal of a small part of this tissue to be examined for hyperplasia, precancerous changes, or cancer. You may experience some discomfort during the procedure, but it is usually not painful.

The tissue is sent to a pathology laboratory, where a pathologist (a doctor who examines cells and tissues for signs of disease) looks at it under a microscope. The National Cancer Institute notes that pathology reports are typically sent to the doctor within 10 days after a biopsy, so you can generally expect the report within about 10 days.⁸ While you wait, the sample is being processed and examined. The result may appear in your patient portal, and your doctor receives it too, and can then explain what it means and whether you need any further testing.⁸

What about the “4-mm rule”?

The older guidelines focus on the assessment of the thickness of the endometrial lining. If its thickness is 4 mm or less on ultrasound, it is reassuring. However, the 2026 ACOG update suggests obtaining a tissue sample for most patients and not relying solely on ultrasound findings.⁷

Why the change? ACOG notes that recent studies suggest 5–12% of endometrial cancers may be missed at the initial presentation when evaluation relies on ultrasound alone.⁷

When might hysteroscopy be needed?

In cases of insufficient tissue sampling from a biopsy, if the imaging is indicative of a polyp, or if bleeding persists, your doctor may suggest a hysteroscopy.

A tiny camera enters the cervix, allowing the doctor to examine the inside of the uterus and take a sample or remove a suspicious area.

What if the bleeding stops or you have normal investigations?

Please maintain a regular follow-up even if the bleeding settles. Even one episode of bleeding can have many different causes, and you do not need to be bleeding to be investigated by your doctor.

If your tests are reassuring but the bleeding comes back, get in touch with your doctor again. Some problems can be small or only involve a small part of the uterus and may require more detailed investigation.

How is postmenopausal bleeding treated?

Treatment varies depending on the cause. If thin, dry vaginal tissue is the cause, then vaginal moisturizers and lubricants can reduce chafing and low-dose vaginal estrogen may be indicated in certain individuals.⁵ Additionally, polyps can be extracted.

Endometrial hyperplasia may require progestin treatment, more attentive follow-up, or surgery depending on the appearance of the cells.

If cancer or a precancerous condition is found, you may be referred to a gynecologic oncologist (a doctor trained in treating cancers of the female reproductive system).

That is why it is important to be investigated. It is not just to exclude cancer; it is to find out what is happening and to treat it accordingly.

When to see a doctor?

Contact your healthcare provider for any vaginal bleeding after menopause, including one small episode of spotting. That includes:

• Pink, red, or brown blood-stained discharge
• Bleeding that happens only once
• Bleeding after sex
• New or unexpected bleeding while on hormone therapy
• Light spotting when you otherwise feel well

All of these usually do not require the emergency room, but should still be evaluated rather than ignored.

Frequently asked questions