Short answer
No, bleeding after menopause is usually not cancer, but it always needs a prompt checkup. A 2018 meta-analysis found endometrial cancer in about 9% of women with postmenopausal bleeding. The same review found bleeding in about 91% of women with endometrial cancer. That is why ACOG says any bleeding after menopause should be evaluated, not watched.
What the numbers say
The largest pooled study, a 2018 meta-analysis in JAMA Internal Medicine, combined 129 studies covering 40,790 women. Among women with bleeding after menopause, 9% were diagnosed with endometrial cancer, the cancer of the uterine lining. The authors put it plainly: most women with postmenopausal bleeding will not be diagnosed with endometrial cancer.
The other number explains the urgency. Among women who did have endometrial cancer, 91% had bleeding after menopause, whatever the stage. ACOG's 2018 committee opinion gives a range of 1% to 14%, depending on age and risk factors.
What usually causes it
ACOG says bleeding after menopause is usually caused by thinning of the vagina or uterine lining (atrophy), a result of low estrogen. Its patient guide lists four common causes: polyps, which are noncancerous growths; endometrial atrophy; endometrial hyperplasia; and endometrial cancer.
Hyperplasia means the lining has grown too thick. It is not cancer, but in some cases it can lead to cancer, and early treatment may lower that risk. ACOG also lists hormone therapy, infection of the uterus or cervix, some medications and other cancers as possible causes.
How the checkup changed in April 2026
ACOG's older advice let a transvaginal ultrasound alone rule out cancer if the uterine lining measured 4 mm or less. On 16 April 2026, ACOG published an update: most women with postmenopausal bleeding should now have both the ultrasound and a sample of the lining (an endometrial biopsy).
Ultrasound alone is still an option only for a single episode of bleeding, a fully seen lining no thicker than 4 mm, and no strong risk factors. The reason: newer studies found the 4 mm cutoff caught 88% to 95% of cancers, so 5% to 12% could be missed at the first visit.
When to go, and how fast
ACOG defines postmenopausal bleeding as bleeding from the uterus 12 or more months after your final period. Any amount counts. Book a visit with your ob-gyn; do not wait to see if it happens again. If it does happen again after a clear first result, ACOG says that needs immediate re-evaluation.
Go to emergency care if you are soaking a pad or tampon every hour for more than 2 hours in a row and also have chest pain, shortness of breath, or feel lightheaded or dizzy.
Related questions
Does spotting after menopause count?
Yes. ACOG's guidance covers any bleeding after menopause, so light spotting should be checked too.
I'm on hormone therapy. Is bleeding expected?
Some bleeding can occur early on, but ACOG's 2026 update says unscheduled bleeding more than 6 months after starting hormone therapy should be evaluated.
Does a thin lining on ultrasound rule out cancer?
Not always. ACOG now recommends both an ultrasound and a tissue sample for most women, because the 4 mm cutoff missed 5% to 12% of cancers in newer studies.
Read next
Sources
- Clarke et al., JAMA Internal Medicine: Association of endometrial cancer risk with postmenopausal bleeding in women, a systematic review and meta-analysis (2018)
- ACOG Clinical Practice Update: Updated guidance regarding the role of transvaginal ultrasonography in evaluating the endometrium of individuals with postmenopausal bleeding (Obstetrics & Gynecology, published online 16 April 2026)
- ACOG Committee Opinion No. 734: The role of transvaginal ultrasonography in evaluating the endometrium of women with postmenopausal bleeding (2018, reaffirmed 2023)
- ACOG FAQ162: Perimenopausal bleeding and bleeding after menopause (last reviewed February 2024)
- ACOG FAQ095: Abnormal uterine bleeding (last reviewed August 2025)
Published 2026-10-07 · Last checked 2026-10-07
Educational content, not medical advice. Made for the United States.