Abnormal or Postmenopausal Bleeding: When to Get Checked
Any vaginal bleeding after menopause requires prompt investigation. A consultant sonographer explains the causes, the red flags, and how a pelvic ultrasound provides a same-day structural answer.
- Women's Health
- Pelvic Ultrasound
- Updated July 2026
The Short Answer
Any vaginal bleeding after menopause — even a single episode of spotting — requires prompt investigation. The majority of causes are benign, but postmenopausal bleeding is the most common presenting symptom of endometrial (womb) cancer, and early investigation is the reason that most cases are caught at a treatable stage. A pelvic ultrasound is the standard first-line test, and it can be performed privately at Sonoworld on the same day, without a GP referral.
For women who are still menstruating, abnormal uterine bleeding — bleeding between periods, unusually heavy periods, or bleeding after sex — also warrants investigation when it is new, persistent, or changing. This guide covers both.
What Counts as Abnormal Bleeding?
Postmenopausal Bleeding
Postmenopausal bleeding is any vaginal bleeding, spotting, or blood-tinged discharge that occurs after 12 consecutive months without a period. There is no "safe" amount — even a single episode of light spotting should be investigated promptly. NHS guidance is clear on this point: postmenopausal bleeding should be assessed the same day you notice it, not at the next available routine appointment.
Abnormal Uterine Bleeding (Premenopausal)
For women who are still menstruating, abnormal uterine bleeding includes:
- Bleeding between periods (intermenstrual bleeding)
- Unusually heavy periods — soaking through a pad or tampon every hour for several consecutive hours, or passing clots larger than a 50p coin
- Periods that last longer than seven days
- Bleeding after sexual intercourse (post-coital bleeding)
- Irregular cycles that have changed significantly from your normal pattern
Any of these, when new or worsening, warrants investigation.
Common Causes of Abnormal and Postmenopausal Bleeding
The majority of causes are benign. Investigation is not about assuming the worst — it is about identifying the cause quickly so that benign conditions can be managed and serious ones can be caught early.
| Cause | Who It Affects | What Ultrasound Shows |
|---|---|---|
| Endometrial (vaginal/uterine) atrophy | Most common cause of postmenopausal bleeding | Thin endometrial lining — generally reassuring |
| Uterine polyps | Pre- and postmenopausal women | Small echogenic lesions within the uterine cavity |
| Endometrial thickening (hyperplasia) | Postmenopausal women; women on HRT | Thickened endometrial echo — measured precisely by transvaginal scan |
| Fibroids | Premenopausal women (most common cause of heavy periods) | Solid masses within or on the uterine wall; size and location mapped |
| Endometrial cancer | Postmenopausal women (most common presentation) | Thickened, heterogeneous endometrium; irregular cavity; vascular changes on Doppler |
| Cervical polyps | Pre- and postmenopausal women | May be visible at the cervical os; further assessment by gynaecologist |
| Ovarian pathology | Pre- and postmenopausal women | Ovarian cysts or masses; assessed alongside the uterus |
| Hormone replacement therapy (HRT) | Postmenopausal women on HRT | Endometrial thickness varies by HRT type; baseline scan important |
The most important measurement in postmenopausal bleeding is the endometrial thickness. A transvaginal ultrasound measures the womb lining precisely. According to RCOG and NICE guidelines, a thin endometrial echo (typically <4mm in postmenopausal women not on HRT) is generally reassuring and significantly reduces the likelihood of endometrial cancer. A thickened lining triggers further investigation — typically a referral for hysteroscopy and biopsy.
How a Pelvic Ultrasound Investigates Abnormal Bleeding
A pelvic ultrasound for abnormal bleeding is performed in two parts. The transabdominal component gives an overview of the uterus, ovaries, and pelvis. The transvaginal component — using a slim internal probe — provides the detailed close-up images needed to measure the endometrial lining accurately and identify polyps, fibroids, or other structural changes within the uterine cavity.
The transvaginal scan is the most informative part for this indication. It is not painful for most women — the probe is slim and the examination is gentle. For a full description of what the procedure involves, see our guide: Transvaginal Ultrasound: Your Questions Answered.
At Sonoworld, the appointment takes 20–30 minutes. You receive verbal results during the scan, and a written report is sent to you within 24 hours. The report includes the endometrial thickness measurement, a description of any findings, and a clear recommendation for next steps where relevant.
To book: Book Pelvic Ultrasound Scan — £235
From Our Practice
The most consistent pattern we see with postmenopausal bleeding is delay. A patient notices a single episode of spotting, waits to see if it recurs, and books a scan several weeks later. By the time she arrives, she has spent those weeks in a state of low-level anxiety that was entirely avoidable — because in the majority of cases, the scan finds a benign cause and provides a clear, reassuring answer the same day.
The measurement that matters most in these appointments is the endometrial thickness. A thin lining — typically below 4mm in a postmenopausal woman not taking HRT — is a genuinely reassuring finding. It does not eliminate all risk, but it substantially reduces the probability of endometrial cancer and allows the patient to leave with a clear picture of what the scan found and what, if anything, needs to happen next.
When the lining is thickened or the cavity contains a polyp, the conversation is different — but it is still a conversation that happens in the room, not in a letter that arrives days later. The patient leaves knowing what was found, what it might mean, and what the next step is. That clarity is what the scan is for.
The second pattern is women on HRT who have noticed breakthrough bleeding and are unsure whether it is expected or needs investigation. HRT type, dose, and duration all affect the endometrial picture. A baseline scan before starting HRT, and a follow-up scan if bleeding changes, is the most useful approach — and it is one that many women are not offered on the NHS until symptoms become significant.
Observations above are drawn from composite patterns across our patient population, not from any individual case. They are not a substitute for individual medical advice.
When to Seek Urgent Care
The following require same-day medical assessment — through your GP, NHS 111, or A&E — rather than a booked private scan:
- Any postmenopausal bleeding — contact your GP the same day
- Heavy bleeding that soaks through a pad or tampon every hour for several consecutive hours
- Bleeding accompanied by severe pelvic pain, dizziness, or faintness
- Bleeding with a high temperature or unusual discharge (possible infection)
- Bleeding when you are, or could be, pregnant — seek same-day review to exclude ectopic pregnancy
A private pelvic ultrasound is appropriate as a same-day investigation for postmenopausal bleeding — but it should be booked alongside, not instead of, a GP contact. The scan provides structural information; your GP provides clinical oversight.
Abnormal Bleeding FAQs
I had one episode of spotting after menopause. Do I really need a scan?
Yes. Any vaginal bleeding after menopause — even a single episode of light spotting — requires prompt investigation. NHS guidance recommends same-day GP contact. The majority of causes are benign, but postmenopausal bleeding is the most common presenting symptom of endometrial cancer, and early investigation is what makes most cases treatable. Do not wait to see if it recurs. Always seek individual professional assessment.
What does the endometrial thickness measurement mean?
The endometrial thickness is the measurement of the womb lining on transvaginal ultrasound. In postmenopausal women not taking HRT, a thin lining (typically below 4mm) is generally reassuring and significantly reduces the likelihood of endometrial cancer. A thickened lining (typically above 4mm) requires further investigation — usually a referral for hysteroscopy and biopsy. The threshold varies depending on HRT use and clinical context; your sonographer will explain the measurement in the context of your specific situation.
Can I have a pelvic ultrasound while bleeding?
Yes. A pelvic ultrasound can be performed while you are bleeding. Remove a tampon before the transvaginal part of the scan. If bleeding is heavy, inform the sonographer — an absorbent pad is placed on the couch and the scan proceeds as normal. Bleeding does not affect the accuracy of the endometrial thickness measurement.
I am on HRT and have noticed some breakthrough bleeding. Should I be concerned?
Breakthrough bleeding in the first three to six months of starting HRT is common and often settles. Bleeding that starts after a period of no bleeding, or that is new or worsening after six months on HRT, warrants investigation. A pelvic ultrasound can assess the endometrial lining in the context of your HRT type and duration. Always discuss new or changing bleeding with your GP or prescribing clinician.
How quickly can I get a pelvic ultrasound at Sonoworld?
Same-day and next-day appointments are available. You can book online at any time or call 020 3633 4902 during clinic hours. No GP referral is required. The scan costs £235, all-inclusive, with verbal results in the room and a written report within 24 hours.
Sources
- National Institute for Health and Care Excellence. Suspected cancer: recognition and referral (NG12). NICE, 2015 (updated 2023). nice.org.uk/guidance/ng12
- Royal College of Obstetricians and Gynaecologists. Postmenopausal Bleeding (Green-top Guideline No. 67). RCOG, 2016. rcog.org.uk
- NHS. Post-menopausal bleeding. Accessed July 2026. nhs.uk
- Sonoworld clinical imaging team. Composite practice patterns — Sonoworld Diagnostic Services, Marylebone, London. July 2026.
Book a Pelvic Ultrasound Scan
£235 all-inclusive. Same-day appointments available. No GP referral needed. Verbal results in the room, written report within 24 hours.
29 Weymouth Street, Marylebone, London W1G 7DB | 020 3633 4902
