If you’ve noticed any bleeding or spotting after you’ve been through menopause, the single most important thing to know is this: it should always be checked out, even if it happens just once and even if it’s very light. Most causes turn out to be manageable and not cancer, but bleeding after menopause is the main warning sign doctors look for, so it’s never something to ignore or delay.
What counts as “postmenopausal bleeding”?
Postmenopausal bleeding (PMB) means any vaginal bleeding that happens more than 12 months after your last ever period. This includes spotting, light pink or brown discharge, or heavier bleeding — all of it counts.
What about bleeding on menopausal hormone therapy?
If you’re taking continuous menopausal hormone therapy (MHT, also called HRT) some unpredictable spotting can occur within the first 6 months and if you are changing your dose or type of MHT. (Note that a withdrawal bleed is expected on cyclical MHT, which you may be taking in perimenopause.)
While some spotting early on with MHT is common and usually not concerning, you should get it checked if:
- It’s unusually heavy.
- Bleeding starts after 6 months on MHT.
- You have new or worsening pain in the pelvis.
- Bleeding after sex.
A note on “bioidentical” or “natural” hormones: there isn’t good-quality evidence on the safety of these preparations, and because many contain estrogen, they are likely to carry similar risks to other forms of hormone therapy.
Why does this need to be checked?
It’s understandable to feel worried when you see unexpected bleeding. The most common cause of postmenopausal bleeding is thinning of the vaginal tissue (vaginal atrophy) and in most cases, after investigation, the explanation for the bleeding is benign (not cancerous). However, 90-95% of people diagnosed with endometrial cancer experienced postmenopausal bleeding as the symptom that led to their diagnosis. Meaning that it is a reliable early warning sign about a potentially serious problem.
What increases the risk?
Some factors are linked to a higher chance that bleeding is caused by endometrial cancer or a pre-cancerous change. Having one or more of these doesn’t mean you have cancer — it simply means your doctor may recommend more thorough testing:
- Use of estrogen therapy without a balancing progestogen
- Tamoxifen, a medication sometimes used after breast cancer
- A body mass index (BMI) over 30
- Never having given birth
- A strong family history of endometrial or bowel cancer, or a known genetic condition such as Lynch syndrome
- Type 2 diabetes
- Polyendocrine metabolic ovary syndrome (PMOS)
What to expect at your appointment
Your doctor will start by talking with you and examining you. This usually includes:
- A detailed history: when the bleeding happens, whether it occurs after sex, what medications you’re taking (including blood thinners, herbal remedies, or tamoxifen), whether you’re on MHT and have missed any doses, and when you last had a cervical screening test.
- A physical examination, including a speculum exam to look at the vulva, vagina and cervix for any visible cause of bleeding, and a check for signs of tissue thinning (atrophy). A cervical screening test can be done during this examination, if one is required.
The tests that help find the cause
Transvaginal ultrasound (TVUS). This is usually the first test. A small probe is used to scan the pelvis and measure the thickness of the lining of the womb (the “endometrium”). It’s a screening tool, not a diagnostic one on its own.
Endometrial biopsy. A small sample of the womb lining is taken for laboratory testing. This is more likely to give a useful result if it’s done at the same time as a hysteroscopy.
Hysteroscopy. A thin camera is used to look directly inside the womb. It’s considered a highly accurate way to spot abnormalities and guide treatment, and numbing gel on the cervix can reduce discomfort during the procedure.
An important, recent update to how these tests are used together
For a long time, ultrasound alone was considered enough to “rule out” cancer in most people if the womb lining measured 4 mm or less. Updated clinical guidance now recommends that both ultrasound and a tissue biopsy be done together as the initial evaluation for most people with postmenopausal bleeding — not ultrasound alone. This is because ultrasound alone has been shown to miss some cancers.
Ultrasound alone may still be reasonable for some people, but only when all of the following apply: this is a single episode of bleeding, the lining is fully visualised on ultrasound and measures 4 mm or less, there are none of the risk factors listed above, and you have good access to prompt follow-up care if bleeding continues or comes back.
This is a genuine shift in practice, and it means more people will be offered a biopsy as part of their initial work-up than in the past. It’s a good example of guidelines updating as more evidence becomes available — the goal is simply to catch as many cancers as early as possible.
What happens after testing
Depending on what your tests show, your care team will guide you through one of these general paths:
- If everything is benign (non-cancerous), you’ll be offered treatment for the specific cause found.
- If the sample is low-risk or insufficient and there’s no ongoing bleeding, your doctor may simply monitor you rather than repeat testing straight away.
- If bleeding continues or risk factors are present, further assessments such as hysteroscopy with a D&C (a procedure to sample the lining more thoroughly) may be recommended.
- If a pre-cancerous or cancerous change is found, you’ll be advised about further management.
A gentle reminder
Waiting for test results, or simply noticing bleeding you weren’t expecting, can be an anxious experience. That’s a completely normal reaction. The good news is that the pathway for investigating postmenopausal bleeding is well established, and getting checked promptly is the single most effective step you can take — whatever the underlying cause turns out to be.
If you’ve noticed bleeding after menopause, please don’t wait for it to happen again — get it checked out by making an appointment with your doctor or with Dr Holbeach for advice tailored to you.
This article provides general health information based on published clinical guidance and does not replace individual medical advice. Every person’s situation is different — please speak with Dr Holbeach or your own doctor about what’s right for you.
