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Post menopausal bleeding, defined as any vaginal bleeding that occurs 12 or more months after your last period, is one symptom that should never be filed under "wait and see." It might be light. It might look like spotting. It might be easy to dismiss as nothing. Don't. The rule is straightforward: any bleeding after menopause needs investigation, because a small but real proportion of cases turn out to be endometrial cancer, and the ones caught early are the ones treated most successfully.
That said, most women who experience post menopausal bleeding do not have cancer. The causes are often benign, and treatment is usually straightforward once the source is identified. The problem is that no one can tell you which category you're in without proper assessment.
What causes post menopausal bleeding?
The uterine lining doesn't just switch off at menopause. It thins, becomes more fragile, and responds to shifts in the hormonal environment. That fragility creates several possible triggers for bleeding.
Endometrial atrophy is the most common cause. The lining becomes so thin that small, spontaneous bleeds occur. It's benign, but it produces the same symptom as something more serious, which is why investigation still matters.
Endometrial polyps are another frequent culprit. These are small, non-cancerous growths on the inner wall of the uterus. They're common in postmenopausal women and often produce spotting or intermittent bleeding. Most are removed during a simple outpatient procedure called a hysteroscopy.
Vaginal atrophy, sometimes called genitourinary syndrome of menopause (GSM), causes the vaginal walls to thin and become easily irritated. This can produce bleeding that looks uterine but is actually coming from the vaginal tissue itself. GSM affects a significant proportion of postmenopausal women, and it responds well to local oestrogen therapy. If you want to understand the broader symptom picture of postmenopause, the article on post menopause symptoms covers what to expect and which ones actually have good treatment options.
Submucosal fibroids, which sit inside the uterine cavity, can also persist after menopause and occasionally bleed. Hormone therapy is another trigger. Some women on MHT (menopausal hormone therapy) experience breakthrough bleeding, particularly in the first few months. If you're on MHT and bleeding occurs outside of an expected withdrawal bleed, that should also be reported to your doctor. For more on how MHT works and what to expect, see MHT for menopause: what it is and how it works.
Endometrial hyperplasia, an abnormal thickening of the uterine lining, sits in a more serious category. It's not cancer, but some types carry a risk of becoming cancerous without treatment. And then there's endometrial cancer itself, which accounts for roughly 5 to 10 percent of post menopausal bleeding presentations.
How it's investigated
Your GP will almost always refer you for a pelvic ultrasound first. This measures the thickness of the endometrium (the uterine lining). In postmenopausal women not taking HRT, an endometrial thickness above 4 to 5mm generally warrants further investigation. Below that threshold, the risk of significant pathology is low, though not zero.
If the ultrasound raises concerns, or if bleeding persists despite a thin endometrium, the next step is usually a hysteroscopy with endometrial biopsy. A hysteroscopy lets the doctor look directly inside the uterine cavity using a thin camera, and a biopsy takes a tissue sample for lab analysis. This is the definitive way to rule out or confirm endometrial cancer.
The wait for these appointments can feel agonising. Book the GP appointment the day you notice the bleeding. Don't delay because the bleed was light or only happened once.
What to say to your doctor
Be specific. Note when you first noticed the bleeding, how heavy it was, whether there was any pain, and whether you're currently taking any hormone therapy. Mention if you've noticed any other symptoms like pelvic pressure or unusual discharge. The more detail you bring, the faster the assessment can move.
If your GP seems dismissive or suggests monitoring without investigation, ask directly for an ultrasound referral. Post menopausal bleeding has a clear clinical pathway: the first response is imaging, not watchful waiting. If you're unsure how to find a clinician who will take these concerns seriously, the guide on how to find a menopause doctor near you is worth reading before your appointment.
What happens after diagnosis
If the cause turns out to be atrophy or a benign polyp, treatment is usually effective and recovery is fast. Local oestrogen in cream or pessary form significantly reduces bleeding from vaginal atrophy. Polyps are removed under hysteroscopy, typically as a day procedure.
Endometrial hyperplasia without atypia (the lower-risk type) is usually treated with progestogen therapy or a Mirena IUD. Hyperplasia with atypia, or early endometrial cancer, will typically require a hysterectomy. Endometrial cancer caught at Stage 1, which is common when women seek investigation promptly, has a five-year survival rate above 90 percent according to data from Cancer Council Australia.
That number is the most important thing to take from this article. The symptom is common, the causes are mostly benign, and the outcomes when cancer is found early are genuinely good. What makes the difference is not ignoring the bleed.
A note on risk factors
Some women carry higher baseline risk for endometrial cancer. Obesity, type 2 diabetes, a history of polycystic ovary syndrome, late menopause (after 55), and never having been pregnant all raise risk slightly. Women who took tamoxifen for breast cancer treatment also have elevated endometrial cancer risk and should report any bleeding immediately.
None of this means you should catastrophise every spot of blood. It means you shouldn't wait to find out.