The first sign of womb cancer is almost always abnormal vaginal bleeding. For women who have been through menopause, that means any bleeding at all. For women who still have periods, it typically shows up as bleeding between periods or periods that are noticeably heavier or more irregular than usual. Around 90% of women diagnosed with womb cancer reported abnormal bleeding as their initial symptom, which makes it both the most common and the most important warning sign to recognize.
Bleeding After Menopause
Any vaginal bleeding after menopause is abnormal, full stop. It doesn’t matter how light or brief it is. While most cases of postmenopausal bleeding turn out to be caused by something other than cancer, about 9% of women who experience it are ultimately diagnosed with womb cancer. That number shifts depending on other factors: women not taking hormone therapy have a slightly higher risk (around 12%) than those who are (around 7%).
The bleeding can look different from person to person. Sometimes it’s bright red, sometimes it’s more of a watery, pink, or white discharge rather than obvious blood. Some women notice only light spotting on their underwear or when wiping. Others experience something closer to a period. The amount doesn’t indicate whether cancer is present, so even a single episode of postmenopausal bleeding is worth getting checked.
Warning Signs Before Menopause
Womb cancer is less common in premenopausal women, but it does happen, and the signs are easier to miss because they overlap with normal menstrual variation. The key patterns to watch for are bleeding between periods, periods that have become significantly heavier than your baseline, and cycles that have become unpredictable after years of regularity. A single unusual period probably isn’t cause for alarm, but a persistent change over two or more cycles deserves attention.
Women under 45 are more likely to dismiss these symptoms or attribute them to stress, hormonal shifts, or perimenopause. That delay can matter. If your bleeding pattern has changed in a way that feels unusual for your body, bring it up with your doctor even if you feel too young for womb cancer to be on the radar.
Symptoms Beyond Bleeding
Abnormal bleeding is the hallmark, but it’s not the only possible sign. Some women notice a vaginal discharge that is watery, pale, or slightly blood-tinged, without experiencing what they’d describe as actual bleeding. This kind of discharge is easy to overlook or attribute to infection, but if it persists without a clear cause, it can be an early indicator.
Pelvic pain or a feeling of pressure in the lower abdomen tends to appear later, once the cancer has grown larger or started to spread. Pain during sex and difficulty or pain when urinating can also develop but are less common as early symptoms. Unexplained weight loss and fatigue are late-stage signs. By the time those appear, the disease has usually progressed beyond its earliest stages.
Who Is Most at Risk
The single biggest risk factor is excess body weight. Fat tissue produces estrogen, and after menopause, it becomes the body’s primary estrogen source. Higher levels of estrogen stimulate the lining of the womb to grow, and over time that overgrowth can become cancerous. This is sometimes called the “unopposed estrogen” pathway, because after menopause there’s no progesterone cycling to counterbalance the growth signal.
Other factors that increase risk include never having been pregnant, starting periods early or reaching menopause late (both of which increase lifetime estrogen exposure), having polycystic ovary syndrome, using estrogen-only hormone therapy, and taking tamoxifen for breast cancer treatment. Type 2 diabetes raises risk independently of weight, though the two often overlap.
One genetic condition stands out. Women with Lynch syndrome, an inherited condition that affects DNA repair, face a lifetime risk of womb cancer between 42% and 54%, compared to about 2.6% in the general population. If your family has a pattern of bowel, womb, or ovarian cancers diagnosed at younger ages, genetic counseling can determine whether Lynch syndrome is a factor.
What Happens When You Get Checked
If you report abnormal bleeding, your doctor will typically start with a transvaginal ultrasound. This scan measures the thickness of the womb lining. In postmenopausal women, a lining of 4 millimeters or less has a greater than 99% negative predictive value for womb cancer, meaning it’s extremely unlikely cancer is present. If the lining is thicker than 4 millimeters, or if the ultrasound can’t provide a clear image, the next step is a tissue sample.
The most common way to get that sample is an office biopsy, where a thin tube is inserted through the cervix to collect a small piece of the womb lining. It takes a few minutes, doesn’t require anesthesia, and has a sensitivity above 94% for detecting abnormal cells. Some women experience cramping similar to period pain during and shortly after the procedure. If the office biopsy is inconclusive or can’t be performed, a more thorough sampling under sedation may be recommended.
Why Early Detection Changes the Outcome
Womb cancer caught while it’s still confined to the womb has a five-year survival rate of nearly 95%. That’s one of the highest survival rates among gynecological cancers, and it reflects the fact that abnormal bleeding usually prompts investigation before the cancer has spread. Once the cancer reaches nearby lymph nodes, survival drops to about 70%. If it has spread to distant organs, the five-year survival rate falls to roughly 20%.
The gap between those numbers is the entire argument for taking abnormal bleeding seriously. Most womb cancers are diagnosed at the localized stage precisely because the bleeding is hard to ignore. Women who act on that symptom promptly give themselves the best chance of a straightforward treatment and a full recovery. The women who face worse outcomes are disproportionately those whose symptoms were subtle (discharge rather than bleeding), those who delayed seeking care, or those with aggressive cancer subtypes that progressed quickly.