The most common symptom of uterine cancer is abnormal vaginal bleeding, and it appears early enough to catch the disease in most cases. About 90% of women diagnosed with endometrial cancer (the most common type of uterine cancer) reported bleeding before their diagnosis. Knowing what counts as “abnormal” depends on whether you’re still menstruating or have already gone through menopause.
Abnormal Vaginal Bleeding
Bleeding is the symptom that brings most women to their doctor, and it looks different depending on your age. If you’re premenopausal, watch for bleeding between periods, periods that are unusually heavy or prolonged, or any significant change in your cycle pattern. If you’re over 40 and experiencing extremely heavy or frequent periods, that warrants attention even if the bleeding seems “normal” for a period.
If you’ve already been through menopause, any vaginal bleeding or spotting is considered abnormal. Even a small amount matters. Roughly 9% of postmenopausal women who see a doctor for unexpected bleeding are eventually diagnosed with endometrial cancer. That means the vast majority of postmenopausal bleeding turns out to be something else, but the odds are high enough that it should always be evaluated.
One complication: if you’re on hormone replacement therapy, bleeding during the first six months of use can be a side effect of the medication itself. Persistent bleeding beyond that initial window is more concerning and worth a closer look.
Unusual Vaginal Discharge
Not every case of uterine cancer announces itself with bleeding. Some women notice a change in vaginal discharge instead. The discharge associated with endometrial cancer is often thin, watery, or whitish. It may not contain visible blood at all. This symptom is easy to dismiss or attribute to hormonal changes, especially around menopause, but a new or persistent watery discharge that doesn’t have an obvious explanation is worth mentioning to your doctor.
Pelvic Pain and Pressure
Pelvic pain or a feeling of pressure in the lower abdomen is a recognized symptom of uterine cancer. In early stages, uterine cancer often causes no pain at all, which is why bleeding tends to be the first clue. But as a tumor grows, it can create a sense of heaviness, cramping, or dull aching in the pelvic area. Some women describe it as feeling similar to menstrual cramps that don’t follow their usual cycle. In later stages, you may feel a noticeable mass or fullness in the pelvis as the tumor enlarges.
Pain During Intercourse
New or unexplained pain during sex can be a sign of uterine cancer, though it has many other possible causes, including fibroids, endometriosis, and vaginal dryness related to menopause. The key distinction is whether the pain is new. If intercourse was previously comfortable and has become painful without an obvious reason, that change is worth investigating. Even if cancer isn’t the cause, treatable conditions like vaginal dryness or benign growths are often responsible, so there’s no reason to simply tolerate it.
Symptoms in Later Stages
When uterine cancer advances, it can produce symptoms beyond the reproductive system. Unexplained weight loss is one of the more common later-stage signs. You may also feel a palpable mass in the pelvis. As the tumor grows large enough to press on nearby structures, it can cause urinary changes (like needing to urinate more often or feeling pressure on the bladder) or changes in bowel habits. Fatigue and a general sense of feeling unwell can accompany these later stages, though these symptoms are vague and overlap with many other conditions.
The good news is that uterine cancer rarely reaches this point without earlier warning signs. Because abnormal bleeding drives most women to seek care, the majority of cases are caught while the cancer is still confined to the uterus.
Why There’s No Routine Screening Test
Unlike cervical cancer (which has the Pap smear) or breast cancer (which has mammography), there is no recommended screening test for uterine cancer in women who have no symptoms. The American Cancer Society has found no evidence supporting routine screening in asymptomatic women and some evidence against it, largely because the available tests can produce false positives that lead to unnecessary procedures.
The one exception is women who carry a hereditary condition called Lynch syndrome, which significantly raises the risk of endometrial cancer. These women are typically offered annual screening starting at age 35.
For everyone else, symptom awareness is the primary form of early detection. At menopause, women should understand the risks and know to report any unexpected bleeding or spotting promptly.
What Happens When You Report Symptoms
If you report abnormal bleeding, the first step is usually a transvaginal ultrasound to measure the thickness of the uterine lining. In postmenopausal women, a lining of 4 millimeters or less has a greater than 99% chance of ruling out endometrial cancer. That’s reassuring, but it’s not a guarantee. Rare types of endometrial cancer can develop even when the lining appears thin, which is why persistent or recurrent bleeding should lead to a tissue biopsy regardless of what the ultrasound shows.
If the ultrasound can’t get a clear image of the lining, your doctor will typically move to a more detailed imaging procedure or take a tissue sample directly. The biopsy itself is usually done in the office and involves collecting a small sample of tissue from inside the uterus. It’s the only way to confirm or rule out cancer definitively.
Who Is Most at Risk
Uterine cancer is most commonly diagnosed after menopause, with the average age at diagnosis in the early 60s. Several factors increase risk: obesity (fat tissue produces estrogen, which stimulates the uterine lining), never having been pregnant, starting periods early or reaching menopause late, and taking estrogen without progesterone. A family history of uterine, ovarian, or colon cancer, particularly Lynch syndrome, also raises risk. Women with polycystic ovary syndrome or a history of irregular ovulation face higher odds because their uterine lining is exposed to estrogen without the balancing effect of progesterone.
None of these risk factors mean cancer is inevitable. But if you have one or more of them, it makes paying attention to bleeding changes even more important.