What uterine cancer is
Uterine cancer starts in the cells that line the uterus (also called the womb), the organ where a pregnancy develops. The most common type is endometrial cancer, which begins in the inner lining called the endometrium. Cancer cells start when something causes the normal cells in this lining to grow in an abnormal way and multiply without stopping.
The uterus is a hollow, pear-shaped organ in the lower abdomen. When cancer develops there, it can stay in the uterus for a while before spreading to other parts of the body. Catching it early, when it is still in the uterus, makes treatment more straightforward and outcomes better.
Uterine cancer is different from cervical cancer (which starts in the cervix, the opening to the uterus) and ovarian cancer (which starts in the ovaries). Each type has different warning signs, different ways doctors find it, and different treatment paths.
Key Takeaways
- Uterine cancer most often starts in the endometrium, the inner lining of the uterus, and is usually found because of abnormal vaginal bleeding.
- Unusual vaginal bleeding after menopause or between periods during reproductive years is the most common warning sign and should be reported to a doctor.
- Doctors use a combination of pelvic exams, imaging tests like ultrasound, and a tissue sample (biopsy) to confirm uterine cancer.
- The stage of the cancer — how far it has spread — determines what treatment options are available and what to expect going forward.
- Risk factors include obesity, diabetes, high blood pressure, and taking estrogen without progesterone, though cancer can develop without any known risk factor.
Warning signs and when to see a doctor
The most common warning sign of uterine cancer is abnormal vaginal bleeding. After menopause, any vaginal bleeding is abnormal and worth reporting. During reproductive years, bleeding that is heavier than usual, lasts longer than normal, or happens between periods can also be a sign.
Other signs include pelvic pain or pressure, pain during sex, or watery or blood-tinged vaginal discharge. Some people have no symptoms at all and discover the cancer during a routine exam or imaging test done for another reason.
Abnormal bleeding does not mean you have cancer — many conditions cause it, including hormonal changes, fibroids, or polyps. But it is always worth mentioning to your doctor so they can figure out what is happening. The sooner you report it, the sooner you can get answers.
How doctors identify uterine cancer
The process usually starts with your doctor asking about your symptoms and doing a pelvic exam, where they feel the uterus and surrounding organs to check for lumps or other changes. This exam alone cannot confirm cancer, but it can raise suspicion.
If cancer is suspected, your doctor will order an ultrasound, usually done through the vagina (called a transvaginal ultrasound). This creates a picture of the uterus and lets the doctor see if the endometrium is thicker than it should be. A thickened endometrium can be a sign of cancer, but it can also be caused by other things.
The only way to know for certain is a biopsy — a small tissue sample taken from the endometrium. Your doctor passes a thin tube through the cervix into the uterus and removes a tiny piece of tissue. This is usually done in an office setting and takes just a few minutes. The tissue is then looked at under a microscope by a pathologist (a doctor who studies cells and tissue) to see if cancer cells are present.
If cancer is found, your doctor may order additional imaging tests like a CT scan or MRI to see if the cancer has spread beyond the uterus. Blood tests may also be done to check your overall health before treatment begins.
Types and grades of uterine cancer
Most uterine cancers are endometrial adenocarcinomas, meaning they start in the glandular cells of the endometrium. There are two main categories based on how the cancer cells look and behave under the microscope.
Type 1 cancers are usually linked to too much estrogen and tend to be found earlier because they cause bleeding. They generally grow more slowly. Type 2 cancers are not linked to estrogen, are often found later, and tend to grow faster and spread more readily.
Doctors also assign a grade based on how abnormal the cells look. Grade 1 means the cells look fairly normal; Grade 3 means they look very abnormal. Higher grades suggest the cancer may grow and spread faster. The grade, combined with the type and how far the cancer has spread, helps your doctor decide on treatment.
Stages and what they mean
After a diagnosis, doctors determine the stage of the cancer — how far it has spread. Staging uses Roman numerals from I to IV. Stage I means the cancer is only in the uterus. Stage II means it has spread to the cervix. Stage III means it has spread to the pelvis or nearby lymph nodes. Stage IV means it has spread to the bladder, bowel, or distant organs like the lungs or liver.
Your doctor will explain your stage and what it means for your treatment options. Earlier stages usually have more treatment choices and better outcomes. Even advanced stages have treatment options, though the goals may shift toward managing symptoms and quality of life.
Risk factors and who is most affected
Uterine cancer is more common in people over 60, but it can happen at any age after puberty. Several factors raise the risk, though having a risk factor does not mean cancer will develop.
Obesity is one of the strongest risk factors because fat tissue produces estrogen, and too much estrogen can trigger endometrial cancer. Diabetes and high blood pressure also raise risk. Taking estrogen alone (without progesterone) as hormone replacement therapy increases risk, which is why doctors now typically prescribe both hormones together or progesterone alone.
A personal or family history of certain cancers, including breast or ovarian cancer, can raise risk. Some inherited genetic conditions, like Lynch syndrome, significantly increase the chance of uterine cancer. Tamoxifen, a drug used to treat breast cancer, can also raise uterine cancer risk.
People who have never been pregnant, those who have had few pregnancies, and those who started menstruation early or went through menopause late have higher risk because their endometrium has been exposed to estrogen for longer periods.
What happens after diagnosis
Once uterine cancer is confirmed and staged, your doctor will discuss treatment options. The main treatments are surgery, radiation, chemotherapy, or a combination. Most people with early-stage uterine cancer have surgery to remove the uterus, fallopian tubes, and ovaries.
After surgery, your doctor may recommend additional treatment depending on the stage and grade. This might include radiation therapy (using high-energy beams to kill cancer cells), chemotherapy (drugs that kill cancer cells throughout the body), or hormone therapy. Your doctor will explain which treatments are recommended for your specific situation and what the side effects might be.
Follow-up care is important. You will have regular check-ups to watch for any signs that cancer has returned. Your doctor will also monitor you for any long-term effects of treatment.
Frequently Asked Questions
Is uterine cancer hereditary?
Most uterine cancers are not inherited, but some people carry genetic mutations that raise their risk significantly. Lynch syndrome is the most common inherited condition linked to uterine cancer. If you have a family history of uterine, colon, or ovarian cancer, talk to your doctor about whether genetic testing makes sense for you.
Can uterine cancer be prevented?
You cannot prevent uterine cancer with certainty, but you can lower your risk. Maintaining a healthy weight, managing diabetes and high blood pressure, and discussing hormone therapy options with your doctor are all steps that may help. If you take tamoxifen for breast cancer, your doctor will monitor you more closely for signs of uterine cancer.
What is the difference between uterine cancer and endometrial cancer?
Endometrial cancer is the most common type of uterine cancer — it starts in the endometrium, the inner lining. Uterine cancer is the broader term that includes endometrial cancer and rarer types that start in the muscle layer or other parts of the uterus. When doctors say "uterine cancer," they usually mean endometrial cancer.
Does abnormal bleeding always mean cancer?
No. Many conditions cause abnormal bleeding, including fibroids, polyps, hormonal changes, infections, and blood clotting disorders. But abnormal bleeding is always worth reporting to your doctor so they can figure out the cause. Most cases of abnormal bleeding are not cancer, but the only way to know is to have it checked.
What should I do if I have symptoms?
Contact your doctor and describe what you have noticed — when the bleeding started, how heavy it is, whether it is continuous or comes and goes, and any other symptoms like pain or discharge. Write down when symptoms happen so you can give your doctor specific details. Your doctor will decide whether to do an exam or order tests based on what you report.