Endometrial Cancer: Abnormal Uterine Bleeding and Treatment

Endometrial cancer is a cancer that begins in the lining of the uterus and most often causes abnormal uterine bleeding, especially after menopause. Early medical evaluation can help identify the cause of bleeding and guide timely, personalized treatment.

Overview

Endometrial cancer is a type of uterine cancer that starts in the endometrium, the inner lining of the uterus. The uterus is the pelvic organ where pregnancy develops. Each month before menopause, the endometrium normally thickens and then sheds during menstruation if pregnancy does not occur.

This cancer is different from cervical cancer, which begins in the cervix, and from uterine sarcoma, a rarer cancer that starts in the muscle or supporting tissues of the uterus. Endometrial cancer is often found at an early stage because it commonly causes abnormal uterine bleeding. This makes it especially important for women to report new or unusual bleeding rather than assuming it is a normal part of aging or hormonal change.

There are different types of endometrial cancer. The most common is endometrioid adenocarcinoma, which is often linked to estrogen exposure and may grow more slowly. Other types, such as serous carcinoma, clear cell carcinoma, and carcinosarcoma, may behave more aggressively and often require additional treatment. A pathology report after biopsy or surgery helps doctors understand the exact type and grade of the cancer.

Symptoms: Abnormal Uterine Bleeding

The most common symptom of endometrial cancer is abnormal uterine bleeding. For a woman who has gone through menopause, any vaginal bleeding, spotting, or brown discharge should be checked by a doctor. Menopause is usually defined as 12 months without a menstrual period, not caused by pregnancy, medication, or another medical condition.

Before menopause, warning signs can include periods that are much heavier than usual, bleeding between periods, bleeding after sex, or cycles that become unusually irregular. These symptoms are common and can be caused by non-cancerous conditions such as fibroids, polyps, hormonal changes, or infection. However, because endometrial cancer can also cause these symptoms, proper medical assessment is the safest approach.

Other symptoms may appear, particularly if the cancer is more advanced, but they are less specific. These may include pelvic pain or pressure, pain during intercourse, unexplained weight loss, fatigue, or changes in bowel or bladder habits. Symptoms alone cannot confirm a diagnosis, so doctors use tests to identify the cause.

• Any bleeding after menopause should be evaluated.
• Persistent bleeding between periods should not be ignored.
• Heavy or prolonged menstrual bleeding deserves medical attention, especially after age 40.
• New pelvic pain with abnormal bleeding should be assessed promptly.

Causes and Risk Factors

Endometrial cancer develops when cells in the uterine lining acquire changes in their DNA that allow them to grow in an uncontrolled way. In many cases, the exact reason this happens is not known. However, several factors can increase risk, especially conditions that expose the endometrium to estrogen without enough balancing progesterone.

Risk factors include older age, obesity, early first period, late menopause, never having been pregnant, polycystic ovary syndrome, and certain estrogen-containing hormone treatments when used without progesterone in women who still have a uterus. Diabetes and high blood pressure are also commonly associated with increased risk, partly because they often occur together with metabolic changes and excess body weight.

Some medications and medical histories can also matter. Tamoxifen, a medicine used in some breast cancer patients, can slightly increase the risk of endometrial changes, although its benefits may be important and treatment decisions should be individualized. A history of endometrial hyperplasia, especially atypical hyperplasia, can be a precancerous condition that requires close management.

Inherited risk is important for a smaller group of patients. Lynch syndrome, an inherited condition linked to several cancers, increases the risk of endometrial and colorectal cancer. Women with a strong family history of endometrial, colon, ovarian, or related cancers may benefit from genetic counseling and tailored screening or prevention planning.

Diagnosis and Staging

Evaluation usually begins with a discussion of symptoms, menstrual history, menopause status, medications, personal medical history, and family history. A pelvic examination may be performed to check the uterus, cervix, vagina, and nearby tissues. The doctor may also look for other causes of bleeding, including cervical, vaginal, or hormonal conditions.

Transvaginal ultrasound is often used to measure the thickness of the endometrium and look for structural causes such as polyps or fibroids. In women after menopause, a thin endometrial lining can be reassuring in some situations, while a thicker lining may need further testing. Ultrasound findings guide decision-making but do not replace a tissue diagnosis when cancer is suspected.

An endometrial biopsy is the key test for diagnosis. During this procedure, a small sample of the uterine lining is taken and examined by a pathologist. If the sample is insufficient, symptoms continue, or the doctor needs a better view of the uterine cavity, hysteroscopy with dilation and curettage may be recommended. Hysteroscopy uses a thin camera to inspect the inside of the uterus and target abnormal areas.

If cancer is confirmed, staging describes how far it has spread. Imaging tests such as MRI, CT, PET/CT, or chest imaging may be used depending on the case. Final staging often depends on surgical findings and pathology, including how deeply the cancer has grown into the uterine muscle, whether lymph nodes are involved, and whether the cancer has spread beyond the uterus.

Treatment Options

Treatment is planned according to the cancer type, grade, stage, the patient’s age, general health, and personal priorities such as fertility wishes. For many patients, surgery is the main treatment. The usual operation includes removal of the uterus and cervix, called hysterectomy, along with removal of both fallopian tubes and ovaries. In selected cases, lymph node assessment or sentinel lymph node mapping is performed to check whether cancer cells have spread.

Surgery may be performed through open, laparoscopic, or robotic-assisted techniques depending on the patient and the medical center’s expertise. Minimally invasive approaches may support faster recovery for suitable patients, but the safest and most effective approach is individualized. After surgery, the pathology results guide whether additional treatment is recommended.

Radiation therapy may be used after surgery to reduce the risk of recurrence, or as a main treatment when surgery is not possible. It can be delivered externally to the pelvis or internally through vaginal brachytherapy. Chemotherapy may be recommended for higher-risk cancers, advanced stages, or certain tumor types. It works throughout the body to treat cancer cells that may have spread.

Hormone therapy may be an option for selected low-grade, hormone-sensitive cancers, including some patients who are not candidates for surgery or carefully selected younger patients who wish to preserve fertility. Immunotherapy and targeted therapy are increasingly used for advanced or recurrent endometrial cancer based on tumor features such as mismatch repair status or specific molecular markers. The treatment plan should be discussed with a gynecologic oncologist and may involve a multidisciplinary team.

Prevention and Self-Care

Not all cases of endometrial cancer can be prevented, but some risk factors can be reduced. Maintaining a healthy weight is one of the most important modifiable steps, because excess body fat can increase estrogen levels. Regular physical activity, balanced nutrition, and management of diabetes or high blood pressure support overall health and may help reduce risk.

Women who use hormone therapy for menopausal symptoms should discuss the safest option with their doctor. In women who still have a uterus, estrogen is usually balanced with progesterone to protect the endometrium. Decisions about hormone therapy should consider symptoms, age, personal risk factors, and medical history.

People with Lynch syndrome or a strong family history of related cancers should ask about genetic counseling. In high-risk individuals, doctors may discuss earlier evaluation of symptoms, individualized surveillance, or risk-reducing surgery after childbearing is complete. These choices are personal and should be made with careful medical guidance.

Self-care also includes paying attention to bleeding patterns and keeping routine gynecologic care. Tracking menstrual cycles, bleeding volume, and spotting can help doctors understand what has changed. After treatment for endometrial cancer, follow-up visits are important to monitor recovery, manage side effects, and evaluate any new symptoms.

When to See a Doctor

A doctor should be consulted for any vaginal bleeding after menopause, even if it is light or happens only once. Women who have not reached menopause should also seek medical advice for persistent bleeding between periods, unusually heavy bleeding, bleeding after sex, or bleeding that is different from their normal pattern. Most abnormal bleeding is not cancer, but evaluation is the only reliable way to know the cause.

Medical attention is also recommended for pelvic pain, pressure, unexplained anemia, ongoing fatigue related to heavy bleeding, or new discharge that is watery, blood-stained, or persistent. A gynecologist can decide whether ultrasound, biopsy, or other tests are needed. Early evaluation often allows treatment to begin when options are broader and recovery may be easier.

Patients already diagnosed with endometrial cancer should ask about the stage, tumor type, grade, molecular test results, treatment goals, expected side effects, fertility considerations, and follow-up schedule. Clear communication helps patients take part in decisions and understand what to expect. Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals diagnose and treat endometrial cancer for international patients, with care planning based on each patient’s medical needs.

Frequently asked questions

Is bleeding after menopause always a sign of endometrial cancer?

No. Postmenopausal bleeding can be caused by several non-cancerous conditions, including vaginal or endometrial thinning, polyps, or medication effects. However, because endometrial cancer can also cause bleeding after menopause, any bleeding should be evaluated by a qualified doctor.

How is endometrial cancer different from cervical cancer?

Endometrial cancer begins in the lining of the uterus, while cervical cancer begins in the cervix, the lower part of the uterus that opens into the vagina. They have different risk factors, screening methods, and treatments. A Pap test screens mainly for cervical changes, not endometrial cancer.

Can endometrial cancer be found with a Pap smear?

A Pap smear is not designed to screen for endometrial cancer. Sometimes abnormal endometrial cells are seen on a Pap test, but a normal Pap result does not rule out endometrial cancer. Symptoms such as abnormal uterine bleeding usually require direct evaluation of the uterine lining.

What is the main treatment for endometrial cancer?

For many patients, the main treatment is surgery to remove the uterus, cervix, fallopian tubes, and ovaries, sometimes with lymph node assessment. Depending on the stage and tumor features, radiation therapy, chemotherapy, hormone therapy, immunotherapy, or targeted therapy may also be recommended. Treatment is individualized by a gynecologic oncology team.

Can younger women get endometrial cancer?

Yes, although endometrial cancer is more common after menopause, it can occur before menopause. Risk may be higher in women with obesity, polycystic ovary syndrome, long-term irregular ovulation, Lynch syndrome, or endometrial hyperplasia. Persistent abnormal bleeding in younger women should be assessed rather than dismissed.

Is fertility preservation possible with endometrial cancer?

In carefully selected cases, usually involving early-stage, low-grade, hormone-sensitive cancer, fertility-sparing treatment with close monitoring may be considered. This approach is not appropriate for everyone and requires detailed counseling about risks and follow-up. A gynecologic oncologist and fertility specialist should guide the decision.

What follow-up is needed after treatment?

Follow-up usually includes regular visits to review symptoms, perform pelvic examinations when appropriate, and manage treatment effects. The schedule depends on the stage, treatment received, and the patient’s overall health. Patients should report new bleeding, pelvic pain, unexplained weight loss, or persistent changes in bladder or bowel habits.

References

• World Health Organization
• National Cancer Institute
• American Cancer Society
• European Society for Medical Oncology
• American College of Obstetricians and Gynecologists

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.