Ovarian Cancer Symptoms vs Endometriosis - How to Tell Them Apart

Ovarian cancer symptoms vs endometriosis at a glance

When comparing ovarian cancer symptoms vs endometriosis, both can cause pelvic or abdominal pain and bloating. Pain linked to the menstrual cycle and bloating that comes and goes can suggest endometriosis. Persistent, worsening bloating, early fullness, and constant, dull pain can raise concern for ovarian cancer. These patterns are clues, not a way to diagnose either condition.

Ovarian cancer presents an immediate threat to life, while endometriosis can threaten quality of life over decades. Distinguishing them requires looking at symptoms, how they change over time, age, family history, and diagnostic findings.

Symptom patterns that help tell them apart

Symptoms of endometriosis can include:

• Painful periods.
• Pain during sex.
• Chronic pelvic pain.
• Bloating and pain after eating.
• Fatigue.
• Infertility.

Symptoms of ovarian cancer can include:

• Bloating.
• Pelvic pain or pressure.
• Abdominal pain that is initially vague.
• Difficulty eating or feeling full quickly.
• Urinary urgency or frequency.

Pain and its relationship to the menstrual cycle

Both conditions can cause pelvic and abdominal discomfort. Endometriosis-related pain often follows a cyclical pattern around the menstrual cycle, while ovarian cancer pain tends to be more constant and dull.

Endometriosis pain can also be variable or chronic, so pain outside your period does not settle the distinction. Painful periods and pain during sex are useful parts of the symptom history, alongside where the pain occurs and whether it changes throughout the month.

Bloating, digestive symptoms, appetite, and urination

Endometriosis-related bloating may come and go. It is often related to intestinal gas from inflammation and associated conditions such as small intestinal bacterial overgrowth (SIBO). Pain after eating can accompany it.

Ovarian cancer can cause bloating from gas and the accumulation of fluid called ascites. This bloating typically worsens rather than fluctuates, and it can become pronounced and unremitting. Feeling full quickly, difficulty eating, pelvic pressure, and urinary urgency or frequency are also part of the ovarian cancer symptom pattern.

How symptoms change over time

Endometriosis typically develops gradually over years. Ovarian cancer symptoms may appear more suddenly over weeks to months, although the initial abdominal discomfort can be vague.

The distinction is about the pattern as well as the symptom itself. Bloating that fluctuates with the menstrual cycle is different from steadily increasing abdominal fullness, but neither pattern alone confirms or excludes a diagnosis.

How the conditions are evaluated

What symptoms, scans, and blood tests can show

Symptoms, blood tests, and scans can suggest endometriosis or ovarian cancer and help guide the evaluation. They do not, however, confirm either diagnosis. Because symptoms overlap, ovarian cancer can be mistaken for endometriosis when symptoms are assumed to have one explanation without establishing the diagnosis.

Ovarian cancer begins in the ovaries or fallopian tubes and is difficult to detect in its early, more curable stages. A symptom checklist alone cannot reliably distinguish it from endometriosis.

Many other conditions can cause similar symptoms. A brief stomach illness with bloating, nausea, and painful diarrhea typically passes within a few days to a week. Symptoms that continue beyond that are a reason to investigate other explanations rather than assume the same short-lived illness.

What confirms a diagnosis

Surgery is the only way to determine accurately whether endometriosis is present. Ovarian cancer requires biopsy confirmation, usually during surgery.

A useful discussion with your doctor separates what is suspected from what has been confirmed. Questions to ask include:

• What do my symptoms and test findings suggest, and what has actually been confirmed?
• Which other conditions remain possible?
• What would be needed to establish the diagnosis?

If you’d like a second opinion on your imaging or a recommended treatment, our team can review it.

Risk, family history, and the possibility of both conditions

Age and family history

Endometriosis is typically diagnosed during the reproductive years, while the most common type of ovarian cancer is usually found in women over 50. These are not absolute dividing lines. Endometriosis can persist into menopause, and symptoms can even begin after menopause.

A family history of ovarian cancer increases risk, and there are genetic links that can be tested for. Endometriosis also runs in families, although it does not have a clear inherited genetic link in the same way. Expert specialist opinion, and possibly genetic testing, can help clarify your individual risk.

Relative risk, absolute risk, and overlap

Ovarian cancer is relatively uncommon, with approximately 20,000 new cases annually in the United States and a lifetime risk of about 1 in 78. In women with endometriosis, the risk of developing ovarian cancer is elevated by 1.5- to 3-fold.

That relative increase is concerning, but the absolute proportion affected remains small. Even a small percentage across millions of women, however, can represent thousands or tens of thousands of people. Endometriosis and ovarian cancer can also be present at the same time, so an endometriosis diagnosis does not rule out ovarian cancer.

A 2019 focused review of genetic findings in endometriosis and ovarian cancer tissue described shared mutations that suggest a possible genetic link, particularly with clear cell and endometrioid ovarian cancers. The underlying mechanisms were not well understood. These tissue findings are different from an inherited family risk and do not mean that endometriosis will become cancer.

Work is underway to identify gene-driven biomarkers that could enable more accurate diagnosis. For an individual risk assessment now, your age, symptoms, family history, and test findings remain part of the specialist discussion.

Choosing the right specialist

An expert opinion can be critical to finding the right path for diagnosis and treatment. In most cases, a general gynecologist can guide the initial evaluation and point you toward the appropriate specialist.

If your concerns remain unaddressed and endometriosis seems most likely, an endometriosis specialist may be the best next step. If both endometriosis and ovarian cancer are concerns because of your symptoms, age, or family history, a gynecologic oncologist may be more appropriate or provide an additional opinion.

Few gynecologic oncologists truly specialize in both endometriosis and ovarian cancer. When choosing a specialist, ask about their experience evaluating both conditions and whether another specialist’s input would help clarify your diagnosis or treatment options.