Ovarian cancer: Why can it be so difficult to detect early?

What is ovarian cancer?

Ovarian cancer is a cancer that starts in or near the ovaries, fallopian tubes, or peritoneum, the tissue lining the abdomen. It includes several types of cancer, and their behaviour can vary.

The ovaries are located deep in the pelvis. This means early changes may not cause obvious symptoms, and small tumours may be difficult to detect during a routine physical examination.

Symptoms can be vague or easy to explain away

One of the main reasons ovarian cancer is diagnosed late is that its symptoms are often not specific to cancer. They may resemble common conditions such as irritable bowel syndrome, indigestion, urinary infections, constipation, menopause-related changes, or menstrual problems.

Symptoms may include:

• persistent bloating or abdominal swelling
• pelvic or abdominal pain
• feeling full quickly or loss of appetite
• needing to urinate more often or more urgently
• changes in bowel habits
• unexplained tiredness or weight changes

These symptoms can come and go. They may also feel mild at first, which can make it harder to know when to seek medical advice. For many people, the issue is not one dramatic warning sign but a pattern that does not feel normal and does not go away.

There is no reliable routine screening test

Unlike cervical cancer, ovarian cancer does not currently have a reliable screening test for people at average risk who do not have symptoms.

Tests such as CA-125 blood testing and ultrasound can be useful when symptoms are present or when ovarian cancer is suspected. However, they are not accurate enough to be used as routine screening for everyone. CA-125 can be raised for reasons other than cancer, including endometriosis, fibroids, infections, menstruation, or other inflammatory conditions. It can also be normal in some people with ovarian cancer, especially at earlier stages.

This creates a difficult gap. Doctors need to investigate symptoms carefully, but testing everyone without symptoms would lead to many false alarms, unnecessary procedures, and anxiety, without clear evidence that it saves lives in the general population.

The cancer may grow before it causes clear problems

Ovarian cancer may not cause noticeable symptoms until it has grown or spread within the abdomen. Because the abdomen has space to accommodate changes, early disease may not immediately affect daily life.

Some types of ovarian cancer also appear to begin in the fallopian tubes before spreading to the ovaries or abdominal cavity. This can make early detection even more complex because the disease may not start as a clearly visible ovarian mass.

By the time symptoms become persistent or disruptive, the cancer may already be more advanced. This is one reason ovarian cancer is often described as difficult to diagnose early, rather than simply "silent".

Delays can happen at several stages

Late diagnosis does not usually have one single cause. Delays can happen at different points, including:

• the person noticing symptoms but assuming they are digestive, hormonal, or stress-related
• symptoms being intermittent or not clearly alarming
• difficulty getting an appointment or follow-up
• symptoms being treated first as a more common condition
• normal or unclear early test results
• referral delays between primary care, imaging, and specialist care

This matters because blaming patients for “waiting too long” is unfair. Ovarian cancer symptoms can be genuinely difficult to interpret, and healthcare systems do not always make timely investigation easy.

When should persistent symptoms be checked?

Symptoms such as bloating, pelvic or abdominal pain, feeling full quickly, or urinary changes should be discussed with a healthcare professional if they are new, persistent, frequent, or unusual for the person.

This is especially important if symptoms happen many times in a month, get worse, or do not improve with usual care. Most of the time, these symptoms are not caused by ovarian cancer. But when they persist, they deserve attention.

People with a family history of ovarian, breast, fallopian tube, or related cancers may also need specific advice about inherited risk, including BRCA1 and BRCA2 gene changes or Lynch syndrome.

FAQ

Is ovarian cancer always silent?

No. Many people do have symptoms, but they can be subtle or mistaken for more common conditions.

Can a smear test detect ovarian cancer?

No. A cervical smear, or Pap test, screens for cervical cancer. It does not detect ovarian cancer.

Can CA-125 diagnose ovarian cancer?

CA-125 can support investigation, but it cannot diagnose ovarian cancer on its own. It may be raised for many non-cancer reasons and may be normal in some cases.

Who is at higher risk of ovarian cancer?

Risk may be higher with age, certain inherited gene changes such as BRCA1 or BRCA2, Lynch syndrome, and a family history of ovarian or breast cancer.

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Take care!