Ovarian cancer symptoms: what to look for

Ovarian cancer is one of the most challenging cancers to diagnose. Around 80% of cases are diagnosed only after the cancer has spread beyond the ovaries, making earlier recognition especially important.

Yet ovarian cancer is often missing from conversations about women’s health. The persistent myth that it is a "silent killer" can leave people believing there are no warning signs to look out for. In reality, symptoms can occur—but they may be subtle, vague, and easy to dismiss or mistake for something else.

We spoke with Clue’s Science Team to explore how ovarian cancer develops, why there is no universal screening test, and which symptoms are often normalized or ignored.

Key takeaways

• Ovarian cancer can cause symptoms before diagnosis, but they are easily missed: Studies suggest that around 95% of patients experience symptoms before diagnosis

• The most common signs can be mistaken for other conditions: Persistent bloating, pelvic or abdominal pain, feeling full quickly, and urinary changes may be dismissed as IBS, stress, or UTIs

• Frequency and persistence matter: Experiencing these symptoms more than 12 days a month, particularly if they are new and represent a shift from your baseline, is reason to speak with a healthcare provider

• Ovarian cancer is not necessarily a "silent killer": This idea can create a false sense of helplessness. Recognizing subtle changes early can encourage timely medical evaluation

• There is no universal screening test for the general population: Screening methods studied so far have not been shown to reduce deaths from ovarian cancer and can lead to false positives. For now, recognizing potential symptoms remains one of the most important tools available.

How does ovarian cancer manifest in the body, and what are the most common symptoms?

Most ovarian cancers are now thought to begin in the fallopian tubes. As ovarian cancer progresses, cancer cells can spread within the abdomen and pelvis and implant on nearby organs and tissues. This can lead to fluid buildup, abdominal swelling, and masses within the abdomen. 

Because symptoms are often subtle and easily mistaken for gastrointestinal or bladder issues, around 80% of patients are diagnosed after the cancer has already spread beyond the ovaries.

Studies suggest that around 95% of patients experience vague and nonspecific symptoms before diagnosis. 

The most common symptoms include: 

• Persistent bloating

• An increase in abdominal size

• Pelvic or abdominal pain

• Urinary symptoms, such as needing to pee more often or more urgently

• Difficulty eating or feeling full quickly 

Experiencing these symptoms more than 12 days per month, especially if they are new within the past year, increases the odds of having ovarian cancer. 

These symptoms are common and are far more often caused by non-cancerous conditions. This is why their frequency, persistence, and change from a person’s normal baseline are especially important.

Which signs of ovarian cancer do people most commonly normalize without realizing?

The symptoms most often normalized or dismissed are gastrointestinal symptoms such as bloating and abdominal pain. These can be easily attributed to food intolerance or irritable bowel syndrome (IBS). 

Difficulty eating and feeling full quickly are often attributed to stress and aging, while urinary symptoms may be mistaken for a urinary tract infection (UTI) or overactive bladder syndrome. 

Why is there no universal screening test for ovarian cancer? 

There is currently no routine ovarian cancer screening test recommended for people at average risk because the screening methods studied so far have not been shown to reduce deaths from the disease. There are two main reasons for this. First, for screening to work, there needs to be enough time to detect a disease and treat it before symptoms develop or the disease progresses. For the most common type of ovarian cancer, this window is thought to be very short.   Second, ovarian cancer is relatively rare, so screening can produce a high number of false-positive results. These can cause substantial harm, including emotional distress and unnecessary surgery.  

Why is ovarian cancer still under-discussed?

Ovarian cancer has been labeled the "silent killer" for decades. This is based on the belief that symptoms don’t develop until the later stages of the disease. This has largely been disproven, since studies suggest that around 95% of patients have symptoms before diagnosis. 

The idea that the disease is "silent" can create the impression that there is little for people to do about it. This may limit awareness and discourage people from seeking medical assessment when symptoms arise.

The absence of an effective screening test for the general population may also make awareness efforts more difficult because there’s no public health screening program to support them. 

Lastly, the typical symptoms are non-specific, which can make clear and effective public health messaging challenging. But that doesn’t mean we should stop talking about them. If greater awareness helps even one person recognize symptoms and seek medical assessment, it’s worthwhile.