Silent Ovarian Cysts: When You Have No Symptoms at All

Most ovarian cysts cause no symptoms at all. They are usually found by accident, on a scan ordered for something else. Having no symptoms is normal, and on its own it is neither reassuring nor worrying: what a cyst is doing is judged on the ultrasound, not on how you feel.

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How common is it to have an ovarian cyst and not know?

Very common. Ovarian cysts are among the most frequent incidental findings in women's imaging, and the majority produce no symptoms whatsoever. The Society of Radiologists in Ultrasound consensus update, published in Radiology in 2019, reported that cysts were seen in around 14 per cent of first ultrasound examinations in a large series of postmenopausal women, and that many of these were transient: roughly a third had gone by the one year scan.

In women who are still having periods the figure is higher, because the ovary makes and clears fluid filled sacs as part of ordinary cycling. Most of what turns up is a functional cyst (a sac formed by the normal work of the menstrual cycle, which usually clears on its own). So yes, you can have an ovarian cyst and never know. Most women who have one do not.

Why silent ovarian cysts get found

A silent cyst is not found because something drew attention to it. It is found because a scan happened. That route matters, because it explains why cysts turn up far more often in some groups of women than in others.

Routine and unrelated scans

A pelvic or transvaginal ultrasound (a scan taken with a slim probe placed in the vagina, which gives a closer view of the ovaries than a scan through the abdomen) is ordered for many reasons that have nothing to do with the ovaries: heavy or irregular bleeding, urinary symptoms, abdominal imaging, or a scan in early pregnancy. Any of these can show a cyst that was never causing trouble. If you do have pain and want to understand it, that is a different question, covered in our guide to sharp pelvic pain on one side.

Pre-conception, IVF baseline and follicular monitoring scans

Fertility patients are scanned far more often than the general population, and that is the single biggest reason silent cysts turn up in this group. A woman planning a pregnancy may have a pre-conception pelvic scan. A woman in treatment will have a baseline scan (the scan done at the start of a cycle, before any stimulation medication begins). Then follicular monitoring scans every few days as the follicles grow. Over one year of trying, that can be twenty or more looks at the same pair of ovaries.

Please read that frequency correctly. Being scanned more often does not mean your ovaries are more prone to cysts, or that you are at higher risk. It means you are being looked at more, so more of what was always there gets seen. A woman with the same ovaries and no fertility treatment would simply never have known. This is a detection effect, not a disease effect, and confusing the two causes a great deal of unnecessary worry.

Does having no symptoms mean the ovarian cyst is harmless?

No. It does not tell you that.

Most ovarian cysts are harmless. That is true, and it is worth knowing. But the absence of symptoms is not the reason it is true, and it is not evidence in your individual case. Cysts that are entirely benign and cysts that need attention can both be completely silent. Symptoms are not a screening test, and they were never designed to work as one.

This matters more than it sounds. A great deal of patient-facing writing says that most cysts are harmless and cause no symptoms, which quietly runs together two different claims: that most cysts are harmless, and that having no symptoms indicates a cyst is harmless. The first is accurate. The second is not, and acting on it is how women end up skipping a repeat scan that was actually asked for.

What decides the answer is the appearance of the cyst on the ultrasound, its size, and whether you have been through the menopause. Not how you feel.

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What actually decides whether a silent ovarian cyst needs anything doing

Three inputs do most of the work. None of them is a symptom.

Simple or complex appearance on the scan

This is the most important of the three. A simple cyst is thin-walled and contains only fluid, with nothing solid inside it. Simple cysts are overwhelmingly benign. A complex cyst contains something else: septations (thin dividing walls running across the inside of the cyst), solid areas, or internal structure. Complex does not mean cancer, and it should not be read that way. It means the cyst cannot be judged on appearance alone and needs a closer look. If your report uses that word, go through it with your treating team.

Size

Size is one input, not a rule. It is tempting to look for a number separating safe from unsafe, and plenty are quoted, but no single threshold decides anything on its own. A large simple cyst and a small complex one are not ranked the same way, and the same measurement means different things before and after the menopause. Where numbers appear in guidance, they act as prompts to look again, not verdicts. Treat any figure you read online, including those in the table below, as orientation rather than a statement about your scan.

Whether you have been through the menopause

This changed recently, and the change is in your favour. In December 2025, RCOG Green-top Guideline No. 34 was amended in line with a consensus statement issued on behalf of the Royal College of Obstetricians and Gynaecologists and the Royal College of Radiologists, supported by the British Gynaecological Cancer Society and the British Society of Urogenital Radiology. The amended position is that in postmenopausal women, a unilateral (on one side only), unilocular (a single chamber with no dividing walls) simple ovarian cyst measuring 3 cm or less does not require routine follow-up.

Before this amendment, many women in that group were called back for repeat scans for years, and UK ultrasound practice standards have since been updated to match. If you are postmenopausal, have been told your cyst is simple and small, and are bracing yourself for years of monitoring, raise this at your next appointment.

What usually happens next with a silent ovarian cyst

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Scenario	Typical appearance	Usual approach	What Cloudnine Fertility would discuss with you
Premenopausal, simple cyst under 50 mm	Thin-walled, fluid only	Usually physiological. Commonly resolves within two to three cycles. Often no routine follow-up scan needed.	Whether to rescan before starting fertility treatment
Premenopausal, simple cyst 50 to 70 mm	Thin-walled, fluid only	Repeat imaging, typically yearly follow-up.	Timing around a planned IVF cycle
Premenopausal, simple cyst over 70 mm	Thin-walled, fluid only	Further imaging such as MRI, or surgical assessment considered.	Fertility sparing surgical options
Premenopausal, complex features	Septations, solid areas, internal structure	Risk scored, specialist assessment.	Whether this is an endometrioma and what it means for ovarian reserve
Postmenopausal, one sided single chamber simple cyst 3 cm or less	Thin walled, fluid only, unilateral, unilocular	No routine follow-up required. RCOG and RCR consensus, December 2025.	Reassurance. Not applicable to fertility patients.
Any age, cyst found at an IVF baseline scan	Variable	May postpone stimulation. Monitored or aspirated depending on type.	Cycle timing and whether to proceed this month

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What follow up looks like when you have no symptoms

For most women, follow up is a repeat scan and nothing more. Its purpose is not to watch for symptoms appearing. It is to see whether the cyst has gone, stayed the same or changed, because behaviour over time is far more informative than a single image.

Timing is deliberately left flexible in guidance, because it depends on what was seen. A functional cyst is often rechecked after a couple of cycles, on the expectation it will simply have cleared. A persistent simple cyst may be reviewed over a longer interval. Anything with complex features is assessed rather than merely rescanned, and that is a specialist job.

Being asked back is routine and is not a signal of concern. Equally, feeling well in the meantime is not a reason to skip it. Waiting to feel something before repeating a scan is using the wrong signal entirely.

Does a silent ovarian cyst affect fertility or IVF?

Most do not. A functional cyst that comes and goes with your cycle has no bearing on your chances of conceiving, and the same is true of the small simple cysts that turn up incidentally on a pre-conception scan. If you are trying to conceive and want to understand what your body is already telling you, our guide to the physical signs that you are fertile is a better place to start than worrying about an incidental finding.

There are two exceptions worth naming. An endometrioma (a cyst formed by endometriosis tissue on the ovary) is associated with a condition that can affect fertility in its own right, and decisions about whether to operate on one before treatment involve a real trade-off with ovarian reserve (the number of eggs remaining in the ovaries). A large or persistent cyst can also complicate an IVF cycle: a cyst seen on the baseline scan sometimes means stimulation is postponed by a cycle, or that the cyst is monitored or drained first. That is a scheduling decision, not a verdict on your prospects, and it is one your fertility team will talk through with you.

If a cyst has been found during a fertility assessment, the useful question is not whether it is dangerous, but whether it changes the plan for this cycle. Usually it does not.

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When to seek care even though you feel fine

A silent cyst can, occasionally, stop being silent. These are escalation triggers, not a checklist for deciding whether you have a cyst. Seek urgent care if you develop:

Sudden severe pain on one side of the pelvis

Fever or vomiting alongside pelvic pain

Fainting

Persistent bloating, appetite change or unexplained weight loss lasting several weeks

The first three can occur with complications such as ovarian torsion (where the ovary twists and its blood supply is cut off) or a cyst rupturing, both needing same-day assessment. The fourth is a different kind of signal: it warrants a doctor's review rather than emergency care, but should not be sat on for months.

None of this means you should seek a scan you have not been offered. Scanning with no clinical reason is not a screening test for ovarian cysts and is not recommended. It finds cysts that would never have caused trouble and starts follow-up that was never needed.

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