Ovarian Cysts: When to Monitor and When to Act
A Diagnosis That Sounds Scarier Than It Usually Is
Few phrases unsettle a patient faster than "you have a cyst on your ovary." I understand why — the word itself feels alarming. But in over two decades of practice, I can tell you that the vast majority of ovarian cysts I see are simple, functional, and resolve entirely on their own. Ovaries form small fluid-filled sacs as a normal part of the menstrual cycle almost every month. Most women never even know it happened.
The goal of this piece isn't to dismiss your concern — it's to help you understand what a cyst actually is, why most need nothing more than patience, and which features tell your doctor it's worth a closer look.
What Exactly Is an Ovarian Cyst?
An ovarian cyst is simply a fluid-filled structure that forms in or on the ovary. There are several broad categories, and knowing the type matters far more than knowing the diagnosis exists at all.
Functional cysts are the most common by far. They form when a follicle — the small sac that houses a developing egg — either doesn't release the egg as expected or doesn't reabsorb after ovulation the way it normally would. These are a byproduct of a perfectly healthy, working reproductive system, and they typically shrink and disappear within a few cycles without any treatment.
Other types include dermoid cysts, which are present from birth and grow slowly over years; endometriomas, which form when endometrial-like tissue implants on the ovary; and cystadenomas, which develop from the outer ovarian surface. Each behaves differently, which is exactly why a scan and a clinical eye matter more than the label "cyst" on its own.
The Diagram Every Patient Should See
When I explain this in clinic, I draw a simple picture, because it makes the distinction click far faster than words alone. Picture the ovary in cross-section: a functional cyst is a smooth, thin-walled, single fluid-filled pocket — clean and simple on ultrasound. A cyst that needs closer attention tends to show different features on the same scan — thicker walls, internal septations (thin dividing walls inside the cyst), solid components mixed with fluid, or increased blood flow on Doppler imaging. None of these features alone confirm anything worrying, but together they tell us to look more carefully and follow up sooner rather than later.
This is precisely why ultrasound remains the first and most important tool. It doesn't just tell us a cyst is there — it describes its architecture, and that architecture guides everything that follows.
Signs Worth Noticing
Most functional cysts cause no symptoms at all and are found incidentally during a routine scan. When symptoms do appear, they're worth mentioning to your gynaecologist rather than waiting out:
Persistent pelvic pain or pressure on one side that doesn't resolve with your cycle. Bloating or a feeling of fullness that doesn't match your usual pattern. Pain during intercourse that is new or worsening. Irregular bleeding or spotting between periods. Sudden, sharp pain, especially with nausea or fever — this warrants urgent evaluation, as it can occasionally signal a cyst has twisted (ovarian torsion) or ruptured.
None of these symptoms automatically means something serious. But they're your body's way of asking for a scan, and a scan is a simple, painless way to get an answer.
Monitor or Act — How We Decide
This is the question every patient really wants answered, and the honest response is: it depends on the cyst's size, appearance, your age, your symptoms, and how it changes over time.
For a simple, small, thin-walled cyst in a woman still menstruating, the standard approach is watchful waiting — typically a repeat ultrasound after a couple of cycles to confirm it has resolved on its own, which the majority do. No medication is needed to "cure" a functional cyst; hormonal contraception may sometimes be used to reduce the chance of new ones forming, but it doesn't shrink an existing one.
Closer monitoring or intervention is considered when a cyst is large, persists or grows across repeat scans, has complex features on ultrasound, causes ongoing pain, or occurs after menopause — postmenopausal ovaries shouldn't be forming new functional cysts, so any cyst here is evaluated more carefully regardless of size. In these situations, additional tests such as blood markers or an MRI may be added, and if needed, a minimally invasive laparoscopic procedure can remove the cyst while preserving healthy ovarian tissue.
The important thing to hold onto is that "needs monitoring" and "needs surgery" are two very different pathways, and the vast majority of women I see stay comfortably in the first one.
You Are Not Alone in the Waiting
I know that "let's watch it and repeat the scan in a few weeks" can feel unsatisfying when you want a definite answer today. But this measured approach exists precisely because it's the safest and most evidence-based way to avoid unnecessary intervention on something your body may well resolve on its own.
At The Green Nest, every scan is reviewed personally, and every plan — whether it's watchful waiting or a next step — is explained clearly so you understand exactly why we've chosen it. Continuity of care means you're not passed between different providers reading your reports in isolation; the same eyes follow your case from the first scan to the last.
If you've been told you have a cyst, or if you're noticing symptoms that concern you, don't sit with the worry alone. A conversation and a scan can usually bring more clarity than the word "cyst" ever will on its own.
This article is for educational purposes and is not a substitute for personalised medical advice. If you have questions about an ovarian cyst or any gynaecological symptom, we invite you to book a consultation with Dr. Shilpi Srivastava at The Green Nest.