An ovarian cyst that is growing often announces itself through pressure, bloating, or pain that gets worse over days or weeks rather than staying steady. Most ovarian cysts are benign and many shrink on their own within a few menstrual cycles. The clearest way to know if a cyst is actually growing is not by symptoms alone, but by comparing imaging studies over time — usually a pelvic ultrasound repeated weeks apart. Symptoms can suggest change, but only a repeat scan confirms it.
What Is an Ovarian Cyst, Exactly?
An ovarian cyst is a fluid-filled sac that forms on or inside an ovary. Most develop as part of the normal menstrual cycle.
The most common type is a functional cyst. Each month, an ovary grows a follicle that releases an egg. If that follicle keeps filling with fluid instead of breaking open, it becomes a follicular cyst. If the follicle releases the egg but then seals back up and fills with fluid, it becomes a corpus luteum cyst. These functional cysts are almost always harmless and typically resolve without treatment.
Other types are not tied to the menstrual cycle. Dermoid cysts contain tissue like hair or skin. Endometriomas form when endometrial-like tissue grows on the ovary. Cystadenomas develop from ovarian surface cells and can become large. These types are less likely to disappear on their own.
The distinction matters because how a cyst behaves over time depends heavily on what kind it is. A functional cyst that grows for a few days and then shrinks is following a normal pattern. A cystadenoma that keeps expanding is a different situation entirely.
How To Know If Your Ovarian Cyst Is Growing
The only reliable way to confirm a cyst is growing is to measure it more than once. A single ultrasound gives you a snapshot. Two ultrasounds spaced apart give you a trend.
Doctors typically compare the longest dimension of the cyst across scans. If that measurement increases beyond the margin of measurement error between two studies, the cyst is considered to have grown. Ultrasound measurements can vary slightly depending on the technician, the equipment, and the angle of the probe, so small differences are not always meaningful.
Transvaginal ultrasound is the standard imaging method for the ovaries. It provides clearer detail than a transabdominal scan, especially for smaller cysts. In some cases a doctor may order an MRI for a more detailed look, particularly if the ultrasound findings are unclear.
Blood tests can add context. A CA-125 test measures a protein that can be elevated in ovarian cancer, but it is also elevated by many benign conditions like endometriosis, fibroids, and even normal menstruation. CA-125 is not a screening test for ovarian cancer in the general population and is not used alone to determine whether a cyst is growing or dangerous. It is one piece of a larger picture.
What Symptoms Suggest a Cyst Is Getting Bigger?
Symptoms are a signal, not proof. A growing cyst can press on nearby organs and produce noticeable changes, but the same symptoms can come from many other causes.
Common signs that a cyst may be enlarging include:
- Pelvic pain or a dull ache that becomes more persistent or intense
- Bloating or a feeling of fullness in the lower abdomen
- Pressure on the bladder causing frequent urination
- Pressure on the rectum causing difficulty with bowel movements
- Pain during intercourse
- A visible change in abdominal size, though this usually requires a fairly large cyst
The pattern of symptoms matters. Pain that steadily worsens over days or weeks is more concerning than a brief twinge. A cyst that twists on its stalk — a condition called ovarian torsion — causes sudden, severe pain, often with nausea and vomiting. Torsion is a medical emergency because it can cut off blood flow to the ovary. If that happens, seek care immediately.
Rupture is another possibility. A cyst that bursts can cause sharp, sudden pain and sometimes internal bleeding. Smaller ruptures often resolve on their own. Larger ones may need medical attention.
One important point: many growing cysts cause no symptoms at all. Size and symptoms do not always track together. A person can have a large cyst and feel fine, or a small one and feel significant pain. This is one reason imaging, not symptoms alone, guides decisions.
When Should You See a Doctor?
See a doctor if you have pelvic pain that is new, worsening, or lasting more than a few days. Seek urgent care for sudden severe pain, pain with fever, heavy vaginal bleeding, or signs of shock like dizziness and rapid heartbeat.
If you have already been diagnosed with a cyst, your doctor will likely recommend a follow-up scan. The timing depends on the cyst’s size, appearance, and your age. Postmenopausal women are followed more closely because the risk of ovarian cancer rises after menopause. Premenopausal women with simple, small cysts are often rechecked after a few menstrual cycles, since many resolve by then.
Regular pelvic exams and imaging are the tools that catch changes. There is no blood test or home method that reliably tells you whether a cyst is growing.
What Does It Mean If a Cyst Is Growing?
A growing cyst is not automatically a serious problem. Context determines what it means.
A functional cyst that grows for a short time and then shrinks is following a normal course. Many grow to a few centimeters before resolving. A cyst that continues to enlarge over multiple scans, or one with features that look complex on imaging — such as thick walls, solid areas, or internal partitions called septations — raises more concern and may prompt further testing or surgery.
The risk of a cyst being cancerous depends heavily on age. Ovarian cancer is uncommon in premenopausal women. The risk increases after menopause, which is why the same cyst finding is often managed differently in a 30-year-old than in a 60-year-old.
Most ovarian cysts — the large majority — are benign. The goal of monitoring is to identify the small number that are not, and to relieve symptoms when a cyst is causing them.
A non-obvious point: the word “growth” in a scan report can mean different things. It might mean the cyst got bigger, or it might mean new tissue appeared inside it. These are not the same finding, and they carry different implications. If you are unsure what your report means, ask your doctor to explain the specific wording.
How Are Growing Cysts Managed?
Management depends on size, appearance, symptoms, and whether you are pre- or postmenopausal.
Watchful waiting is common for small, simple cysts, especially in premenopausal women. This means repeat imaging to see whether the cyst changes. Many resolve without any treatment.
Hormonal birth control is sometimes prescribed, though the evidence that it shrinks existing cysts is limited. It may help prevent new functional cysts from forming, but it does not reliably treat cysts that are already there. This is a case where common practice and strong evidence do not fully align.
Surgery may be recommended if a cyst is large, keeps growing, looks complex on imaging, causes significant pain, or is suspicious for cancer. The type of surgery depends on the situation. Some cysts can be removed while preserving the ovary. Others may require removal of the ovary itself. In cases where cancer is suspected, a surgeon with gynecologic oncology training should be involved.
If you are postmenopausal, or if you have a family history of ovarian or breast cancer, your doctor may recommend more frequent monitoring or genetic counseling. These factors change the risk calculation.
Can You Prevent an Ovarian Cyst From Growing?
There is no proven way to stop a functional cyst from growing or to prevent one from forming. These cysts are tied to normal ovulation, and ovulation cannot be selectively turned off without medication.
Hormonal contraceptives prevent ovulation and may reduce the formation of new functional cysts. They do not shrink cysts that already exist. This is an important distinction that is often misunderstood.
Lifestyle changes, diets, and supplements marketed for “cyst support” have no clinical evidence behind them. No study has confirmed that any supplement shrinks ovarian cysts or prevents them from growing. Be cautious of products making those claims.
What does help is appropriate follow-up. Keeping recommended imaging appointments is the most reliable way to catch a cyst that is changing.
Frequently Asked Questions
Can an ovarian cyst grow without symptoms?
Yes. Many cysts enlarge without causing any noticeable symptoms, which is why follow-up imaging matters even when you feel fine. Size and symptoms do not always correlate.
How fast can an ovarian cyst grow?
Growth rates vary widely depending on the type of cyst. Functional cysts often change over the course of a single menstrual cycle, while other types may grow more slowly over months. Only repeat imaging can show the actual rate for your cyst.
Does a growing ovarian cyst mean cancer?
No. Most growing cysts are benign, especially in premenopausal women. Complex features on imaging and postmenopausal status raise concern, but growth alone does not mean cancer.
How often should an ovarian cyst be checked?
Follow-up timing depends on the cyst’s size, appearance, and your age, so there is no single schedule that fits everyone. Your doctor will set an interval based on your specific findings.
