Ovarian Cysts: When They're Normal and When to Get Checked

An ultrasound mentioning an "ovarian cyst" can sound alarming, but the reality is that ovarian cysts are extremely common, and most are a normal part of how the ovaries work each month. This guide explains what's typical, what's worth a closer look, and how cysts are usually managed.

What is an ovarian cyst?

An ovarian cyst is a fluid-filled sac that forms on or inside an ovary. Every menstrual cycle, the ovary grows a small follicle to release an egg; when that process doesn't follow its usual pattern, a fluid-filled sac can form instead. Most cysts are entirely harmless.

Common types of cysts

• Functional cysts — the most common type, formed during the normal ovulation process. These usually resolve on their own within one to three cycles.
• Corpus luteum cysts — form after an egg is released, when the follicle reseals and fills with fluid instead of breaking down normally.
• Dermoid cysts — present from birth and made of different tissue types; usually not related to the menstrual cycle.
• Endometriomas — cysts related to endometriosis, formed when endometrial-like tissue grows on the ovary.

Common ovarian cyst symptoms

Many cysts cause no symptoms at all. When they do, symptoms often depend on the size of the cyst and where it sits. You might notice:

• A dull ache or pressure on one side of your lower belly. It may come and go, or feel worse around ovulation or your period.
• Bloating or a feeling of fullness in your lower abdomen, even when you have not eaten much.
• Pain during sex, especially with deep penetration.
• Changes in your period, such as spotting, a heavier or lighter flow, or a cycle that arrives earlier or later than usual.
• Needing to pee more often, or pressure on your bowel, if a larger cyst presses on nearby organs.
• Lower back or thigh ache that does not have another clear cause.

These signs are common to many other conditions too, from digestive upset to normal ovulation pain. That is why a scan, not symptoms alone, is used to confirm a cyst.

When cysts are usually nothing to worry about

Small, functional cysts often cause no symptoms at all and are found incidentally during a routine ultrasound. Even when they do cause mild symptoms — a dull ache on one side, or slight bloating — most resolve without any treatment within a few menstrual cycles.

When to seek medical attention

• Sudden, sharp, or severe pelvic pain, which could suggest a cyst has ruptured or twisted (ovarian torsion) and needs prompt evaluation.
• Pain accompanied by fever, vomiting, or fainting.
• A cyst that persists, grows, or changes in appearance over several follow-up ultrasounds.
• Cysts appearing after menopause, which are more often evaluated further.
• Irregular bleeding, pelvic pressure, or bloating that doesn't resolve.

If cysts appear alongside irregular cycles, it's also worth discussing PCOS, which can cause many small follicles to remain on the ovaries. Read our PCOS 101 guide here.

How ovarian cysts are diagnosed

Most cysts are found with a pelvic ultrasound. Often this is a transvaginal ultrasound, where a slim probe is placed in the vagina to get a clear view of the ovaries. It is usually quick and not painful. The scan shows the size of the cyst, whether it is filled with simple fluid, and whether it has any solid parts.

Your provider may also suggest a pregnancy test, since early pregnancy can cause a corpus luteum cyst. In some cases, blood tests that check hormones are used, especially if PCOS is being considered. A blood test called CA-125 is sometimes ordered in specific situations, though it can be raised by many harmless conditions too.

For a small, simple cyst, the most common plan is "watchful waiting". This means a repeat ultrasound after a few cycles to make sure it has shrunk or gone. Larger cysts, cysts that do not go away, or cysts causing strong symptoms may be talked about in more detail, and surgery is one option a doctor may discuss.

Ovarian cysts and trying to conceive

If you are trying for a baby, finding a cyst can feel worrying. Here is the reassuring part. Functional cysts are a sign that your ovaries are going through their normal monthly cycle. They usually do not stop you from getting pregnant, and they often fade by themselves.

Some cysts do deserve a closer look when you are trying to conceive. Endometriomas are linked with endometriosis, which can affect fertility. Many small follicles seen together on a scan, along with irregular cycles, can point toward PCOS. In both cases, a provider can help you plan next steps. You can also learn how your monthly cycle works in our guide to cycle phases and your fertile window.

If you have been trying for 12 months (or 6 months if you are 35 or older), it is a good time to talk to a provider, whether or not a cyst has been found.

Ovarian cyst myths vs facts

• Myth: A cyst means something serious. Fact: Most ovarian cysts in people who still have periods are harmless and go away on their own.
• Myth: If you have a cyst, you have PCOS. Fact: PCOS is a hormone condition with several features. A single cyst on its own does not mean you have it.
• Myth: Cysts always cause pain. Fact: Many are found by chance during a routine scan and cause no symptoms at all.
• Myth: Every cyst needs surgery. Fact: Watchful waiting with a follow-up scan is the most common approach for small, simple cysts.

Questions to ask your provider

• What type of cyst do I have, and how big is it?
• Do I need a follow-up ultrasound, and when?
• Which symptoms mean I should call you or seek urgent care?
• Could this cyst affect my plans to get pregnant?

Supporting your ovarian and hormonal health

AGO Tumor and AGO Eva are formulated to help support the health foundation of women managing ovarian cysts or general gynecologic concerns, alongside regular monitoring from a healthcare professional.