First Time User? Enroll now.
COVID-19: Vaccine information, visitor restrictions, testing, treatment, and additional resources
Home > Health Library > Functional Ovarian Cysts
A functional ovarian cyst is a fluid-filled sac that forms on an ovary. A sac normally forms during ovulation to hold a maturing egg. Usually the sac goes away after the egg is released. But if an egg isn't released, or if the sac closes up after the egg is released, the sac can swell up with fluid.
During the normal monthly menstrual cycle, one of two types of functional cysts may form.
A functional ovarian cyst is caused by slight changes in the way the ovary makes or releases an egg. A cyst may form when a sac on the ovary doesn't release an egg, and the sac swells with fluid. Or the sac may release an egg and then reseal and fill with fluid.
Most functional ovarian cysts don't cause symptoms. The larger the cyst is, the more likely you'll have symptoms. Symptoms include pelvic pain, pain with intercourse, lower belly pain, and changes to your period.
If you see your doctor for pelvic pain or bleeding, you'll be checked for problems that may be causing your symptoms. Your doctor may find an ovarian cyst during a pelvic exam. You may have a pelvic ultrasound to see if the cyst is filled with fluid.
Most functional ovarian cysts go away without treatment. Your doctor may suggest using heat and medicine to relieve minor pain. Surgery can remove a large cyst that bleeds or causes severe pain. Your doctor may suggest that you take birth control pills, which stop ovulation. This may prevent new cysts from forming.
A functional ovarian cyst sometimes develops near the end of the menstrual cycle, when an egg follicle fills up with fluid. Factors that may increase your risk for developing a functional ovarian cyst include:
Functional ovarian cysts usually are harmless and don't cause symptoms. The larger the cyst is, the more likely it is to cause symptoms. Symptoms may include:
There are many other conditions that cause symptoms like those of a functional ovarian cyst. So it's important to have any unusual pelvic symptoms checked and to have a pelvic exam.
Most functional ovarian cysts cause no symptoms and go away after 1 to 2 menstrual periods. Some cysts grow as large as 4 in. (10.2 cm) in diameter before they shrink or rupture. They don't cause ovarian cancer.
Call your doctor now if you have:
Call your doctor for an appointment if:
Most functional ovarian cysts are harmless, don't cause symptoms, and go away without treatment. Watchful waiting is usually okay if you are diagnosed with a functional ovarian cyst.
If you see your doctor for pelvic pain or bleeding, you'll be checked for problems that may be causing your symptoms. Your doctor will ask you about your symptoms and menstrual periods.
Your doctor may find an ovarian cyst during a pelvic exam. You may have a pelvic ultrasound to see if the cyst is filled with fluid.
Your doctor may recommend further testing in some cases, such as when the first ultrasound doesn't clearly show what kind of cyst or growth you have. Or other tests may be done if you have moderate to severe pain or vaginal bleeding.
Image courtesy of Intermountain Medical Imaging, Boise, Idaho.
Figure 1 shows small normal-sized cysts. Figure 2 shows large cysts that affect the ovary and may cause pain.
Most functional ovarian cysts go away without treatment. When treatment is needed, the goals are to:
Home treatment with heat and pain medicine can often relieve symptoms.
Treatment with medicines or surgery may be used for a cyst that doesn't go away, looks odd on an ultrasound, or causes symptoms.
Your doctor may suggest that you try birth control pills for several months. They prevent ovulation. This can stop more cysts from forming.
Surgery to remove the cyst (cystectomy) through a small incision (laparoscopy) may be done. This is done if a painful cyst doesn't go away with treatment. If a cyst looks odd on an ultrasound or if you have other risk factors for ovarian cancer, your doctor may recommend surgery to remove the cyst through a larger belly incision (laparotomy).
Current as of:
November 22, 2021
Author: Healthwise StaffMedical Review: Sarah Marshall MD - Family MedicineKathleen Romito MD - Family MedicineMartin J. Gabica MD - Family MedicineKirtly Jones MD - Obstetrics and Gynecology
Current as of: November 22, 2021
Author: Healthwise Staff
Medical Review:Sarah Marshall MD - Family Medicine & Kathleen Romito MD - Family Medicine & Martin J. Gabica MD - Family Medicine & Kirtly Jones MD - Obstetrics and Gynecology
To learn more about Healthwise, visit Healthwise.org.
© 1995-2022 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.