An ovarian cyst is a sac filled with fluid that forms on or inside an ovary.
This article is about cysts that form during your monthly menstrual cycle, called functional cysts. Functional cysts are not the same as cysts caused by cancer or other diseases. The formation of these cysts is a perfectly normal event and is a sign that the ovaries are working well.
Each month during your menstrual cycle, a follicle (cyst) grows on your ovary. The follicle is where an egg is developing.
Another type of cyst occurs after an egg has been released from a follicle. This is called a corpus luteum cyst. This type of cyst may contain a small amount of blood. This cyst releases progesterone and estrogen hormones.
Ovarian cysts are more common in the childbearing years between puberty and menopause. The condition is less common after menopause.
Taking fertility drugs often causes the development of multiple follicles (cysts) in the ovaries. These cysts most often go away after a woman's period, or after a pregnancy.
Functional ovarian cysts are not the same as ovarian tumors or cysts due to hormone-related conditions such as polycystic ovary syndrome.
Ovarian cysts often cause no symptoms.
An ovarian cyst is more likely to cause pain if it:
Symptoms of ovarian cysts can also include:
Changes in menstrual periods are not common with follicular cysts. These are more common with corpus luteum cysts. Spotting or bleeding may occur with some cysts.
Your health care provider may find a cyst during a pelvic exam, or when you have an ultrasound test for another reason.
Ultrasound may be done to detect a cyst. Your provider may want to check you again in 6 to 8 weeks to make sure it is gone.
Other imaging tests that may be done when needed include:
The following blood tests may be done:
Functional ovarian cysts often do not need treatment. They often go away on their own within 8 to 12 weeks.
If you have frequent ovarian cysts, your provider may prescribe birth control pills (oral contraceptives). These pills may reduce the risk of developing new cysts. Birth control pills do not decrease the size of current cysts.
You may need surgery to remove the cyst or ovary to make sure that it is not ovarian cancer. Surgery is more likely to be needed for:
Types of surgery for ovarian cysts include:
You may need other treatments if you have polycystic ovary syndrome or another disorder that can cause cysts.
Cysts in women who are still having periods are more likely to go away. A complex cyst in a woman who is past menopause has a higher risk of being cancer. Cancer is very unlikely with a simple cyst.
Complications have to do with the condition causing the cysts. Complications can occur with cysts that:
Call your provider if:
Also call your provider if you have had following on most days for at least 2 weeks:
These symptoms may indicate ovarian cancer. Studies which encourage women to seek care for possible ovarian cancer symptoms have not shown any benefit. Unfortunately, we do not have any proven means of screening for ovarian cancer.
If you are not trying to get pregnant and you often get functional cysts, you can prevent them by taking birth control pills. These pills prevent follicles from growing.
Reviewed By: John D. Jacobson, MD, Professor of Obstetrics and Gynecology, Loma Linda University School of Medicine, Loma Linda Center for Fertility, Loma Linda, CA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.