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Understanding Ovarian Cysts: What They Are and How They Form

An ovarian cyst is a fluid-filled sac that grows on or inside an ovary. Most ovarian cysts are benign, meaning they are not cancerous. According to the American College of Obstetricians and Gynecologists, ovarian cysts occur in about 8 percent of women during their reproductive years, though the exact number may be higher since many cysts cause no symptoms and go undetected.

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The ovaries are almond-shaped organs located on either side of the uterus. During a woman's menstrual cycle, the ovaries release eggs monthly. Sometimes, a fluid-filled sac forms during this process. Most cysts disappear on their own within a few weeks or months without any treatment. However, some cysts persist, grow larger, or cause discomfort.

There are several types of ovarian cysts. Functional cysts are the most common type and develop as part of the normal menstrual cycle. These include follicle cysts, which form when the sac holding an egg does not rupture, and corpus luteum cysts, which develop from the tissue that remains after an egg is released. Other types include dermoid cysts, which contain tissue like hair or skin, and cystadenomas, which are filled with a mucus-like fluid.

Certain factors increase the risk of developing ovarian cysts. Women who have irregular menstrual periods, use fertility medications, or have endometriosis—a condition where tissue similar to the uterine lining grows outside the uterus—have higher rates of cyst formation. Additionally, women with a family history of ovarian cysts or polycystic ovary syndrome (PCOS) may be more prone to developing them. Age also plays a role, as ovarian cysts are more common in women of reproductive age, typically between ages 20 and 40.

Takeaway: Most ovarian cysts are harmless and resolve without treatment. Understanding what cysts are and how they form helps you recognize that having a cyst does not automatically mean something is wrong or that you need invasive treatment.

Common Symptoms and When to Contact Your Healthcare Provider

Many women with ovarian cysts experience no symptoms at all and discover cysts only during routine imaging scans for other reasons. However, when cysts do cause symptoms, they may include pelvic pain, pressure, or a dull ache on one side of the abdomen or pelvis. This pain might come and go or remain constant, depending on the cyst's size and location. Some women report a sharp pain that occurs suddenly, which can indicate that a cyst has ruptured or twisted.

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Other potential symptoms include bloating, a feeling of fullness even after eating a small amount of food, and discomfort during sexual intercourse. Some women notice changes in their menstrual cycle, such as heavier or lighter periods than usual. Nausea or vomiting can occur, particularly if a cyst has ruptured. Pain or pressure in the lower back or thighs is also reported by some women with larger cysts.

It is important to understand the difference between symptoms that warrant a call to your doctor and those that may require urgent care. Contact your healthcare provider if you experience persistent pelvic pain, pain that interferes with daily activities, or pain accompanied by fever or vaginal discharge. You should also reach out if you notice significant changes in your menstrual cycle or if you have a history of ovarian cysts and develop new or worsening symptoms.

Seek immediate medical attention if you experience severe, sudden pain in the abdomen or pelvis, especially when combined with fever, vomiting, or fainting. These signs can indicate a ruptured cyst or ovarian torsion, a condition where a cyst causes the ovary to twist. While ovarian torsion is rare, affecting about 2 to 3 women per 100,000 per year according to medical literature, it requires prompt treatment to prevent damage to the ovary.

Takeaway: Keep track of any pelvic pain or changes in your menstrual cycle and discuss them with your healthcare provider at your next appointment. Most symptoms are not serious, but your doctor can determine whether imaging or monitoring is needed based on your specific situation.

Diagnostic Methods: How Healthcare Providers Identify Ovarian Cysts

Healthcare providers typically discover ovarian cysts through imaging tests, most commonly transvaginal ultrasound. During a transvaginal ultrasound, a small, wand-like probe is inserted into the vagina to create detailed images of the ovaries. This method provides clearer images than abdominal ultrasound and allows the doctor to assess the cyst's size, shape, and characteristics. The procedure takes about 15 to 30 minutes and is generally painless, though some women may experience mild discomfort.

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Pelvic ultrasound performed over the abdomen is another imaging option, particularly for initial screening. This is the same type of ultrasound used during pregnancy and produces images by bouncing sound waves off the organs. Transabdominal ultrasound may be performed first, followed by transvaginal ultrasound for more detailed information if needed.

In some cases, doctors may order additional imaging such as computed tomography (CT) scans or magnetic resonance imaging (MRI) to gather more information about the cyst, especially if the ultrasound findings are unclear or the cyst has characteristics that warrant further evaluation. These imaging methods provide three-dimensional views and can help distinguish between different types of cysts.

Blood tests may also be part of the diagnostic process. A blood test called CA-125 measures a protein that is sometimes elevated in women with ovarian cancer. However, this protein can also be elevated in women with benign cysts, endometriosis, fibroids, or even during menstruation. Therefore, a single elevated CA-125 result does not indicate cancer. Instead, doctors use this test alongside imaging results and medical history to make treatment decisions.

Takeaway: If your doctor suspects you have an ovarian cyst, transvaginal ultrasound is the most likely imaging test you will have. Understanding what to expect during this procedure and why your doctor might order additional tests helps you feel more prepared for your appointment.

Treatment Options: From Monitoring to Medical Intervention

The treatment approach for ovarian cysts depends on several factors, including the cyst's size, appearance, whether it is causing symptoms, and your age and medical history. For many women, especially those with small cysts that are not causing symptoms, the recommended approach is watchful waiting, also called monitoring. During this period, you may have follow-up ultrasound scans at regular intervals—often 6 to 8 weeks after the initial diagnosis, then again at 3 months—to track whether the cyst grows, shrinks, or disappears. Most functional cysts resolve within 8 to 12 weeks without any treatment.

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For women experiencing pain or discomfort from a cyst, over-the-counter pain relievers such as ibuprofen or naproxen can help manage symptoms. Heat therapy, such as using a heating pad on the abdomen or lower back for 15 to 20 minutes several times a day, may also provide relief. Many women find that rest and reduced physical activity during the most uncomfortable periods help as well.

Hormonal birth control, such as oral contraceptive pills, is sometimes prescribed to prevent new cysts from forming. These medications work by preventing ovulation, which stops the hormonal cycle that can lead to functional cyst development. However, birth control does not cause existing cysts to shrink; it simply helps prevent future ones. Research published in medical journals indicates that birth control reduces the recurrence of functional cysts, though it does not eliminate them entirely.

Surgical intervention becomes necessary in certain situations. If a cyst is very large (typically larger than 10 centimeters), causes persistent pain despite conservative measures, continues to grow on follow-up scans, or has characteristics suggesting it may not be benign, your doctor may recommend surgery. Laparoscopy is a minimally invasive surgical procedure where a thin, lighted tube is inserted through a small incision in the abdomen to visualize and remove the cyst. In some cases, particularly if the cyst is very large or characteristics are concerning, open surgery may be necessary. According to the American College of Obstetricians and Gynecologists, surgery for ben