Understanding Ovarian Cysts: A Health Information Guide

What Are Ovarian Cysts and How Common Are They?

Ovarian cysts are fluid-filled sacs that develop on or inside the ovaries. The ovaries are small, almond-shaped organs that produce eggs and hormones in people with female reproductive systems. Cysts form when fluid accumulates in a sac-like structure, and they vary greatly in size—ranging from smaller than a pea to larger than an orange.

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Ovarian cysts are remarkably common. Research shows that about 8% of women in their reproductive years develop ovarian cysts at some point. The number increases significantly when using ultrasound imaging; some studies indicate that up to 30% of women have at least one cyst visible on ultrasound, though many cause no symptoms or problems. Most cysts are benign, meaning they are not cancerous and do not pose a serious health threat.

Several factors influence cyst development. Age plays a role, with cysts occurring most often in women between ages 20 and 50. Hormonal changes related to the menstrual cycle drive the formation of many cysts. Some medications, particularly those used for fertility treatment, increase the likelihood of cyst development. Polycystic ovary syndrome (PCOS), a condition affecting hormone levels, creates multiple small cysts on the ovaries.

The distinction between different cyst types matters for understanding potential concerns. Functional cysts develop as part of the normal menstrual cycle and usually disappear on their own within a few weeks or months. Pathological cysts, by contrast, form abnormally and do not follow typical menstrual patterns. These include dermoid cysts (containing tissue like hair or skin cells) and cystadenomas (growths from ovarian tissue cells).

Practical takeaway: Understanding that ovarian cysts are common and often harmless can reduce unnecessary worry. However, monitoring cysts through imaging and medical consultation remains important, particularly when cysts are large or cause symptoms.

Recognizing Symptoms and When to Seek Medical Evaluation

Many people with ovarian cysts experience no symptoms at all. The cyst may only be discovered during a routine pelvic exam or imaging performed for another reason. This silent presentation is actually quite common—many cysts are found incidentally when ultrasounds are performed to investigate unrelated concerns.

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When symptoms do occur, they tend to fall into several categories. Pelvic pain or discomfort is the most frequently reported symptom. This pain may be dull and aching, or sharp and sudden, depending on the cyst type and size. Pain often occurs on one side of the lower abdomen, corresponding to the ovary containing the cyst. Some people describe the sensation as pressure or heaviness in the pelvic area. The pain may worsen during menstruation, during sexual intercourse, or when sitting in certain positions for extended periods.

Other symptoms can include bloating or abdominal swelling, particularly if the cyst is large. Some people report feeling full quickly when eating, even with small meals. Irregular menstrual periods sometimes occur, including heavier bleeding, lighter bleeding, or bleeding at unexpected times. Nausea or vomiting may develop, especially if a cyst twists or ruptures. Some individuals experience pain in the lower back or thighs.

Seeking medical evaluation becomes important in several situations. If you experience sudden, severe pelvic pain—particularly when accompanied by fever or vaginal bleeding—medical attention should not be delayed. If pelvic pain persists for more than a few weeks, or if it interferes with daily activities or sleep, scheduling a medical appointment is advisable. Any significant change in menstrual patterns warrants evaluation. If you have a family history of ovarian cancer, your healthcare provider may recommend more frequent monitoring. Additionally, if a previously known cyst grows larger on follow-up imaging, your doctor should reassess it.

Practical takeaway: Not all ovarian cysts cause symptoms, but persistent pelvic pain, significant bloating, or changes in your menstrual cycle merit a conversation with your healthcare provider. Keeping track of when symptoms occur and what activities trigger them provides valuable information for your medical evaluation.

Types of Ovarian Cysts: Understanding the Differences

Ovarian cysts fall into two primary categories: functional cysts and nonfunctional (pathological) cysts. This distinction matters because it affects how doctors monitor cysts and whether treatment becomes necessary.

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Functional cysts develop during normal ovulation and are by far the most common type. The ovaries produce follicles—small sacs containing eggs—each month. Normally, a follicle releases an egg, then shrinks and disappears. Sometimes, however, the follicle continues growing instead. This creates a follicular cyst, which typically ranges from 2 to 3 centimeters but may grow larger. Follicular cysts usually cause no symptoms and disappear within one to three menstrual cycles. Another type of functional cyst is a corpus luteum cyst. After ovulation, the empty follicle transforms into a structure called the corpus luteum, which produces progesterone. If this structure fills with fluid, a corpus luteum cyst forms. These cysts may persist longer than follicular cysts—sometimes for several weeks—and may cause more noticeable pain, particularly around the time of the next menstrual period.

Nonfunctional cysts develop abnormally and do not relate directly to ovulation. Dermoid cysts, also called mature teratomas, contain various types of tissue such as hair, teeth, or skin cells. These cysts are almost always benign, though they do not disappear on their own and typically require surgical removal if they become large or problematic. Cystadenomas are growths from ovarian tissue cells. They develop gradually and are usually benign, though they rarely may become cancerous. Endometriomas form when tissue similar to the uterine lining grows on the ovary. These cysts often cause pain and are associated with a condition called endometriosis. Polycystic ovaries present a different pattern—multiple small cysts develop on both ovaries, typically related to hormonal imbalances in PCOS.

Healthcare providers use several characteristics to evaluate which type of cyst is present. Size matters; larger cysts require closer monitoring. The cyst's appearance on ultrasound provides clues about its type and whether it contains only fluid or mixed contents. The person's symptoms, age, and medical history all inform the assessment. Whether the cyst appears on one ovary or both ovaries may suggest different causes.

Practical takeaway: Learning whether your cyst is functional (likely to resolve without treatment) or nonfunctional (may require monitoring or treatment) helps you understand what to expect. Ask your healthcare provider which type of cyst you have and what monitoring schedule they recommend.

Diagnosis: How Doctors Identify and Evaluate Ovarian Cysts

The diagnosis of ovarian cysts typically begins with a clinical evaluation. Your healthcare provider will ask about your symptoms, when they started, and how they affect your daily life. They will inquire about your menstrual cycle patterns, any family history of ovarian cancer, and your medical history. A physical examination follows, during which your doctor performs a pelvic exam to check for abnormalities, tenderness, or masses.

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Pelvic ultrasound is the primary imaging tool for confirming and evaluating ovarian cysts. This painless procedure uses sound waves to create images of the ovaries and surrounding structures. Two types of ultrasound may be performed: transabdominal ultrasound (scanning from outside the abdomen) and transvaginal ultrasound (using a small probe inserted into the vagina, which typically provides clearer images of the ovaries). During the ultrasound, the technician measures the cyst's size, examines its shape and structure, and determines whether it contains only fluid or has solid components. The appearance on ultrasound helps classify the cyst as simple (fluid-filled only) or complex (containing solid areas, septations, or nodules).

If the ultrasound shows concerning features—such as a large size, complex appearance, or findings suggestive of malignancy—additional imaging may be needed. A CT scan or MRI can provide more detailed information about the cyst and surrounding tissues. In some cases, particularly when cancer risk is a concern, blood tests measuring tumor marker proteins such as CA-125 may be ordered. Elevated levels of these markers can indicate increased risk, though they are not definitive proof of cancer.