Ovarian Cysts: Types, Symptoms, and When to Worry. A Complete Guide

Pelvic Pain & Conditions
Written By Becky Freeman

Almost every woman with ovaries will develop an ovarian cyst at some point in her life, and the majority will never know it happened. That statement alone says a great deal about how common, and how frequently harmless, ovarian cysts actually are. But "most are harmless" is not the same as "all are harmless," and understanding the difference between a cyst that quietly resolves on its own and one that needs medical attention is exactly the kind of knowledge that puts you in control of your health. Whether you have just been diagnosed with an ovarian cyst, are experiencing unexplained pelvic pain, or simply want to understand what is going on inside your body, this guide walks you through everything you need to know

What Is an Ovarian Cyst?

An ovarian cyst is a fluid-filled sac that forms on or inside one of the ovaries. The ovaries two small, almond-shaped organs on either side of the uterus are responsible for producing eggs and the hormones estrogen and progesterone that regulate the menstrual cycle. Because the ovaries are constantly cycling through the process of developing and releasing eggs, they are also naturally prone to forming cysts as part of that normal activity

Cysts range dramatically in size, from a few millimeters to several inches across, and they can be thin-walled and filled with clear fluid, thicker and filled with mucus, or contain more complex material like blood or solid tissue depending on what type they are. The vast majority are benign, cause no symptoms, and disappear without any treatment within a few weeks to a few months. A smaller subset become large enough to cause symptoms, rupture, or twist the ovary situations that require prompt medical care

The Different Types of Ovarian Cysts

Not all ovarian cysts are created equal, and knowing the type you are dealing with shapes the entire conversation about risk, monitoring, and treatment.

Functional cysts are by far the most common type and are directly tied to the menstrual cycle. They develop when a follicle the small sac in the ovary that grows around a developing egg each month either fails to rupture and release the egg as it should, forming a follicular cyst, or when the sac that held the egg does not dissolve properly after ovulation and instead fills with fluid, forming a corpus luteum cyst. Both types are considered a normal part of the reproductive process, almost never cause serious problems, and typically resolve on their own within one to three months

Endometriomas, sometimes called chocolate cysts because of their dark reddish-brown contents, form when endometrial tissue grows on or inside the ovary as part of endometriosis. Each month that tissue bleeds just as the uterine lining does, but the blood has nowhere to drain, so it accumulates and forms a cyst. Endometriomas are more likely to cause pain particularly during periods and sex and are significantly associated with fertility challenges

Dermoid cysts, technically called mature cystic teratomas, are a fascinating and slightly unsettling type of cyst that can contain a variety of tissue types including fat, hair, skin, and even teeth or bone, because they develop from cells that were present from birth. They are almost always benign but tend to grow slowly over time and are less likely to resolve on their own, often requiring surgical removal if they become large or symptomatic

Cystadenomas develop on the outer surface of the ovary and fill with either thin watery fluid or thicker mucous material. They can grow quite large and, while usually benign, carry a slightly higher likelihood than functional cysts of developing features that require further evaluation, especially in postmenopausal women

Hemorrhagic cysts occur when a blood vessel in a cyst wall breaks and bleeds into the cyst itself. They can be intensely painful and can rupture, but many resolve on their own with rest and pain management

Symptoms: From Silent to Severe

The most common symptom of an ovarian cyst is no symptom at all. Functional cysts in particular come and go throughout the reproductive years without any fanfare, discovered only when an ultrasound is done for another reason. When symptoms do appear, they typically reflect the cyst's size, type, and whether any complications have developed

Mild to moderate symptoms include a dull or sharp aching pain on one side of the lower abdomen or pelvis that may come and go, a sense of fullness, heaviness, or bloating in the lower belly, and discomfort during sex particularly with deep penetration. Some people notice changes in their menstrual cycle, including heavier or lighter periods, irregular bleeding, or spotting between periods, especially with cysts that are influencing hormone production. Pressure on the bladder from a larger cyst can cause a frequent urge to urinate, while pressure on the bowel may lead to constipation or a feeling of needing to have a bowel movement urgently

Severe symptoms demand immediate medical attention and may signal a ruptured cyst or ovarian torsion. A sudden, sharp, severe pain in the lower abdomen especially if accompanied by fever, vomiting, dizziness, lightheadedness, or heavy vaginal bleeding is a medical emergency. These symptoms can indicate that a cyst has burst and is causing internal bleeding, or that the ovary has twisted on itself, cutting off its own blood supply in a condition called ovarian torsion

Ovarian Cysts vs. PCOS: Two Different Things

One of the most common sources of confusion in women's health is the relationship between ovarian cysts and polycystic ovary syndrome (PCOS). The names suggest a connection, and an ultrasound showing multiple small follicles on the ovaries can make them look related but they are fundamentally different conditions

An ovarian cyst is a single, usually larger fluid-filled structure that forms independently. PCOS involves multiple small immature follicles often 12 or more that line the ovaries in a characteristic pattern, but these are not traditional cysts; they are immature egg sacs that never fully developed or released. More importantly, PCOS is a systemic hormonal disorder involving elevated androgens, insulin resistance, and disrupted ovulation that affects the whole body, not just the ovaries. Having ovarian cysts does not mean you have PCOS, and having PCOS does not mean your symptoms are caused by individual cysts. A proper diagnosis requires blood tests, a detailed symptom history, and clinical evaluation not just an ultrasound alone

Ovarian Cysts and Fertility

The relationship between ovarian cysts and fertility is nuanced and depends heavily on the type of cyst involved. Simple functional cysts the kind that form and dissolve as part of a normal cycle generally do not affect fertility at all. Endometriomas, however, are meaningfully linked to reduced fertility. They can damage the ovarian tissue surrounding them, reduce the pool of available eggs, and create an inflammatory environment that interferes with implantation

Dermoid cysts and cystadenomas can also impact fertility if they grow large enough to displace healthy ovarian tissue or interfere with normal ovarian function. Interestingly, research suggests that surgery to remove certain cysts while sometimes necessary can itself reduce ovarian reserve by inadvertently removing healthy ovarian tissue along with the cyst. This is why reproductive specialists strongly advocate for conservative, minimally invasive surgical techniques when operating on ovaries in people who want to preserve their fertility, and why surgery should only be undertaken when there is a clear clinical reason.rylonclinic+2

For people undergoing IVF, the presence of certain cysts particularly functional cysts at the start of a cycle may delay the beginning of stimulation or affect how the ovaries respond to medication, making close monitoring essential

How Ovarian Cysts Are Diagnosed

Diagnosis begins with a pelvic exam, during which a provider may feel an enlarged or tender ovary that prompts further investigation. Transvaginal ultrasound is the primary imaging tool for evaluating ovarian cysts and provides detailed information about size, shape, wall thickness, internal contents, and whether any solid components or abnormal blood flow patterns are present features that help distinguish benign cysts from potentially concerning ones

Blood tests play a supporting role. A CA-125 test, which measures a protein that can be elevated in ovarian cancer, is sometimes ordered when a cyst has features that make it difficult to classify as clearly benign particularly in postmenopausal women. It is important to understand that CA-125 is not a standalone cancer test; it can be elevated by many benign conditions including endometriosis, fibroids, and pelvic infection, so it is always interpreted alongside imaging and clinical findings. A pregnancy test is also standard because an ectopic pregnancy can mimic an ovarian cyst on both examination and ultrasound

Treatment: Watchful Waiting to Surgery

Treatment depends on the type, size, and behavior of the cyst, as well as your age, symptoms, and whether you are premenopausal or postmenopausal

For simple, small, asymptomatic cysts in premenopausal women, watchful waiting with a follow-up ultrasound in six to twelve weeks is the standard approach. Most functional cysts resolve on their own within this window without any intervention. Over-the-counter pain relievers like ibuprofen or naproxen can manage discomfort during this period

Hormonal contraceptives such as birth control pills are sometimes prescribed to prevent new functional cysts from forming in people who experience them repeatedly, though they do not actively shrink an existing cyst. For endometriomas, hormonal therapies including progestin-only pills, hormonal IUDs, or GnRH agonists can reduce symptoms and slow growth, though surgery is often needed for larger or more symptomatic endometriomas

When a cyst is large, growing, causing significant symptoms, has complex features on imaging, or has not resolved after several months of monitoring, surgery becomes the recommended path. Laparoscopic cystectomy a minimally invasive procedure in which a surgeon removes the cyst through small incisions using a camera and specialized instruments is the preferred surgical approach for most benign ovarian cysts because it preserves as much healthy ovarian tissue as possible and allows for a faster recovery. In rare cases where a cyst is very large, deeply embedded, or suspicious for malignancy, open surgery may be necessary

Ovarian Cysts vs. Ovarian Cancer: What You Need to Know

The fear most people carry when they hear "ovarian cyst" is that it might be cancer, and while that fear is understandable, it is important to have an accurate picture of the actual risk. The overwhelming majority of ovarian cysts particularly in premenopausal women are benign. Less than one percent of new ovarian growths in people who are still menstruating are related to ovarian cancer

The risk profile does shift after menopause, when functional cysts become far less common and any new ovarian growth warrants more careful evaluation. Features that raise concern include cysts with thick walls, internal solid components, multiple internal chambers, abnormal blood flow visible on Doppler ultrasound, or rapidly increasing size. These features do not confirm cancer they simply indicate the need for closer evaluation and possibly a biopsy or specialist referral. Regular gynecological care and not ignoring new or changing pelvic symptoms remain your best tools for early detection of any serious condition

When to Seek Immediate Help

If you experience sudden, severe pelvic or abdominal pain especially with fever, vomiting, rapid heartbeat, dizziness, or fainting go to an emergency room immediately. These symptoms can indicate a ruptured cyst causing internal bleeding or ovarian torsion, both of which are time-sensitive medical emergencies that require urgent intervention. Do not wait to see if the pain passes on its own

For ongoing symptoms that are not emergencies such as persistent pelvic aching, irregular periods, pain during sex, or pressure with urination or bowel movements schedule an appointment with your gynecologist and ask specifically for a pelvic ultrasound to evaluate your ovaries. Many people live with undiagnosed ovarian cysts for months because their symptoms are attributed to other causes. Advocating for thorough evaluation is the most important step you can take

Ovarian cysts are a normal part of having ovaries, and for most people they come and go without drama. But understanding the different types, knowing what symptoms to watch for, and maintaining regular gynecological care means you are never caught off guard and you are never left wondering whether what you are feeling is something that needs attention.

“This article is based on current medical guidance and research from the following trusted sources:”

Resources and Sources

About the Author

Becky Freeman is the founder of BVTalks® and Bee Vee Clean. She focuses on women’s intimate health, vaginal microbiome education, and creating practical, easy-to-understand content for everyday care.

Disclaimer: This article is for education only and is not a substitute for personal medical advice. Always talk to your own clinician about your symptoms and treatment options.

Becky Freeman https://www.bvtalks.com
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