Corpus Luteum Cyst: The Harmless Ovarian Cyst That Resolves on Its Own
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Quick Answer
A corpus luteum cyst is a harmless, fluid-filled mass that forms on the ovary when the corpus luteum fills with fluid instead of breaking down after ovulation [1]. It usually causes no symptoms, measures 1 to 3 centimeters and goes away on its own within weeks to months [1]. Treatment is rarely needed beyond a heating pad or pain medication [1].
What the research says
Most adnexal masses in pregnancy can be watched, and about 70% resolve on their own. A review in the American Journal of Obstetrics and Gynecology reports that adnexal masses are found in 2 to 20 per 1,000 pregnant patients, that approximately 2% are malignant, and that functional cysts made up 12% of those needing surgery. Ultrasound is the mainstay of evaluation. Surgery is reserved for symptoms, torsion risk, or suspected cancer. This is a narrative review covering all adnexal masses, not only corpus luteum cysts (PubMed: Cathcart et al., Am J Obstet Gynecol, 2023) [2].
Rupture and bleeding from functional cysts usually settle by themselves; torsion is the exception. A review of ovarian cyst accidents found that rupture and hemorrhage usually occur with physiological (functional) cysts and are generally self-limiting, that ultrasound is the first-line test, and that suspected adnexal torsion should be managed with early laparoscopy and untwisting. Clinical features are nonspecific (PubMed: Bottomley and Bourne, Best Pract Res Clin Obstet Gynaecol, 2009) [3].
Waiting is as effective as hormonal treatment for functional cysts. A French-language review with an English abstract concluded that oral contraceptives and ultrasound-guided puncture were not more effective than expectant management for asymptomatic functional cysts in women who have not reached menopause, and that conservative management of simple cysts (clear on ultrasound, under 5 cm, with normal Doppler and CA 125) is more reasonable and safer than surgery. It is an older review (2001) (PubMed: Brun et al., J Gynecol Obstet Biol Reprod, 2001) [4].
What Is a Corpus Luteum Cyst?
A corpus luteum cyst is a mass that sometimes grows on the corpus luteum, a structure in the ovaries that makes important pregnancy hormones [1]. The good news upfront: if a provider finds one during an imaging procedure, there is no need to worry. These cysts are harmless, painless, and usually go away without treatment [1].
A corpus luteum cyst forms when the corpus luteum fills with fluid. It typically goes away on its own within a few weeks to a few months and does not cause symptoms [1].
The corpus luteum is a group of cells that takes shape after the ovary releases an egg each month, a process called ovulation [1]. The sac surrounding these cells contains fluid, and that fluid is what makes up the cyst.
Your corpus luteum produces a hormone called progesterone that supports the uterus and prepares it for a possible pregnancy [1]. When the hormone is no longer needed, the corpus luteum breaks down. Sometimes, however, the sac fills with blood instead — this happens if a small blood vessel on the surface of the ovary is disrupted during ovulation [1]. Blood-filled corpus luteum cysts can cause pain and take longer to go away.
Key Fact | What It Means |
What it is | A normal, harmless, fluid-filled mass that forms on an ovary |
Why it forms | The corpus luteum fills with fluid and expands instead of breaking down after ovulation |
Typical size | Between 1 and 3 centimeters |
Usual symptoms | None — most people do not know they have one |
Usual course | Goes away on its own within a few weeks to a few months |
Treatment usually needed? | No — it resolves without treatment |
Who Gets Corpus Luteum Cysts?
Anyone who menstruates can develop a corpus luteum cyst [1]. Your healthcare provider is more likely to find one if you are pregnant, because these cysts last a little longer to support the pregnancy [1]. Because they are usually painless, most people never know they have one. The cysts often show up as part of a routine pregnancy ultrasound.
Group | Likelihood of Finding One |
Anyone who menstruates | Can develop a corpus luteum cyst |
Pregnant patients | Provider is more likely to find one, because the cyst lasts longer to support the pregnancy |
General population | Most do not know they have one, since cysts are usually painless |
What are the symptoms of a corpus luteum cyst?
You likely will not know you have a corpus luteum cyst because most are small and cause no symptoms [1]. That is the most common experience by far.
If the cyst is blood-filled, you may feel pressure or cramping for a few weeks [1]. This is a temporary experience while the cyst resolves.
Rarely, the cyst can grow large enough to twist the ovary — a condition called ovarian torsion — or leak blood into the abdomen. If either of those things happens, you may experience severe pelvic pain, nausea or vomiting, and weakness or dizziness [1].
Symptom Pattern | What You May Experience |
Most common | No symptoms at all — the cyst is small and painless |
Blood-filled cyst | Pressure or cramping for a few weeks |
Rare: cyst twists the ovary (ovarian torsion) or leaks blood into the abdomen | Severe pelvic pain, nausea or vomiting, weakness or dizziness |
You should call your provider if you develop any of the rare symptoms listed above.
What Causes a Corpus Luteum Cyst?
A corpus luteum cyst forms in your ovaries when the corpus luteum fills with fluid and expands instead of breaking down [1].
Here is the monthly cycle behind it. Each menstrual cycle, a sac in one of your ovaries called a follicle creates and releases an egg. Soon after the egg is released, the corpus luteum forms from the wall of the follicle. It then releases progesterone, which thickens the lining of the uterus so a fertilized egg can take hold there [1]. This creates a healthy environment inside the uterus where the fertilized egg becomes a fetus.
Your corpus luteum goes away when the placenta takes over making progesterone to support a pregnancy — usually around the 12th week [1]. If the egg does not get fertilized, the corpus luteum usually goes away 10 to 12 days after ovulation [1].
Stage of the Cycle | What Happens |
Each menstrual cycle | A follicle in one ovary creates and releases an egg |
Soon after ovulation | The corpus luteum forms from the wall of the follicle and releases progesterone |
Progesterone's job | Thickens the uterine lining so a fertilized egg can take hold and a healthy environment forms for the egg to become a fetus |
If the egg is not fertilized | The corpus luteum usually goes away 10 to 12 days after ovulation |
If you become pregnant | The placenta takes over making progesterone, usually around the 12th week, and the corpus luteum goes away |
When a cyst forms | The corpus luteum fills with fluid and expands instead of breaking down |
You should not expect a corpus luteum cyst to impact your life at all. Complications can happen, but they are rare.
How Is a Corpus Luteum Cyst Diagnosed?
A corpus luteum cyst is usually found by accident during an ultrasound [1], because it does not cause symptoms. Because they do not cause symptoms, most people never have one detected at all. A corpus luteum cyst is usually between 1 and 3 centimeters (cm) in size [1]. Your provider may see it on your ovary in the first trimester or during a pelvic ultrasound in the second half of your menstrual cycle [1].
Diagnostic Step | What It Shows |
Ultrasound (often accidental finding) | The cyst usually appears by accident during an imaging scan |
Typical size on imaging | Between 1 and 3 centimeters |
First trimester | Provider may see the cyst on the ovary in early pregnancy |
Second half of menstrual cycle | Provider may see the cyst during a routine pelvic ultrasound |
How is a corpus luteum cyst treated and managed?
Chances are you will not need treatment for a corpus luteum cyst. The body handles it on its own in most cases. If you are pregnant, the cyst will probably go away in your second trimester [1]. If you are not pregnant, the cyst will break down a few weeks after ovulation [1].
In the meantime, your provider can offer treatment to help you manage any symptoms. Management options include using a heating pad (if you are not pregnant), taking pain medications, and pausing sexual intercourse if it is worsening your pain or the cyst is unusually large [1].
Management Approach | When It Applies |
No treatment needed | Most cases — the cyst goes away on its own |
During pregnancy | Cyst will probably go away in the second trimester |
If not pregnant | Cyst breaks down a few weeks after ovulation |
Heating pad | Symptom relief, if you are not pregnant |
Pain medications | Symptom relief |
Pausing sexual intercourse | If intercourse is worsening your pain or the cyst is unusually large |
Cyst removal (rare) | Only if the cyst gets so big that the ovary twists, which could harm the ovary or pose risks to the pregnancy |
When Should You See a Healthcare Provider?
Seek emergency care right away if a corpus luteum cyst bursts and causes severe pain or grows so big that it twists your ovary [1]. You should also seek emergency care if it grows so big that it twists your ovary. Get help right away if you notice any of these warning signs [1]:
Emergency Sign | Why It Matters |
Persistent nausea and vomiting with pelvic pain | May signal a cyst that has leaked or twisted |
Feeling light-headed or dizzy (like you are about to faint) | May signal blood leaking into the abdomen |
Stabbing pain in one side of your abdomen | May signal ovarian torsion or a burst cyst |
These warning signs are important to act on quickly. Keep in mind, though, that corpus luteum cysts usually disappear without causing problems [1].
What is the outlook for a corpus luteum cyst?
The outlook for a corpus luteum cyst is excellent. These cysts are harmless, and you probably will not feel any symptoms that let you know they are there.
A common question is whether you can get pregnant with a corpus luteum cyst. The answer is yes. These cysts are a normal part of early pregnancy [1]. Sometimes, a large or persistent corpus luteum cyst can cause discomfort. If that is the case, your healthcare provider will talk to you about what comes next [1].
You hear the word "cyst" and naturally think the worst. But there is no need to worry if your healthcare provider says they see a corpus luteum cyst. If the cyst is making you uncomfortable, your provider can help you manage symptoms until it goes away on its own.
Outlook Question | Answer |
Is it dangerous? | No — it is harmless and usually painless |
Will it go away? | Yes, usually within a few weeks to a few months, without treatment |
Can I get pregnant with one? | Yes — it is a normal part of early pregnancy |
What if it causes discomfort? | Your provider can help manage symptoms until it resolves |
How common are complications? | Rare |
Conclusion
A corpus luteum cyst sounds alarming, but it is one of the least worrying findings in gynecology. It is a normal, harmless part of the menstrual and pregnancy cycle for anyone who menstruates. Most people never feel it, most cysts resolve on their own within weeks to months, and treatment is almost never required.
If a routine ultrasound reveals a corpus luteum cyst, the practical response is simple reassurance. Manage any pressure or cramping with a heating pad or pain medication, watch for the rare emergency signs, and let your body do the rest.
If you have questions about a corpus luteum cyst or any pelvic symptom, talk to a healthcare provider who knows your history. For more context, see our guide to chronic pelvic pain.
Frequently Asked Questions
1. What is a corpus luteum cyst?
A corpus luteum cyst is a normal, harmless, fluid-filled mass that forms on an ovary when the corpus luteum fills with fluid and expands instead of breaking down after ovulation. These cysts usually cause no symptoms and go away on their own within a few weeks to a few months.
2. What causes a corpus luteum cyst to form?
A corpus luteum cyst forms when the corpus luteum fills with fluid and expands instead of breaking down after ovulation. If the egg is not fertilized, the corpus luteum normally goes away 10 to 12 days after ovulation. When it does not, the fluid-filled sac becomes the cyst.
3. What are the symptoms of a corpus luteum cyst?
Most corpus luteum cysts cause no symptoms at all. If the cyst is blood-filled, you may feel pressure or cramping for a few weeks. Rarely, a large cyst can twist the ovary or leak blood into the abdomen, causing severe pelvic pain, nausea or vomiting, and weakness or dizziness.
4. Can a corpus luteum cyst cause pain?
Usually not. Most corpus luteum cysts are painless, which is why most people never know they have one. A blood-filled cyst can cause pressure or cramping for a few weeks. Pain from a cyst that is very large, has ruptured, or has twisted the ovary is rare but needs medical attention.
5. Is a corpus luteum cyst common during pregnancy?
Yes. A corpus luteum cyst is a normal part of early pregnancy. Providers are more likely to find one if you are pregnant because these cysts last a little longer to support the pregnancy. If you are pregnant, the cyst will usually go away on its own in the second trimester.
6. How big is a corpus luteum cyst usually?
A corpus luteum cyst is usually between 1 and 3 centimeters in size. A provider may see it on the ovary during a first-trimester pregnancy ultrasound or during a pelvic ultrasound in the second half of the menstrual cycle.
7. Do you need treatment for a corpus luteum cyst?
Usually not. If you are pregnant, the cyst will probably go away in the second trimester. If you are not pregnant, it will break down a few weeks after ovulation. In the meantime, your provider may recommend a heating pad (if not pregnant), pain medications, or pausing sexual intercourse if it worsens your pain.
8. When should I see a doctor about a corpus luteum cyst?
Seek emergency care if the cyst bursts and causes severe pain, and also if it grows so large that it twists the ovary. Get help right away for persistent nausea and vomiting with pelvic pain, feeling light-headed or dizzy, or stabbing pain in one side of your abdomen.
9. What is ovarian torsion, and how does it relate to corpus luteum cysts?
Ovarian torsion happens when a large cyst makes the ovary twist. For a corpus luteum cyst this is rare, but if it occurs it can harm the ovary or pose risks to a pregnancy and requires emergency care. Symptoms include severe pelvic pain, nausea or vomiting, and weakness or dizziness.
10. Can I still get pregnant with a corpus luteum cyst?
Yes. Corpus luteum cysts are a normal part of early pregnancy, and anyone who menstruates can develop one. Sometimes a large or persistent cyst can cause discomfort, in which case your provider will discuss next steps with you.
Related Reading
Ovarian Cysts: Symptoms, Causes, and Treatment Options Explained explains the main types of ovarian cysts and when they need treatment.
Ruptured Ovarian Cyst: Symptoms, Causes, and Emergency Care covers the warning signs of a burst cyst and when to seek emergency care.
Ovarian Torsion: Symptoms, Causes, Diagnosis, and Emergency Treatment explains the emergency twisting of an ovary that a large cyst can cause.
Transvaginal Ultrasound: Why It's Done, How to Prepare and What to Expect describes the imaging test most often used to find and monitor ovarian cysts.
References
Cleveland Clinic. Corpus Luteum Cyst. Cleveland Clinic. February 3, 2026. https://my.clevelandclinic.org/health/diseases/22340-corpus-luteum-cyst
Cathcart AM, Nezhat FR, Emerson J, et al. Adnexal masses during pregnancy: diagnosis, treatment, and prognosis. Am J Obstet Gynecol. 2023;228(6):601-612. doi:10.1016/j.ajog.2022.11.1291. PMID: 36410423.
Bottomley C, Bourne T. Diagnosis and management of ovarian cyst accidents. Best Pract Res Clin Obstet Gynaecol. 2009;23(5):711-724. doi:10.1016/j.bpobgyn.2009.02.001. PMID: 19299205.
Brun JL, Le Touzé O, Leng JJ. [Medical and surgical treatment of functional ovarian cysts]. J Gynecol Obstet Biol Reprod (Paris). 2001;30(1 Suppl):S41-S52. PMID: 11917375.
Medical Disclaimer
This article is for informational purposes only and does not constitute medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read here.
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