Most ovarian cysts produce no symptoms at all and resolve on their own within a few weeks. Your ovaries naturally form small cysts every month as part of ovulation, and you’d never know they were there. But when a cyst grows large enough or develops complications, it sends signals you can learn to recognize: a dull ache on one side of your lower abdomen, bloating, pelvic pressure, or pain that comes and goes with your cycle.
The Most Common Symptoms
The hallmark sign of an ovarian cyst is pressure, bloating, or pain in your lower abdomen, typically on the side where the cyst has formed. The pain can be sharp or dull and often comes and goes rather than staying constant. You might also notice a dull ache radiating into your lower back or thighs.
Beyond the pelvic area, cysts can cause a range of less obvious symptoms:
- Feeling full quickly when eating
- Difficulty emptying your bladder or bowel completely
- Needing to urinate more frequently
- Pain during sex
- Unexplained weight gain
- Breast tenderness
- Painful periods
These symptoms overlap with many other conditions, from digestive issues to urinary tract problems, which is part of why ovarian cysts often go unnoticed or get misattributed. The distinguishing feature is that the discomfort tends to localize on one side of your pelvis rather than spreading evenly across your abdomen.
Ovulation Pain vs. a Problematic Cyst
Here’s where it gets tricky: your ovary produces a small cyst every single cycle as part of normal ovulation. Some people feel a mild twinge of pain lasting one to two days around ovulation, a sensation called mittelschmerz. This is normal and harmless.
A functional cyst becomes a problem when the follicle doesn’t release its egg and keeps growing, or when the empty sac doesn’t shrink after ovulation and fills with fluid instead. In these cases, pain tends to be more persistent, stronger than a brief ovulation twinge, and may stick around for days or weeks rather than resolving in a day or two. A functional cyst can also fill with blood, causing it to swell and produce sharper pain. If you’re noticing pelvic discomfort that lasts well beyond your mid-cycle window or keeps returning, that’s worth paying attention to.
How Symptoms Shift With Your Cycle
Functional cysts don’t always cause noticeable menstrual changes, but the type of cyst matters. Follicular cysts, which form when an egg isn’t released, rarely alter your period. Corpus luteum cysts, which form from the empty follicle after ovulation, are more likely to cause changes in your menstrual pattern. You might notice periods that are heavier, lighter, or irregularly timed. Pelvic pain also tends to flare shortly before or just after your period begins.
Types of Ovarian Cysts
Functional cysts are by far the most common. They develop during your normal menstrual cycle, typically measure larger than 2.5 centimeters, and almost always resolve on their own within a few menstrual cycles without treatment. There are two subtypes: follicular cysts (from an unreleased egg) and corpus luteum cysts (from a sealed-off follicle that fills with fluid, usually growing to about 3 centimeters).
Dermoid cysts, also called teratomas, are a different category entirely. These are a type of ovarian tumor, almost always benign, and can actually be present from birth. They grow slowly, roughly 1.8 millimeters per year, and can contain unusual tissue types like skin, hair, and fat. They often produce no symptoms unless they become large. Though rare, some can reach 64 millimeters or more.
Other types include endometriomas (cysts filled with old blood, linked to endometriosis) and cystadenomas (fluid-filled cysts that grow on the outer surface of the ovary). Each behaves differently, which is why imaging is important for figuring out what you’re dealing with.
How Ovarian Cysts Are Diagnosed
You can’t diagnose an ovarian cyst based on symptoms alone. The standard tool is a pelvic ultrasound, where a small device uses sound waves to create an image of your uterus and ovaries. This confirms whether a cyst is present, pinpoints its location, and reveals whether it’s filled with fluid (usually benign) or solid (which needs closer evaluation).
Your doctor may also order a blood test measuring a protein called CA-125. This test has significant limitations. Elevated CA-125 levels can result from many non-cancerous conditions, including endometriosis, uterine fibroids, pelvic inflammatory disease, menstruation, and even pregnancy. It’s not accurate enough to screen for ovarian cancer on its own, but combined with ultrasound findings, it helps doctors assess risk. For people at very high risk of ovarian cancer, some doctors recommend CA-125 testing paired with transvaginal ultrasound every 6 to 12 months.
What Happens After Diagnosis
What your doctor recommends depends largely on the cyst’s size and characteristics. Simple, fluid-filled cysts under 3 centimeters generally don’t require any follow-up at all. Cysts between 3 and 5 centimeters with normal blood work are typically managed with watchful waiting, with a repeat ultrasound in four to six months to check whether the cyst has grown or resolved.
Cysts larger than 5 centimeters, cysts with complex internal features, cysts on both ovaries, or cysts causing symptoms may prompt a conversation about surgical removal. Many functional cysts never reach that point, shrinking and disappearing within a few cycles.
Warning Signs That Need Emergency Care
Two complications can turn an ovarian cyst into a medical emergency: rupture and torsion.
A ruptured cyst causes sudden, severe pain that feels different from the slow ache of a growing cyst. It may come with nausea, vomiting, fever, dizziness, weakness, or unexpected vaginal bleeding. The pain can hit without warning and feel intense enough that you know something is wrong.
Ovarian torsion happens when a cyst causes the ovary to twist on itself, cutting off its blood supply. The main symptom is sudden, severe abdominal pain that’s often sharp and stabbing, though it can also feel dull and crampy. The pain usually concentrates in your lower belly and may spread to your thighs, sides, and lower back. Nausea and vomiting commonly accompany it. If the ovarian tissue starts losing blood flow, you may develop a fever or abnormal vaginal bleeding or discharge.
Torsion is a time-sensitive emergency because the ovary can be saved if blood flow is restored quickly. If you experience sudden, unexplained lower abdominal pain, especially if you already know you have a cyst, get to an emergency room.