Ovarian Cyst Symptoms: 7 Red Flags You Should Never Ignore

Imagine this: You’ve been dealing with heavy periods for months. The cramps are getting worse. Something feels off, but you keep telling yourself it’s “just hormones.” Then one day, the pain is so bad you can’t stand up straight, and you end up in the ER. That’s exactly what happened to one woman whose story went viral in the PCOS community. She was walking around with a 13-centimeter ovarian cyst — roughly the size of a grapefruit — that had been silently growing for months. The ER initially mistook it for her bladder. She needed emergency surgery that night.

Her story is a powerful reminder that ovarian cyst symptoms can be easy to dismiss — until they’re not. Whether you have PCOS, a history of cysts, or just want to know what to watch for, this guide walks you through the warning signs that deserve your attention, when to head to the ER, and how to advocate for yourself if something feels wrong.

What Are Ovarian Cysts, Anyway?

Ovarian cysts are fluid-filled sacs that form on or inside your ovaries. They’re incredibly common. In fact, most women will have at least one at some point in their lives, often without ever knowing it. The Mayo Clinic explains that most cysts are “functional” — they form as a normal part of your menstrual cycle and disappear on their own within a few months.

But here’s the thing. Some cysts grow large. Some cause symptoms. And a small number can lead to complications like rupture or ovarian torsion (when the ovary twists on itself), which is a medical emergency.

The woman in the Reddit story had a cyst that measured 12 x 12.6 x 13 centimeters. That’s bigger than a softball. It was pressing on her uterus, pushing out a cervical polyp, and causing symptoms she’d been dismissing for six months.

Ovarian Cyst Symptoms: What to Watch For

Here’s what’s tricky about ovarian cyst symptoms. Many cysts cause no symptoms at all. You might only find out you have one during a routine pelvic exam or ultrasound for something else. But when symptoms do appear, they often include:

• Pelvic pain that comes and goes, often on one side
• A feeling of fullness, pressure, or heaviness in your lower belly
• Bloating or swelling in your abdomen
• Pain during sex
• Changes in your period — heavier bleeding, irregular cycles, or spotting between periods
• Frequent or urgent need to pee, or trouble emptying your bladder

A review of 244 ovarian cyst cases found that abdominal pain was the most common symptom, affecting nearly 60% of women. The right ovary was affected more often than the left.

Now, you might be thinking: “But my periods are always heavy. How do I know if this is different?” That’s a fair question. Here’s what stood out in the Reddit story: she was soaking through a super tampon every hour for days. That’s not normal. And the cramps were so bad they woke her up at night and left her curled in a ball.

When Ovarian Cyst Symptoms Become an Emergency

This is the most important section of this article. The Office on Women’s Health lists these as emergency warning signs for ovarian cysts:

• Sudden, severe abdominal or pelvic pain
• Pain accompanied by fever or vomiting
• Signs of shock: feeling faint, dizzy, weak, or having rapid breathing

In the Reddit story, the woman’s pain reached an 8 out of 10. It came in waves. She was nauseated and couldn’t eat. The hydrocodone she was prescribed didn’t touch the pain. That’s the kind of pain that warrants an ER visit — not waiting for a clinic appointment.

A 2022 study on ruptured ovarian cysts found that about 84% of women with ruptured cysts were managed without surgery. But the 15% who needed surgery had larger cysts and more internal bleeding. The takeaway? Most ruptures are self-limiting, but some are serious. You can’t tell which is which without medical evaluation.

Another 2026 case report describes a 19-year-old who needed emergency laparoscopic surgery for a ruptured hemorrhagic cyst that caused significant internal bleeding. It’s rare, but it happens.

Why Large Cysts Can Be Misdiagnosed

Here’s something most articles don’t talk about. Large ovarian cysts can be mistaken for other things on imaging. In the Reddit story, the ER team initially thought the 13 cm cyst was her bladder. They scanned her bladder, saw what looked like three times the normal amount of urine, put in a catheter — and only 25 mL came out. It was the cyst.

This isn’t just a one-off story. A 2015 review found that nearly 18% of suspected ovarian cysts turned out to be something else — para-ovarian cysts, retroperitoneal masses, or other structures. The reverse can also happen: a large cyst can look like something it’s not.

What does this mean for you? If you’re in the ER with pelvic pain and the doctor says your bladder looks full, but you don’t actually feel like you need to pee, speak up. Say, “Could this be an ovarian cyst?” The woman in the story’s boyfriend suggested this, and he was right.

How to Advocate for Yourself in the ER

One of the most striking parts of the Reddit story is how her symptoms were initially downplayed. The first ER wasn’t overly concerned. The on-call OB/GYN didn’t think her case warranted coming in. It was only because the ER doctor she saw the second time listened and believed her that she got the care she needed.

Here’s what you can do if you find yourself in a similar situation:

• Be specific about your symptoms. Don’t just say “I’m in pain.” Say: “The pain is an 8 out of 10. It’s on my right side. It comes in waves. I can’t eat or sleep. I’ve been bleeding through a super tampon every hour for days.”
• Mention your history. If you have PCOS, endometriosis, or a history of cysts, say so. If you’ve had a cyst before, mention the size.
• Ask for specific tests. Say: “Can I have an ultrasound to check for ovarian cysts?” Ultrasound is the gold standard for diagnosing cysts.
• Bring someone with you. The woman’s boyfriend was the one who suggested the cyst might be what they were seeing on the scan. A second set of ears — and a voice — can make a huge difference.
• If you’re not being heard, ask to speak to a different provider. You have the right to a second opinion, even in the ER.

What About PCOS and Ovarian Cysts?

If you have PCOS, you might be wondering if you’re at higher risk. The answer is yes — but not in the way you might think. PCOS is characterized by multiple small cysts (often described as a “string of pearls” on ultrasound), not usually large solitary cysts like the one in this story. However, having PCOS doesn’t protect you from developing large cysts, and the hormonal imbalances of PCOS can contribute to cyst formation.

The woman in the story had PCOS. She’d been managing it with GLP-1 medication for three years. Her periods had been regular. Then suddenly, they weren’t. The heavy bleeding started out of nowhere. That was her first red flag.

If you have PCOS and notice a sudden change in your period pattern — especially heavy bleeding that’s not normal for you — don’t assume it’s “just PCOS.” Get it checked out.

The Bottom Line

The woman in the Reddit story is okay now. Her ovary was preserved. She’s recovering. But her message is one we should all take to heart: If your body suddenly changes — especially heavy bleeding that isn’t normal for you — please get it checked out. It might be “just hormones.” Or it might be a 13 cm ovarian cyst trying to rearrange your internal organs.

You know your body better than anyone. If something feels wrong, trust that feeling. Ovarian cyst symptoms can be subtle, but they can also be loud and clear. The key is knowing which ones to take seriously — and having the courage to speak up when you do.