What Is Ovarian Torsion and Why Is It an Emergency?
How a twisted ovary can silently lose blood flow and become a surgical emergency
Pelvic pain that can be hard to read
Ovarian torsion is one of those diagnoses emergency doctors are trained not to miss. Not because every woman with pelvic pain has it. Most do not.
But because it is one of the more important causes of sudden one-sided pelvic pain in a patient with ovaries, and it can be easy to confuse with many other things. That is part of what makes it tricky.
A patient may have pelvic pain, nausea, vomiting, and still have fairly normal labs. The exam may not be dramatic. A CT scan may be unrevealing. Sometimes the story fits torsion well. Other times it only sort of fits.
So in the ER, ovarian torsion is often less about a “classic presentation” and more about whether it needs to stay on the list.
What ovarian torsion actually is
Ovarian torsion happens when the ovary twists on the structures that support it.
Those supporting structures also contain the blood vessels that feed the ovary. So when the ovary twists, blood flow can become impaired. Think of it like a garden hose getting kinked. The more it twists, the harder it is for blood to move through.
That is why doctors care about it. If the blood supply is significantly reduced long enough, the ovary can become injured. That is also why ovarian torsion is considered a time-sensitive diagnosis, even though the exact course can vary from patient to patient.
It is not always an immediate all-or-nothing event. Some torsions may twist and partially untwist. Some may present more gradually. That is one reason the diagnosis is not always straightforward.
Who gets it, and why it happens
Ovarian torsion tends to happen more often when the ovary is enlarged. That can happen because of ovarian cysts, a benign ovarian mass, hormonal stimulation, or sometimes no clearly identified reason at all. A cyst itself is not torsion, but a heavier ovary may be more likely to twist.
It is more commonly considered in younger and reproductive-age patients, but it is not exclusive to one age group. It can happen in teens, adults, and occasionally outside those groups as well.
This is why the ER does not look at pelvic pain and ask only, “What is most likely?” It also asks, “What do I need to make sure I am not missing?”
How the ER evaluates it
The first clues are usually in the story. Doctors want to know whether the pain is on one side, whether it started suddenly, whether it is severe, whether there is nausea or vomiting, and whether anything like this has happened before. Those features can raise suspicion, but none of them are specific.
That is why the workup often includes pregnancy testing, labs, sometimes CT depending on the broader abdominal differential, and most importantly, pelvic ultrasound with Doppler.
Ultrasound is the main test used to evaluate for ovarian torsion because it looks directly at the ovary and can assess size, position, and blood flow.
And this is the most important practical point: a reassuring ultrasound, in the right clinical context, often helps lower concern and can absolutely be part of a safe ER discharge plan. That is how these patients are managed every day.
Why this diagnosis can still be difficult
Ovarian torsion is not always a clean yes-or-no diagnosis from one data point. Ultrasound is the best tool we have in the ER for it, but like many tests in medicine, it is interpreted together with the history, exam, symptoms, and overall level of suspicion.
That is because pelvic pain has a broad differential. Torsion is just one possibility among others like ovarian cyst pain, cyst rupture, appendicitis, ectopic pregnancy, gastrointestinal causes, and muscular pain.
So the real ER job is not to tell every patient with pelvic pain, “This might still be torsion.” The job is to decide whether torsion remains clinically concerning enough to require urgent gynecologic involvement versus whether the evaluation is overall reassuring enough that another diagnosis is more likely.
That is a very different and much more realistic question. And that is the real lesson of ovarian torsion: not that it is everywhere, but that it is important enough to think about when the story fits.
THE BOTTOM LINE
• Ovarian torsion is a time-sensitive cause of pelvic pain, but it is only one of many possible causes of lower abdominal or pelvic pain
• The main ER test is pelvic ultrasound with Doppler, interpreted together with the patient’s symptoms, exam, and overall clinical picture
• Most pelvic pain evaluations do not turn out to be ovarian torsion, but it remains an important diagnosis for ER doctors to keep in mind when the pattern fits
Ask the ER Doctor
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It often causes sudden one-sided lower abdominal or pelvic pain, sometimes with nausea or vomiting. But the presentation can vary, which is part of what makes it a challenging diagnosis.
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Ultrasound is the main test used to evaluate for ovarian torsion, but like many tests in medicine, it is interpreted in the context of the full clinical picture. Doctors do not rely on one isolated finding alone.
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It can if blood flow is significantly impaired long enough, which is why the diagnosis matters. But outcomes vary, and treatment decisions depend on the overall clinical situation.
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If torsion is strongly suspected or confirmed, gynecology is involved and treatment is typically surgical. The goal is to preserve ovarian function whenever appropriate.
By Dr. Karim Ali, Emergency Physician