Ovarian torsion: the sudden one-sided pelvic pain that is always an emergency
Last updated September 3, 2026.
Ovarian torsion is the twisting of the ovary on its supporting ligaments, cutting off its blood supply: causing the sudden, severe, one-sided pelvic-or-lower-abdominal pain, usually with the nausea and the vomiting. It is the surgical emergency (the ovary dies within the hours without the untwisting), it most often follows an ovarian cyst or mass, and the fast treatment saves the ovary.
What does it feel like?
The sudden severe pain on one side of the lower abdomen or the pelvis (sharp, constant, sometimes coming in the waves), usually with the nausea and the vomiting, sometimes with the low-grade fever. The pain can wake you from the sleep or strike during the exercise or the sex. It does not settle with the painkillers or the position changes, and it does not come with the period (though it can strike at any cycle point). The occasional kind twists and untwists (the hours of the pain that suddenly resolves, then returns: still the same-day assessment, since the next twist may not untwist).
Who does it happen to, and why?
The main setup: an ovarian cyst or the mass (the bigger ones, especially the 5-plus-centimeter kind, give the ovary the weight to twist), which is why it strikes the reproductive-age women the most (the functional cysts) and also the pregnancy (the corpus-luteum cyst) and the fertility treatment (the stimulated ovaries). It also happens in the children and after the menopause (less often, but those cases still count). The normal ovaries twist rarely.
What happens in the hospital?
- The immediate assessment: the examination, the pregnancy test, and the ultrasound (the Doppler kind looking at the blood flow: though the normal flow does not rule it out when the story fits).
- The surgery (the laparoscopy): the keyhole operation to untwist the ovary, ideally within the hours: the ovary saved when reached in time.
- The cyst handled at the same operation: the underlying cyst usually drained or removed, and only the clearly-dead ovary removed (the surgeons conserve wherever possible, even when the ovary looks dusky: it often recovers).
- The recovery: the short hospital stay, the few weeks off the heavy activity, and the follow-up imaging.
When is it an emergency?
The sudden severe one-sided pelvic pain, always: go to the ER now (or call 911 if the pain is unbearable or you are faint), do not eat or drink while you wait (the surgery may be needed immediately), and do not wait for it to pass. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
Could it be appendicitis or a kidney stone instead?
Yes, and the ER sorts exactly that list: the sudden one-sided lower-abdominal pain has the short differential (the torsion, the appendicitis on the right, the kidney stone, the ruptured cyst, the ectopic pregnancy: hence the pregnancy test), and they share the same rule: the sudden severe pain gets assessed today, not watched at home. The examination, the scan, and the tests separate them within the hours.
Will I lose the ovary?
Usually not, when reached in time: the laparoscopic untwisting restores the blood flow, the surgeons conserve even the dusky-looking ovaries (they recover surprisingly often), and the removal is reserved for the clearly-dead tissue. The timing is the whole variable: the untreated torsion kills the ovary within the hours-to-a-day, which is why the going-now is the ovary-saving move.
I have an ovarian cyst. Does that mean this will happen?
It raises the risk, it does not make it likely: the larger cysts (especially over 5 cm) give the ovary the weight to twist, which is why the big-or-persistent cysts get the follow-up scans or the planned removal, but most cysts never twist. The known-cyst rule: the sudden severe one-sided pain is the ER, always, because yours is the setup where the torsion happens.
The pain suddenly stopped. Am I OK?
Get assessed the same day anyway: the twist can partially untwist (the pain settling as the blood flow partially returns), but the twist tends to recur and the next one may hold, and the underlying cyst remains. The intermittent kind is still the same-day assessment: the ultrasound and the plan (often the elective cyst removal) prevent the emergency version.
Can it happen in pregnancy?
Yes: the early-pregnancy corpus-luteum cyst gives the same setup, and the fertility treatment (the stimulated, enlarged ovaries) raises the risk further. The pregnant kind gets the same emergency surgery (the laparoscopy is done safely in the pregnancy), and the sudden severe one-sided pain in the pregnancy is the ER without the pause.
How long is the recovery after the surgery?
The laparoscopic kind: the one-night-or-less stay for most, the soreness settling over the days, the back-to-desk-work in about one-to-two weeks, the heavy lifting and the vigorous exercise off for the few weeks, and the follow-up scan checking the ovary and the cyst-site. The open operation (rare, for the big masses) stretches each of those.