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Rotation of the ovary may obstruct venous then arterial flow, threatening ovarian viability; pain can fluctuate with intermittent torsion.
Sudden unilateral lower abdominal or pelvic pain, often with vomiting, may occur with or without a known ovarian cyst. Always assess pregnancy possibility and ectopic pregnancy.
Give appropriate analgesia, arrange an urgent gynaecology review and keep the patient nil by mouth if surgery is likely. Resuscitate if unstable or haemorrhage is suspected.
Pregnancy testing, observations, FBC and pelvic ultrasonography are commonly used while assessing differentials. The need for diagnostic laparoscopy is a specialist decision.
Normal ovarian Doppler flow does not reliably rule out torsion, because dual blood supply or intermittent torsion may preserve detectable perfusion.
UK reference: NHS ovarian cyst and torsion risk. Focused editorial source check, 7 November 2026; this is not independent clinical or pharmacy sign-off. Verify current local policy, BNF/BNFC and specialist advice before treatment. Not a prescribing protocol.
Related guides: Acute pelvic pain โ FY quick guide โ ๏ธ ๐คฐ ยท Ectopic Pregnancy