Why this topic matters: Ovarian cysts are common and often benign, but a cyst may twist the ovary, rupture, bleed or become infected. Sudden unilateral pelvic pain with nausea/vomiting is an ovarian-torsion emergency until proven otherwise. A positive pregnancy test changes the differential to ectopic pregnancy, and postmenopausal or complex masses require careful malignancy assessment. Emergency medical technicians must stabilise first, test pregnancy, control pain, identify shock and obtain urgent gynaecology review.
Learning objectives
- Define functional and pathological ovarian cysts and explain torsion, rupture and haemorrhage.
- Recognise chronic pressure symptoms and acute cyst accidents.
- Perform ABCDE, pregnancy testing, focused pelvic history, examination and initial investigations.
- Describe emergency care for torsion, rupture, haemorrhage, infection and suspected malignancy.
- Plan nursing monitoring, referral, fertility discussion, discharge safety-netting and prevention of delayed care.
Anatomy and definition
The ovaries lie on either side of the uterus and release ova and sex hormones. An ovarian cyst is a fluid-filled, solid or mixed lesion arising from or near the ovary. Functional cysts form during normal ovulation and often resolve; pathological cysts include endometriomas, dermoid/teratoma, cystadenoma, inflammatory masses and malignant tumours.
The term ovarian cyst accident describes an acute complication such as torsion, rupture or haemorrhage. RCOG guidance emphasises considering these complications when a patient with an ovarian mass presents with acute pain.
Types and risk settings
| Type | Characteristics | Emergency relevance |
|---|---|---|
| Functional follicular/corpus luteum | Often related to ovulation; usually simple and self-limiting. | May rupture, bleed or act as a lead point for torsion. |
| Endometrioma | Old blood associated with endometriosis; chronic pelvic pain/infertility. | Rupture causes acute pain and peritoneal irritation; torsion is possible. |
| Dermoid/teratoma | Benign germ-cell tumour containing fat or calcification. | Common torsion risk; rare rupture/infection. |
| Polycystic ovaries | Multiple follicles within a hormonal syndrome; not the same as a single large cyst. | Do not label acute pain as PCOS without evaluating emergencies. |
| Complex or solid mass | Septations, papillary projections, solid areas, ascites or bilateral disease. | Needs specialist assessment for malignancy or advanced disease, especially after menopause. |
Clinical presentations
- Many cysts are asymptomatic and found incidentally on ultrasound.
- Pressure symptoms include pelvic fullness, bloating, urinary frequency, constipation, dyspareunia or early satiety.
- Hormonal activity may cause irregular, heavy or painful periods.
- Sudden severe unilateral pain, nausea and vomiting suggest torsion; pain may be intermittent when the ovary twists and untwists.
- Sudden pain after exertion or intercourse may follow rupture; dizziness, pallor, syncope or shock suggests intra-abdominal bleeding.
- Fever, worsening pain, offensive discharge or sepsis may indicate infection/abscess or another pelvic source.
Emergency red flags: sudden severe unilateral pelvic pain, persistent vomiting, syncope, pallor, hypotension, tachycardia, abdominal guarding, positive pregnancy test, fever, rapidly increasing abdominal distension, shoulder-tip pain, heavy bleeding or an acute abdomen in a postmenopausal patient.
First contact and scene priorities
- Provide privacy, introduce yourself and explain that acute pelvic pain has several urgent causes. Obtain consent before sensitive questions or examination.
- Assess ABCDE and activate emergency transport/gynaecology support for shock, peritonism, pregnancy, torsion or uncontrolled pain.
- Ask for last menstrual period, pregnancy possibility, contraception, previous cyst/endometriosis, fertility treatment, surgery and medicines.
- Keep a potentially operative patient nil by mouth after senior review; provide analgesia and antiemetic without delaying diagnosis.
- Do not reassure because a cyst was previously labelled “benign”; a new torsion, rupture or ectopic pregnancy can occur.
ABCDE assessment
A — Airway
- Assess vomiting, reduced consciousness, aspiration risk and opioid effect after analgesia.
- Provide airway support as trained if shock, bleeding or sedation compromises protection.
B — Breathing
- Measure respiratory rate and SpO₂; assess pain-related splinting, aspiration, pulmonary embolism and severe anaemia.
- Give oxygen for hypoxaemia or distress and prepare for urgent transfer.
C — Circulation
- Check pulse, BP, capillary refill, skin, bleeding and signs of internal haemorrhage or sepsis.
- Obtain IV access, take blood for full count, group/crossmatch, electrolytes, renal function and pregnancy testing.
- Give isotonic crystalloid for hypovolaemia under local protocol and reassess after every bolus.
D — Disability
- Record AVPU/GCS, glucose, syncope, dizziness and severe pain-related distress.
- Altered consciousness with pelvic pain is shock/haemorrhage or another serious condition until proven otherwise.
E — Exposure
- Inspect for pallor, distension, scars, bruising, vaginal bleeding, fever and signs of infection while preserving dignity.
- Perform abdominal and, when indicated, pelvic examination with consent, chaperone and trained staff.
Focused history
| History area | Questions | Clinical value |
|---|---|---|
| Pain | Onset, sudden/gradual, side, severity, radiation, constant/intermittent, after sex/exercise and previous episodes. | Suggests torsion, rupture, haemorrhage, ectopic or appendicitis. |
| Pregnancy | LMP, contraception, pregnancy possibility, fertility treatment, miscarriage/ectopic history. | Changes diagnosis, imaging and treatment urgently. |
| Associated symptoms | Nausea/vomiting, fever, discharge, urinary/bowel symptoms, dizziness, fainting or shoulder pain. | Assesses torsion, infection, internal bleeding and obstruction. |
| Mass history | Previous ultrasound size/appearance, growth, bilateral disease, endometriosis, family cancer history. | Guides benign vs complex/malignant referral. |
| Medication/surgery | Anticoagulants, fertility medicines, hormonal treatment, previous pelvic surgery. | Identifies bleeding/torsion risk and operative considerations. |
Differential diagnosis of acute pelvic pain
| Condition | Clues | Immediate response |
|---|---|---|
| Ovarian torsion | Sudden intermittent unilateral pain with nausea/vomiting; adnexal mass risk. | Urgent gynaecology and operative assessment; do not wait for a “perfect” ultrasound. |
| Rupture/haemorrhage | Sudden pain, free fluid, pallor, syncope, falling haemoglobin or shock. | IV access, fluids/blood pathway, crossmatch and surgical review. |
| Ectopic pregnancy | Positive pregnancy test, unilateral pain, bleeding, shoulder pain or collapse. | Pregnancy emergency pathway and urgent surgery/gynaecology. |
| PID/abscess | Fever, discharge, cervical/adnexal tenderness and sepsis. | Pregnancy test, antibiotics and admission/referral when severe. |
| Appendicitis/renal colic | Right-sided pain, urinary symptoms, haematuria, fever or bowel signs. | General surgical/renal assessment and targeted imaging. |
Investigations
- Urine/serum pregnancy test in every patient of reproductive potential with pelvic pain or bleeding.
- Full blood count for anaemia/infection; group and crossmatch if bleeding or surgery is possible; CRP, electrolytes, renal/liver function and urinalysis as indicated.
- Pelvic ultrasound with Doppler is first-line in many settings for cyst morphology, free fluid, pregnancy and torsion assessment. Normal Doppler flow does not reliably exclude torsion because intermittent or dual blood supply may persist.
- CT/MRI is selected by the specialist team for complex mass, malignancy, bowel/urinary complications or uncertain diagnosis.
- In postmenopausal or complex lesions, specialist tumour-marker and oncology pathways may be needed; do not interpret CA-125 alone as proof of cancer or benign disease.
Management of suspected ovarian torsion
- Treat sudden unilateral pain with nausea/vomiting as torsion until proven otherwise and call gynaecology urgently.
- Keep nil by mouth, provide IV access, analgesia/antiemetic, fluids if dehydrated and repeated vital signs.
- Do not delay referral for prolonged outpatient observation or repeated imaging when clinical suspicion is high; ovarian blood supply is time-sensitive.
- Definitive treatment is usually urgent laparoscopy to detorse and preserve the ovary when viable; cystectomy or oophorectomy is decided by the surgical team.
- After surgery, monitor pain, bleeding, fever, urine output, wound and fertility concerns; provide emotional support.
Management of rupture or haemorrhage
- Assess shock and internal bleeding; lie the patient safely, keep warm, obtain IV access and use haemorrhage protocols.
- Send full blood count, group/crossmatch and serial haemoglobin; monitor lactate, urine output, abdominal signs and response to fluids.
- Stable patients may be observed with analgesia and serial imaging under specialist care; unstable patients require urgent operative/interventional management.
- Consider pregnancy/ectopic pregnancy, anticoagulants, bleeding disorders and trauma rather than assuming a simple cyst rupture.
Management of uncomplicated or persistent cysts
- Many simple functional cysts resolve; follow-up ultrasound and gynaecology review are based on size, appearance, age, symptoms and menopausal status.
- Persistent, enlarging, complex, bilateral or symptomatic masses need specialist assessment, sometimes surgery or oncology referral.
- Oral contraceptives do not reliably make an existing cyst disappear, though hormonal therapy may be used for related menstrual/endometriosis symptoms.
- Discuss fertility, ovarian reserve, risks of surgery and shared decision-making before elective cystectomy or oophorectomy.
Nursing and EMT interventions
- Trend pain, pulse, BP, temperature, bleeding, abdominal signs, urine output and response to analgesia/fluids.
- Maintain nil-by-mouth status when operation is likely; document last food/drink and allergies.
- Monitor IV site, antiemetic/opioid sedation, fluid overload, haemoglobin trend and signs of sepsis.
- Provide privacy, a chaperone and clear explanations for pelvic examination, ultrasound and surgery.
- Use teach-back for return precautions: worsening unilateral pain, vomiting, fever, faintness, heavy bleeding, distension or positive pregnancy test.
Prevention and follow-up
- Attend planned ultrasound/gynaecology follow-up for cysts that are complex, persistent, large or symptomatic.
- Seek emergency care for sudden severe pain with vomiting or faintness rather than self-treating for several days.
- Discuss fertility treatment risks, especially ovarian stimulation and ovarian hyperstimulation syndrome, with the fertility team.
- Maintain a pain/menstrual diary and review recurrent cysts, endometriosis, contraception and family cancer history.
- Use safe analgesics and avoid excess NSAIDs when pregnant, anticoagulated, ulcer-prone or renally impaired.
Clinical scenarios
Scenario 1 — Torsion: A 17-year-old has sudden intermittent left pelvic pain, vomiting and a known dermoid cyst. Her vitals are currently stable. Give analgesia/antiemetic, pregnancy test, IV access, keep nil by mouth and arrange urgent gynaecology review; normal initial Doppler flow must not falsely reassure the team.
Scenario 2 — Rupture with shock: A woman collapses after sudden lower-abdominal pain and is pale, tachycardic and hypotensive. Treat as internal haemorrhage/ectopic until proven otherwise: ABCDE, oxygen if indicated, large-bore IV access, crossmatch, cautious resuscitation, urgent imaging/surgery and continuous reassessment.
Scenario 3 — Postmenopausal mass: A 61-year-old has progressive bloating, early satiety and a complex bilateral mass. She is stable but anaemic. Arrange urgent gynaecology/oncology assessment and investigate anaemia; do not label it a simple functional cyst.
Common errors to avoid
- Failing to perform a pregnancy test or missing ectopic pregnancy.
- Delaying torsion surgery because pain is intermittent or Doppler flow is present.
- Assuming every cyst is benign, especially after menopause or with complex morphology.
- Giving repeated analgesics without monitoring shock, bleeding, vomiting, renal function or opioid sedation.
- Discharging a patient with syncope, guarding, persistent vomiting, fever or uncontrolled pain.
CYST SAFE: C — Circulation/ABCDE; Y — Young/reproductive pregnancy test; S — Sudden unilateral pain = torsion; T — Test blood and ultrasound; S — Shock/bleeding protocol; A — Analgesia/antiemetic; F — Fast gynaecology referral; E — Explain follow-up and return signs.
Revision questions
- Differentiate functional, endometrioma, dermoid and complex ovarian cysts.
- What symptoms suggest torsion, rupture, haemorrhage or infection?
- Why is a pregnancy test essential in acute pelvic pain?
- Why does normal Doppler flow not completely exclude torsion?
- Outline the management of the shocked patient in Scenario 2.
- Which cyst features require specialist or oncology referral?
Key takeaways
An ovarian cyst becomes an emergency when it twists, ruptures, bleeds, infects or masks another life-threatening diagnosis. Stabilise ABCDE, test pregnancy, treat pain and shock, refer suspected torsion urgently and never let a previous “benign cyst” label delay reassessment.
References for further study
- Royal College of Obstetricians and Gynaecologists. Management of suspected ovarian masses in premenopausal women.
- NHS. Ovarian cyst — symptoms and urgent warning signs.
- ACOG. Adnexal torsion in adolescents.
- NICE Clinical Knowledge Summaries. Acute abdominal pain: gynaecological causes.
- Follow current Uganda Ministry of Health and specialist gynaecology protocols for pelvic pain, torsion, haemorrhage and ovarian masses.