Quick answer. Ovarian cysts are very common and most are benign, especially the ‘functional’ cysts that form with the menstrual cycle and often disappear on their own within a few months. Many cause no symptoms and are found incidentally on a scan. See a doctor for persistent pelvic pain, bloating, a feeling of fullness, or changes in your periods. Sudden, severe one-sided pelvic pain with nausea or vomiting may signal ovarian torsion or rupture — a medical emergency, so go to A&E. Cysts in postmenopausal women, or those that are large, solid or complex on ultrasound, need closer evaluation. Pelvic ultrasound is the main test; treatment ranges from watchful waiting to keyhole surgery.
Ovarian cysts — fluid-filled sacs on or in the ovary — are extremely common and, in women who are still having periods, are usually harmless. Most are ‘functional’ cysts that form as part of the normal menstrual cycle and resolve by themselves. Many are discovered by chance during a scan done for another reason.
This guide explains the different types, the symptoms to watch for, the emergency warning signs of torsion or rupture, and how cysts are assessed and managed in Singapore. It is general information only and not a substitute for review by a doctor.
At a glance
| Type | What it is | Typical behaviour |
|---|---|---|
| Functional (follicular / corpus luteum) | Forms with the menstrual cycle | Very common, benign, usually resolves in 1-3 cycles |
| Dermoid cyst | Contains tissue such as fat, hair or skin | Usually benign; may grow and occasionally need removal |
| Endometrioma ('chocolate cyst') | Linked to endometriosis | Can cause pain; often needs treatment or surgery |
| Cystadenoma | Develops from the ovary surface | Usually benign but can grow large |
| Complex / suspicious cyst | Solid areas or mixed features | Needs closer evaluation, especially after menopause |
How common are ovarian cysts?
Ovarian cysts are very common in women of reproductive age. The most frequent are functional cysts, which form as a normal part of ovulation: a follicle that does not release its egg or a corpus luteum that fills with fluid. These are benign and usually disappear on their own within one to three menstrual cycles. Because they often cause no symptoms, many are only found incidentally during a pelvic ultrasound.
Symptoms
Many ovarian cysts cause no symptoms at all. When they do, you may notice:
- Dull pelvic ache, often on one side
- Bloating or a feeling of pressure or fullness in the lower abdomen
- Pain during sex
- Changes in your periods
- Needing to pass urine more often (if a large cyst presses on the bladder)
Because these symptoms overlap with many other conditions, persistent or new symptoms should be assessed rather than self-diagnosed.
When to worry — emergency red flags
Go to A&E immediately if you have sudden, severe pelvic or lower abdominal pain — particularly on one side — especially with nausea, vomiting, fever or feeling faint. This can indicate:
- Ovarian torsion — the ovary twists on its blood supply, cutting off circulation. This is a surgical emergency; prompt treatment is needed to save the ovary.
- Cyst rupture — a cyst bursts, which can cause sudden sharp pain and occasionally significant internal bleeding.
Do not wait to see if severe pain settles — these conditions need urgent assessment.
Cancer risk and who needs closer evaluation
The large majority of ovarian cysts are benign, particularly simple functional cysts in younger women. However, the risk of a cyst being cancerous is higher in postmenopausal women, and ovarian cysts are generally less common after menopause. Features that prompt closer evaluation include large size, solid or complex appearance on ultrasound, rapid growth, or worrying symptoms. A blood test called CA-125 may be used alongside ultrasound — mainly to help assess risk in postmenopausal women — but it is not a standalone screening test, as it can be raised by many benign conditions. Your doctor weighs your age, scan findings and symptoms together.
Diagnosis and treatment in Singapore
Pelvic ultrasound is the main test — it shows the cyst’s size and whether it is simple (fluid-filled) or complex (with solid areas). It may be done over the abdomen and/or transvaginally.
Management depends on your age, the cyst’s appearance and your symptoms:
- Watchful waiting — many simple cysts are monitored with a repeat scan after a few weeks to months to confirm they resolve.
- Surgery — considered for cysts that are large, persistent, causing symptoms, or have suspicious features. Laparoscopic (keyhole) surgery is usual when malignancy risk is low, offering less pain and faster recovery; open surgery (laparotomy) may be needed for large or suspicious cysts.
You can be assessed at a GP or women’s clinic and referred to an O&G specialist at KKH, a SingHealth or NUH centre, or in private practice.
How to prepare for your appointment
A little preparation helps your doctor reach an answer faster. Before you go, note when your symptoms started, where the pain or pressure is felt, and whether it changes across your menstrual cycle. Keep a simple record of your last few periods, including dates, flow and any bleeding between periods.
- List the symptoms that worry you most and how long you have had them.
- Bring details of any previous scans, operations or known cysts.
- Note all medicines you take, including the contraceptive pill or supplements.
- Mention whether you are trying to conceive, as this can influence treatment choices.
If a transvaginal ultrasound is planned, you can usually have it on any day of the cycle, though your clinic may give specific instructions. The scan is generally not affected by light bleeding.
Self-management while you are being assessed
For mild, intermittent discomfort from a simple cyst that is being monitored, a heat pack and simple pain relief such as paracetamol can help. Stay alert to red-flag symptoms and do not ignore sudden, severe one-sided pain. If a cyst has been confirmed and you are waiting for a repeat scan, attend that follow-up even if you feel well, as it is needed to confirm the cyst has resolved.
Common questions
Can an ovarian cyst affect my fertility?
Most simple functional cysts do not affect fertility. Cysts linked to conditions such as endometriosis may have an impact, so discuss any concerns about conceiving with your doctor.
Will I always need surgery?
No. Many cysts are simply watched and resolve on their own. Surgery is reserved for cysts that are large, persistent, symptomatic or have suspicious features.
Can cysts come back after treatment?
Functional cysts can recur because they form with ovulation. Hormonal options are sometimes discussed if cysts are troublesome and recurrent.
Related guides
- Best Gynaecology Clinics in Singapore — our editorial shortlist
- gynaecology clinics directory
- Heavy & painful periods
- Vaginal infections (thrush & BV)
- Contraception & birth control
Sources
- HealthHub (Singapore) – Health A-Z
- SingHealth – Symptoms & Treatments (Gynaecology)
- HealthXchange (SingHealth) – Gynaecological Conditions Q&A
- KK Women's and Children's Hospital (KKH)
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