Quick answer. Kidney stones can cause severe loin-to-groin pain (renal colic), blood in urine and nausea. Small stones often pass naturally with hydration and pain relief, while larger or obstructing stones need procedures such as ESWL (shockwaves), ureteroscopy with laser, or PCNL for big stones. These procedures are MediSave-claimable under the Table of Surgical Procedures and heavily subsidised at public hospitals – subsidised ESWL day surgery typically runs about S$820-S$1,570 versus roughly S$8,500-S$10,700 in private hospitals. A fever combined with a stone is a medical emergency (possible urosepsis); seek urgent care. Prevention centres on staying well hydrated and reducing salt and oxalate.
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Kidney stones are hard mineral deposits that form in the kidneys and can lodge in the urinary tract, often causing sudden and severe pain. They are common in Singapore, where a hot, humid climate makes dehydration – a key risk factor – easy. The good news is that most stones are highly treatable: small ones frequently pass on their own with fluids and pain relief, and larger stones can be cleared with well-established procedures that are MediSave-claimable and subsidised at public hospitals. This guide explains the symptoms, how stones are diagnosed, your treatment options by stone size, and what they typically cost.
At a glance
| Treatment | Best for | Typical cost (incl. MediSave note) |
|---|---|---|
| Conservative / watchful waiting + medical expulsive therapy | Small stones (under ~5-6 mm) likely to pass | Mainly consultation, imaging and medication (e.g. alpha-blockers); lowest-cost option |
| ESWL (shockwave lithotripsy) | Small-moderate kidney/ureteric stones; non-invasive day surgery | Subsidised public day surgery ~S$820-S$1,570; private ~S$8,500-S$10,700. MediSave-claimable (day surgery) |
| Ureteroscopy (URS) / RIRS with laser | Ureteric stones and many kidney stones; no external incision | Private surgeon fee benchmark ~S$5,700-S$8,500 plus hospital/anaesthesia; lower if subsidised. MediSave-claimable |
| PCNL (percutaneous nephrolithotomy) | Large/complex kidney stones (>~20 mm); short inpatient stay | Subsidised public inpatient ~S$2,600-S$4,900; private surgeon fee benchmark ~S$8,200-S$13,400 plus hospital costs. MediSave-claimable |
| Diagnosis (CT KUB / ultrasound / urine & blood tests) | Confirming size, location and complications | Charged separately; varies by clinic/hospital. Subsidised rates apply at public hospitals |
Symptoms and when it's an emergency
The hallmark symptom is renal colic – intense, cramping pain that often starts in the loin (flank) and radiates to the groin as the stone moves down the ureter. Pain may come in waves and is frequently accompanied by:
- Blood in the urine (pink, red or brown urine)
- Nausea and vomiting
- A persistent urge to urinate, or pain on urination
- Cloudy or foul-smelling urine
Many small stones cause only mild discomfort or none at all. However, a fever or chills together with a known or suspected stone is a medical emergency. An obstructing stone combined with infection can progress to urosepsis, a life-threatening bloodstream infection, within hours. Go to an emergency department urgently if you have a high fever, uncontrolled pain, persistent vomiting, or are unable to pass urine.
Why kidney stones are common in Singapore
Stones form when urine becomes concentrated, allowing minerals such as calcium oxalate to crystallise. Singapore’s consistently hot and humid climate increases fluid loss through sweat, so people who don’t drink enough are more prone to dehydration and concentrated urine – a leading driver of stone formation. Other contributing factors include a high-salt or high-oxalate diet, low fluid intake, certain medical conditions (such as gout and recurrent urinary infections), family history, and previous stones. People who have had one stone have a meaningfully higher chance of forming another, which is why prevention matters.
How kidney stones are diagnosed
Diagnosis usually combines a clinical assessment with imaging and lab tests:
- CT KUB (kidneys, ureters, bladder) – a non-contrast CT scan is the most accurate test for detecting stones, their size and exact location.
- Ultrasound – often used first for pregnant women and to avoid radiation; good for kidney stones and detecting blockage (hydronephrosis).
- X-ray (KUB) – can show many (radio-opaque) stones and help monitor them.
- Urine and blood tests – to check for infection, blood, kidney function and underlying causes; stones may be sent for analysis.
The size, position and number of stones – along with whether they are blocking the kidney or causing infection – determine which treatment is recommended.
Treatment options by stone size
Conservative management (watchful waiting). Small stones (generally under about 5-6 mm) often pass on their own. Treatment focuses on plenty of fluids, pain relief, and sometimes medical expulsive therapy using an alpha-blocker (such as tamsulosin) to relax the ureter and help the stone pass. Stones are monitored to ensure they clear and don’t cause obstruction or infection.
ESWL (extracorporeal shock wave lithotripsy). A non-invasive procedure that uses focused shockwaves from outside the body to break the stone into tiny fragments that pass out in the urine. It needs no incision and is usually done as day surgery; best for small-to-moderate stones in favourable positions.
Ureteroscopy (URS) / RIRS with laser lithotripsy. A thin scope is passed up through the urethra and bladder to the stone, which is fragmented with a laser and/or removed with a basket. No external incision is needed, and it works well for ureteric stones and many kidney stones.
PCNL (percutaneous nephrolithotomy). For large or complex kidney stones (typically over 20 mm), the surgeon makes a small incision in the back to access the kidney directly and remove the stone. It is the most invasive option and usually requires a short hospital stay.
Cost and MediSave coverage
ESWL, ureteroscopy and PCNL are all listed in MOH’s Table of Surgical Procedures (TOSP), which means they are MediSave-claimable – whether performed as day surgery or as an inpatient. MediSave surgical withdrawal limits are fixed per procedure (ranging from S$240 up to S$5,290 depending on the procedure’s complexity table), with an additional daily limit of up to S$830 for day-surgery hospital charges and up to S$1,130 per day for the first two inpatient days (S$400/day thereafter). At public (restructured) hospitals, eligible patients also receive government subsidies, substantially lowering the bill.
Based on MOH bill benchmarks, subsidised public-hospital bills are far lower than private ones. For example, ESWL day surgery typically costs about S$820-S$1,570 subsidised versus roughly S$8,500-S$10,700 in private hospitals. PCNL inpatient bills run about S$2,600-S$4,900 subsidised, while private surgeon fees alone are benchmarked at around S$8,200-S$13,400. Final costs depend on stone complexity, the number of sessions, hospital and ward class, and your insurance. Always ask for a written cost estimate and check coverage with your insurer and MediSave/MediShield Life.
Preventing kidney stones
Once you’ve had a stone, prevention is important because recurrence is common. Key steps:
- Stay well hydrated – aim to drink enough water to keep urine pale, especially in Singapore’s heat and if you exercise or work outdoors.
- Reduce dietary salt (sodium), which raises calcium in the urine.
- Moderate high-oxalate foods (e.g. spinach, nuts, chocolate, strong tea) if you form calcium-oxalate stones, while keeping normal dietary calcium.
- Limit excess animal protein and maintain a healthy weight.
- Treat recurrent stones with a urologist – stone analysis and metabolic tests can guide targeted prevention and, in some cases, medication.
If you experience severe or persistent flank pain, blood in the urine, or any fever with these symptoms, see a doctor promptly.
Related guides
- Best Urology Clinics in Singapore — our editorial shortlist
- urology clinics directory
- Erectile dysfunction (ED) treatment
- Enlarged prostate (BPH) & PSA screening
- Vasectomy: cost, MediSave & reversal
Sources
- MOH – ESWL for ureteric stone (SG701U) bill benchmarks
- MOH – RIRS/flexible ureteroscopy (SG730K) fee benchmarks
- CPF – Using MediSave for hospitalisation and surgical limits
- NUH – Services for Kidney Stones
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