Urinary stones are a common urological condition in Singapore and can affect individuals of all ages. While some stones pass without causing symptoms, others can lead to sudden pain, urinary discomfort or complications that require medical attention.
This guide provides a clear overview of urinary stones, including how they form, common symptoms, diagnostic approaches and treatment options available. By gaining clarity on these aspects, patients can better recognise when a specialist assessment is appropriate and make informed decisions about managing both current symptoms and future recurrence risks.
What Are Urinary Stone
Urinary stones are solid mineral deposits that form within the urinary tract when certain substances in urine become highly concentrated and crystallise. Urinary stones can be classified based on where they form within the urinary tract.
Stones may develop in the kidneys, where they are known as kidney stones, and may remain there or migrate into the ureters, becoming ureteric stones that often cause acute pain. Less commonly, stones can form in the bladder, usually in association with incomplete bladder emptying or underlying urinary tract conditions.
Types of Urinary Stones
Calcium Stones
- Usually composed of calcium oxalate, though some are formed from calcium phosphate
- Develop when calcium combines with oxalate or phosphate in concentrated urine
- Contributing factors may include high sodium intake, certain dietary habits, metabolic conditions and excessive supplementation
Uric Acid Stones
- Form when urine contains high levels of uric acid and remains persistently acidic
- May occur alone or alongside calcium stones
- Risk factors include diets high in purines (found in certain meats and seafood), gout, genetic predisposition and some medical treatments
Struvite Stones
- Less common and usually associated with urinary tract infections
- Caused by certain bacteria that alter urine chemistry and promote stone formation
- Can grow rapidly and may become large if untreated
Cystine Stones
- Rare stones caused by a hereditary condition known as cystinuria
- Occur when the kidneys excrete excessive amounts of the amino acid cystine into the urine
- Management often includes maintaining high fluid intake and dietary salt restriction
Signs and Symptoms of Urinary Stones
Symptoms of urinary stones can range from mild discomfort to severe pain, depending on stone size, location and degree of obstruction.
Common symptoms include:
Sudden flank pain
Blood in the urine (haematuria)
Nausea or vomiting associated with pain
Pain or burning during urination
Frequent or urgent urination
Some stones cause intermittent symptoms, while others remain silent until complications develop. Persistent pain, visible blood in the urine, or an associated fever should prompt a timely medical evaluation to avoid complications, such as infection or kidney damage.
Causes & Risk Factors
Urinary stones form due to a combination of environmental and individual factors. Inadequate hydration is one of the most significant contributors, particularly in warm climates where fluid loss is higher.
Common risk factors include:
- Diets high in sodium, animal protein or oxalate-rich foods
- Low daily fluid intake
- Family history of stone disease
- Metabolic conditions affecting calcium or uric acid balance
- Certain medical conditions and medications can also increase stone risk
How Stones Are Diagnosed
Diagnosis begins with a clinical assessment and review of symptoms. Laboratory tests are often used to evaluate kidney function, infection markers and metabolic contributors.
Investigations may include:
- Blood tests to assess kidney function and mineral levels
- Urinalysis to detect blood, infection or crystals
- Imaging, such as ultrasound or CT scans, to determine stone size and location
Imaging plays a crucial role in guiding treatment decisions, as stone size and position significantly influence whether conservative management or intervention is recommended.
Treatment Options
Urinary stone treatment in Singapore is tailored to the individual based on stone size, location, symptoms, and patient-specific factors. Management ranges from conservative measures for small stones to minimally invasive procedures for larger or persistent stones.
For smaller stones, treatment may include:
- Home-based measures, such as increasing fluid intake to encourage stone passage
- Pain relief, commonly with non-steroidal anti-inflammatory drugs (NSAIDs), to manage discomfort
- Medical expulsive therapy, where medications such as alpha-blockers are used to relax the ureter and help certain stones pass more easily
For larger stones or ongoing symptoms, interventional treatments may be recommended:
- Lithotripsy, which uses shock waves to break stones into smaller fragments that can pass naturally
- Ureteroscopy with laser lithotripsy, where stones are removed or fragmented using a thin scope passed through the urinary tract
- Percutaneous nephrolithotomy (PCNL), reserved for large or complex kidney stones that are not suitable for other treatments
Comprehensive Treatment at URODOC
As a specialist urology clinic, URODOC adopts a structured and individualised approach to the evaluation and management of kidney and urinary stones. Care is focused on accurately identifying stone size, location and composition, so that treatment decisions are appropriate, effective, and proportionate to the condition.
A consultation with Dr Lee Fang Jann, a urologist and renal transplant surgeon with experience in kidney stone disease, helps patients understand their diagnosis. It also provides the opportunity to discuss available treatment options and clarify recovery and prevention strategies. Management decisions are then guided by clinical findings and long-term urinary health considerations.
When to Seek Urgent Care
Untreated urinary stones may lead to complications such as urinary obstruction, infection or impaired kidney function. Urgent medical attention is required if symptoms include:
- Fever with urinary pain
- Severe or unrelenting pain
- Reduced or absent urine output
Prompt assessment is important to prevent infection-related complications and long-term kidney damage.
Prevention Strategies
Preventing recurrence is a key component of long-term stone management. Many patients experience repeated stones without targeted preventive measures.
General strategies include:
- Increasing daily fluid intake to maintain dilute urine
- Moderating sodium and animal protein intake
- Adjusting dietary oxalate based on stone type
- Addressing metabolic abnormalities where present
Stone analysis and metabolic evaluation help tailor prevention plans. Long-term follow-up focuses on reducing recurrence risk rather than treating repeated episodes.
Cost Guide for Urinary Stone Treatments
Costs associated with kidney and urinary stone management vary depending on the type of treatment recommended, the size and complexity of the stone, and whether care is provided on an outpatient or inpatient basis. These factors are assessed during consultation to determine the most appropriate and cost-effective approach for each patient.
Cost considerations may include:
- Initial specialist consultation and diagnostic imaging, such as ultrasound or CT scans
- The type of procedure required, including facility and hospital charges, where applicable
- Length of hospital stay for inpatient procedures
- Follow-up consultations, repeat imaging or additional investigations to confirm stone clearance
Insurance and Medisave applicability depend on individual circumstances, stone-related factors and the treatment modality used. These aspects are typically discussed during consultation to ensure transparency and allow patients to plan their care with a clear understanding of what is involved.
Frequently Asked Questions (FAQ)
Will urinary stones pass on their own?
Some small stones may pass naturally, depending on their size and location.
How likely are stones to come back?
Recurrence is common without targeted prevention measures.
Do all urinary stones require surgery or lithotripsy?
No. Treatments such as lithotripsy in Singapore are considered based on stone size, symptoms and risk of complications.
When should I see a specialist?
Persistent pain, blood in the urine or fever should prompt medical review.
Can urinary stones be prevented?
Yes. Hydration, dietary changes and follow-up reduce recurrence risk.
Get Specialist-Guided Treatment for Urinary Stones
Urinary stones are a common condition with varying presentations and treatment needs. Accurate diagnosis and individualised management are essential to relieve symptoms, prevent complications and reduce recurrence risk.
At URODOC, patients are supported through each stage of evaluation, treatment, and recovery with a focus on clarity, safety and informed choice. If uncertainty about treatment options or the risk of recurrence is a concern, a specialist consultation with Dr Lee Fang Jann can help clarify the diagnosis and guide appropriate management. Through detailed discussion and assessment, patients can move forward with clarity and confidence.
