Kidney Stone Symptoms – Recognize the Signs
Kidney stones often cause severe flank pain, blood in the urine, and nausea. Learn which symptoms indicate kidney stones and when to seek medical attention.
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Kidney stones often cause severe flank pain, blood in the urine, and nausea. Learn which symptoms indicate kidney stones and when to seek medical attention.
What Are Kidney Stones and How Do They Form?
Kidney stones (medically known as nephrolithiasis) are hard deposits made of minerals and salts that form inside the kidneys. They develop when urine contains high concentrations of certain substances – such as calcium, oxalate, or uric acid – that crystallize over time. Kidney stones can range in size from tiny grains to stones several centimeters in diameter.
Common Symptoms of Kidney Stones
Small kidney stones often cause no symptoms and are discovered incidentally. However, when a stone moves into the ureter (the tube connecting the kidney to the bladder), it can trigger significant symptoms:
Pain
- Renal colic: Severe, wave-like pain in the side and back, below the ribs, which may radiate to the lower abdomen, groin, and genitals.
- Pain or burning sensation during urination
- A dull ache or pressure in the kidney area
Urine Changes
- Hematuria: Blood in the urine – the urine may appear pink, red, or brownish.
- Cloudy or foul-smelling urine (a possible sign of an accompanying infection)
- Frequent urge to urinate or difficulty urinating
General Symptoms
- Nausea and vomiting
- Sweating and restlessness
- Fever and chills (in the presence of a urinary tract infection – requires immediate medical attention)
When to Seek Immediate Medical Help
The following symptoms require urgent medical evaluation:
- Severe, persistent flank pain (renal colic)
- Fever combined with back or flank pain – this may indicate a serious kidney infection (pyelonephritis)
- Complete inability to urinate
- Clearly visible blood in the urine
Possible Causes of Kidney Stones
Several factors can contribute to the formation of kidney stones:
- Insufficient fluid intake
- A diet high in oxalate (e.g., spinach, nuts) or animal protein
- Family history of kidney stones
- Metabolic conditions such as gout (elevated uric acid) or hypercalcemia
- Chronic urinary tract infections
- Certain medications
Diagnosis of Kidney Stones
Doctors use several methods to diagnose kidney stones:
- Ultrasound: The first-line imaging method to locate stones
- CT scan: Provides detailed information on the size and position of the stone
- Urine analysis: Detects blood, signs of infection, and stone-forming substances
- Blood tests: Assess kidney function and metabolic values
Treatment of Kidney Stones
Treatment depends on the size, location, and composition of the stone:
- Conservative management: Increased fluid intake, pain relief, and alpha-blockers to relax the ureter – often sufficient for small stones
- Extracorporeal shock wave lithotripsy (ESWL): Non-invasive fragmentation of the stone using sound waves
- Ureteroscopy: A minimally invasive procedure to remove the stone through the urethra
- Percutaneous nephrolithotomy (PCNL): Surgical removal for very large or complex stones
Prevention of Kidney Stones
The risk of recurrence can be significantly reduced by:
- Drinking at least 2–3 liters of fluid per day
- Following a balanced diet low in salt and animal protein
- Limiting foods high in oxalate
- Regular follow-up check-ups with a healthcare provider
References
- Türk C. et al. – EAU Guidelines on Urolithiasis. European Association of Urology (2023). Available at: https://uroweb.org/guidelines/urolithiasis
- Pearle MS, Goldfarb DS, Assimos DG et al. – Medical Management of Kidney Stones: AUA Guideline. Journal of Urology, 2014;192(2):316-324.
- World Health Organization (WHO) – Chronic kidney disease and urolithiasis: global burden and prevention strategies. WHO Technical Report (2022).
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