Kidney Stones Types

 Different Types of Kidney Stones

Kidney stones (renal calculi) are hard mineral and salt deposits that form inside the kidneys when urine becomes concentrated. There are several types of kidney stones, each with different causes, risk factors, and prevention strategies.
1. Calcium Stones
Calcium stones are the most common type, accounting for about 70–80% of cases. They are usually made of calcium oxalate, and less commonly calcium phosphate. Risk factors include dehydration, high oxalate intake (such as spinach, nuts, and chocolate), excess sodium, and certain metabolic conditions. Adequate hydration and balanced calcium intake can help reduce risk.
2. Uric Acid Stones
Uric acid stones form when urine is persistently acidic. They are more common in people with gout, those who consume a high-purine diet (red meat, organ meats, shellfish), and individuals with chronic diarrhea or dehydration. Unlike calcium stones, uric acid stones may be prevented or dissolved by alkalinizing the urine and increasing fluid intake.
3. Struvite Stones
Struvite stones are associated with chronic urinary tract infections caused by urease-producing bacteria. These stones can grow rapidly and become large, sometimes forming “staghorn” calculi that fill parts of the kidney. Treatment often requires antibiotics and, in many cases, surgical removal.
4. Cystine Stones
Cystine stones are rare and occur in people with a genetic disorder called cystinuria, which causes excess cystine to leak into the urine. These stones tend to form at a younger age and may recur frequently. Management includes high fluid intake, urine alkalinization, and specialized medications.



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