Kidney stones (also called renal calculi, nephrolithiasis or urolithiasis) are hard deposits made of minerals and salts that form inside the kidneys. They can affect any part of the urinary tract from the kidneys to the urinary bladder; often the stones form when urine becomes concentrated, allowing minerals to cyrstallize and stick together.
The worldwide prevalence of kidney stones is 10% with an annual incidence of 1%. This prevalence has been increasing over the years. However, this prevalence is higher in hot, arid, or dry climates, such as mountains, desert, or tropical areas.
Prevalence of kidney stones is also directly correlated with type 2 diabetes, obesity, and variation measures of adiposity variables, including higher waist circumference, and BMI in both sexes.
Types of Kidney Stones.
Type of stone | Prevalence |
Calcium Oxalate | 80% |
Calcium Phosphate | 5-10% |
Uric acid | 5-10% |
Struvite | 10-15% |
Cystine | 1-2% |