Kidney stones are hard mineral deposits that form inside the kidneys — and the single most common thread behind them is concentrated urine from too little fluid.
When urine contains more crystal-forming substances (calcium, oxalate, uric acid) than the fluid can dilute, crystals clump and grow. Hot climates, sweating heavily, and chronically low water intake all concentrate urine.
High salt intake increases calcium in urine. Very high-oxalate foods (spinach, beetroot, nuts, chocolate, strong tea) can contribute in susceptible people. Sugary colas and very high animal-protein diets are also frequently linked.
Small stones may pass silently. Larger ones can cause waves of severe side or back pain, blood in urine, nausea, or pain while urinating. Fever with stone pain is an emergency signal.
Producing roughly 2–2.5 litres of urine daily (which means drinking generously through the day, especially in Indian summers) is the most consistently supported preventive habit. Normal dietary calcium is fine — cutting calcium can backfire.
This article is educational and general. Your situation has its own context — for symptoms that are severe, sudden, persistent or worrying, consult a qualified medical practitioner.
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