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Renal tubular acidosis, a kidney condition that makes the urine more acidic. Kidney stones form more easily in acidic urine. ... Uric acid, calcium oxalate, and cystine stones form more readily in acidic urine, so this prevention strategy hinges on keeping the urine slightly alkaline.
Uric acid stones. Some kidney stones are made of uric acid, a waste product normally passed out of the body in the urine. You are more likely to have uric acid stones if you have: 1  Low urine output. 2  A diet high in animal protein, such as red meat. 3  An increase in how much alcohol you drink. 4  Gout. 5  Inflammatory bowel disease.