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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 often form when there is a high amount of acid in your urine. Uric acid stones may be caused by: 1  eating a high protein diet that includes lots of meat. 2  a condition such as gout that prevents the body breaking down certain chemicals. 3  an inherited condition that causes higher levels of acid in the body.