Cystinuria is a genetic disorder that affects the kidneys, leading to the formation of cystine stones. This condition occurs when the body does not properly reabsorb the amino acid cystine, causing it to accumulate in the urine. As a result, cystine can crystallize and form stones, which may cause pain and urinary issues. People with cystinuria may experience symptoms such as abdominal pain, blood in urine, and frequent urination. Treatment often involves increasing fluid intake to dilute the urine and prevent stone formation. In some cases, medications may be prescribed to help manage the condition and reduce stone recurrence.