If kidney stones get too large, they can cause severe flank pain and hydronephrosis because they block the:

URETER. They block the process of urine formation If kidney stones get too large, he can cause severe flank pain and hydronephrosis. also blocked ureter can cause urine to go back up into the kidney, which causes swelling. In this Case urine flows through the urinary tract with minimal pressure and Pressure can build up if there’s an obstruction in the urinary tract.

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