Blockage / infection: Blockage from kidney stone or other form of obstruction can be very painful & increases with fluid load to kiden. Pyelonephritis, kidney infection, can also be painful & tender. Kidney trauma or rupure. Hemorrage into malignant or benign kidney tumor. Large kidney cyst. Occasionally glomerulonephritis, an autoimmune inflammatory condition of kidney.
Answered 9/18/2013
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