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Hello Anonymous,

Welcome to EmpowHER.

Kidney or flank pain typically feels like a dull ache on one side of your upper back. It can be caused by a number of different infections or injuries.

The most common causes of flank or kidney pain are:

Kidney stones
Pyelonephritis — kidney infection
Polycystic kidney disease
Kidney infarction
Hemorrhage of the kidney
Kidney cancer or tumor
Renal vein thrombosis

Regards,
Maryann