Pyelonephritis: An infection of the kidney (pyelonephritis) results in severe back pain, high fever and nausea/vomiting. Unlike an infection only involving the bladder, the ascension of bacteria into the kidney is a dangerous event. If you have these symptoms it is important to see a doctor and have your urine tested. Untreated pyelonephritis can result in permanent kidney damage, blood infection or shock.
Answered 12/10/2013
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