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A 29-year-old female asked:

how long does it usually take an untreated uti to turn into a kidney infection? can you have a kidney infection w/o fever, but with ab/flank pain?

1 doctor answer2 doctors weighed in
Dr. Janet Roberto
Family Medicine 36 years experience
Kidney infection: Generally a Kidney infection is accompanied by a FEVER and some flank pain. Not all UTIs, even untreated will progress to a Kidney infection. There really is not a particular timeline.

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Last updated Mar 13, 2020
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