What Is a Kidney Infection? Symptoms, Causes, Diagnosis, Treatment, and Prevention

Kidney infection, also called pyelonephritis, occurs when effective bacteria reach your kidneys as part of a urinary tract infection (UTI). Most UTIs affect the lower part of your urethra, your urethra and bladder. Sometimes an infection that starts there goes into your upper urinary tract, affecting one or both kidneys. If bacteria enter your body …

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