Article · 4 min read
Kidney Infection (Pyelonephritis)
The signs of a kidney infection, and why prompt treatment matters.
Last updated: 24/9/2026
A kidney infection is a urinary tract infection that has reached the kidneys. It needs prompt treatment.
Signs
- ✓Fever and chills
- ✓Flank or back pain
- ✓Burning on urination
- ✓Nausea
Why it matters
Untreated kidney infections can damage the kidney or spread to the bloodstream, so antibiotics are started promptly.
Frequently Asked Questions
Is a kidney infection an emergency?
It needs prompt medical care — fever with flank pain warrants a doctor visit the same day.
Sources
Related articles
This page is for general education only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified doctor about your specific condition.