"Kidney inflammation" describes two distinct conditions, and both their causes and their courses differ:

1. Pyelonephritis: A Bacterial Kidney Infection

This is a urinary tract infection that has reached the kidney. It presents with high fever, chills, flank/back pain, vomiting, and, in infants, fever with no identifiable cause. It is diagnosed with a urine culture and treated with antibiotics; in young infants, hospitalization for intravenous treatment may be necessary. Because recurrent pyelonephritis can cause permanent kidney damage, underlying causes (such as urinary reflux/VUR) are investigated with imaging in children who have had it.

2. Glomerulonephritis: Inflammation of the Kidney's Filtering Units

It is not the microbe itself but the immune response that affects the kidney. The classic example in children is acute post-streptococcal glomerulonephritis, which develops 1–3 weeks after a strep infection:

  • Tea/cola-colored urine (blood in the urine)
  • Swelling of the eyelids and face (especially in the mornings)
  • Decreased urine output
  • High blood pressure, headache

This condition requires urgent evaluation; most children recover fully, but follow-up is essential. The full 10-day course of treatment for strep is a reminder of how important this complication is.

If Protein and Blood Are Detected in the Urine

Protein/blood found on a routine test does not always mean disease; a feverish period and exercise can cause temporary changes. With recurrent abnormalities, a protein in the urine evaluation is performed.

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Related articles: UTI · Strep · Kidney diseases

This article is for general information purposes only; it does not replace diagnosis and treatment. For any concerns about your child's health, be sure to consult a pediatric specialist.

Uzm. Dr. Hasan Keleş — Specialist in Pediatric Health and Diseases, Gaziantep