Article · 4 min read
Protein in Urine (Proteinuria): What It Signals
Why protein leaks into urine and what proteinuria means for kidney health.
Last updated: 24/9/2026
Protein in the urine (proteinuria) is an early and important sign of kidney damage — healthy kidneys keep protein in the blood.
Common causes
- ✓Diabetes and high blood pressure
- ✓Glomerulonephritis
- ✓Urinary infection
- ✓Temporary causes like fever or heavy exercise
Testing
A urine albumin test measures the leak. Persistent proteinuria needs follow-up with a nephrologist.
Frequently Asked Questions
Can proteinuria be reversed?
With treatment of the cause, protein leak often improves.
Sources
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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.