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Protein in the Urine: What It Signals
✓ Fact-checked against sourced references · Editorial standards
Protein in the urine (proteinuria) is an early and important sign of kidney damage — healthy kidneys retain protein in the blood.
Common causes
- Diabetes and high blood pressure
- Glomerulonephritis
- Urinary infection
- Temporary causes such as fever or strenuous exercise
Frequently asked questions
Can proteinuria be reversed?
With treatment of the underlying cause, protein leak often improves.
Sources
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Educational only. This guide is general kidney-care information, not individual medical advice.