Medically reviewed by the RIIMS nephrology team · Last reviewed: Apr 2026
Why protein leaks into urine, how it is tested, and what foamy urine can signal about your kidney health.
This guide is written for patients and families in plain language. It explains the essentials, what to watch for, and how RIIMS supports you with ethical, report-based, doctor-led care — always alongside, never instead of, your treating doctor.
Why does protein appear in urine?
Healthy kidney filters keep protein in the blood. When filters are inflamed or damaged — by diabetes, blood pressure, infections or kidney-specific diseases — protein escapes into urine. Foamy urine is a common first clue. Urine tests (ACR, 24-hour protein) and blood reports together reveal how significant it is and what is causing it.
Signs to discuss with your doctor
- Foamy or frothy urine
- Swelling around eyes, especially mornings
- Swelling in feet or ankles
- Weight gain from fluid
- Often detected only on routine urine tests
- High blood pressure
When to consult a kidney doctor
Persistent foamy urine, morning facial puffiness, or protein flagged on any routine test deserves timely evaluation — particularly if you have diabetes or hypertension.