Foamy Urine and Protein
What foamy urine can indicate, and when a urine protein test is worth doing.
Last updated: 2026-09-24
Occasional foamy urine is usually harmless, but persistently foamy urine can be a sign of protein leaking into the urine.
What to check
A simple urine test for protein can clarify whether the foam reflects protein in the urine.
Frequently asked questions
Does foamy urine always mean kidney disease?
No — it can be harmless, but persistent foam is worth a urine protein check.