What are the signs of proteinuria and kidney failure?

Large amounts of protein in your urine may cause it to look foamy in the toilet. Also, because the protein has left your body, your blood can no longer soak up enough fluid and you may notice swelling in your hands, feet, abdomen, or face. These are signs of very large protein loss. More commonly, you may have proteinuria without noticing any signs or symptoms. Testing is the only way to find out how much protein you have in your urine.

source: http://kidney.niddk.nih.gov/kudiseases/pubs/proteinuria/index.htm