Proteinuria may be a sign of renal (kidney) damage. Since serum proteins are readily reabsorbed from urine, the presence of excess protein indicates either an insufficiency of absorption or impaired filtration. Diabetics usually suffer from damaged nephrons and develop proteinuria.
Conditions with proteinuria as a symptom
- nephrotic syndromes (i.e. intrinsic renal failure)
- toxic lesions of kidneys
- Lupus erythematosus
- glomerular diseases, such as membranous glomerulopathy, focal segmental glomerulonephritis, minimal change disease (lipoid nephrosis)