In a comprehensive survey the diagnostic and therapeutic problems of pyelonephritis and glomerulonephritis are discussed. The importance of thorough nephrological diagnostics is pointed out. The first section of the paper describes the diagnostic procedures such as x-ray and laboratory work (tubular proteinuria, antibody-coated bacteria) and the chemotherapy in pyelonephritis. The second part deals with glomerulonephritis, the aspects of histological classification, etiology, pathogenesis, diagnostic principles, prognosis, and results of therapy with penicillin G (acute form), corticosteroids, azathioprine, indomethacin, and cyclophosphamide.