A case of IgA nephropathy associated with marked hematuria after upper respiratory tract infections.

IgA nephropathy is characterized by recurrent hematuria which is occasionally associated with upper respiratory infections. Since serial follow-up of IgA nephropathy has not been reported, a 43 year old patient who showed a typical course of this disease is described. Hematuria was markedly increased each time after upper respiratory infections. Renal biopsy revealed typical features of IgA nephropathy by light and immunofluorescent microscopy. Marked hematuria subsided after administration of antibiotics. Upper respiratory tract infections might be a risk factor in some patients with IgA nephropathy. In some patients upper respiratory tract infections may exacerbate IgA nephropathy.