[Hemochromatosis].

The first part of this study deals with well known as well as new data on normal iron metabolism. The second part will concern Genetic Haemochromatosis, a recessively transmitted disease principally determined by a gene located on the sixth chromosome near the A locus of HLA system: phenotypic expression of the gene, clinical features, iron overload assessment, mechanism of iron toxicity, pathogenesis of iron overload. The third part considers iron overload secondary to anaemias, to chronic alcoholic liver diseases, to porphyria cutanea tarda, to chronic haemodialysis... and their relation to the Genetic Haemochromatosis. Beyond what is already well established still lies a large number of questions with answers, at this stage, uncertain or incomplete.