HH is caused by multiple genetic defects like HFE, TfR2, HJV, TMPRSS6, FPN1, and HAMP. According to different mutant genes, HH is divided into HFE hemochromatosis (type1), juvenile hemochromatosis (type 2), TfR2 hemochromatosis (type 3), and ferroportin hemochromatosis. This evidence concerns the gene HJV and hemochromatosis.