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If hemochromatosis is iron overload and there is excess iron in the blood, why does the liver reduce hepcidin secretion (which increases the iron uptake) furthering the worsening of hemochromatosis?

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From what I remember it all depends on which type of hemochromatosis we are talking about. There are several types depending on the cause and some of those like the hemojuvelin gene mutation-related have low levels of hepcidin as the CAUSE of the hemochromatosis (since like you mentioned, seeing it as a consequence wouldn't make much sense) The first 4 pages of this paper should clear things up a little bit https://www.aasld.org/sites/default/files/guideline_documents/Hemochromatosis2011.pdf

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