HAMP and iron metabolism disease: Recent studies have suggested that iron metabolism disorders may be involved in the pathogenesis of acute respiratory distress syndrome and multiple organ dysfunction in coronavirus disease 2019 (COVID-19).<h4>Objectives</h4>To re-evaluate the hepcidin-related iron metabolism parameters and explore the relationship between hepcidin-mediated iron dysmetabolism and COVID-19 severity.<h4>Methods</h4>COVID-19 is classified as mild and moderate as non-severe, severe and critical as severe.