what is hh mean
Hereditary hemochromatosis (HH) is the most common form of iron overload syndromes, i.e. diseases in which too much iron builds up in oneâs body. This extra iron is toxic to the body and can damage organs, lead to illness or even death.here are three types of iron overload syndromes: 1  Hereditary hemochromatosis (HH) In this inherited disease, the genes that control the absorption of iron from the intestine are abnormal. 2  This causes the intestine to absorb more iron than the body needs.