<Tr> <Th> Specialty </Th> <Td> Endocrinology </Td> </Tr> <Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr> <P> Cretinism is a condition of severely stunted physical and mental growth owing to untreated congenital deficiency of thyroid hormone (congenital hypothyroidism) usually owing to maternal hypothyroidism . </P> <P> Around the world, the most common cause of congenital hypothyroidism is iodine deficiency . Cretinism is therefore most probably due to a diet deficient in iodine . It has affected many people worldwide and continues to be a major public health problem in many countries . Iodine is an essential trace element, necessary primarily for the synthesis of thyroid hormones . Iodine deficiency is the most common preventable cause of brain damage worldwide . Although iodine is found in many foods, it is not universally present in all soils in adequate amounts . Most iodine, in iodide form, is in the oceans where the iodide ions oxidize to elemental iodine, which then enters the atmosphere and falls to earth as rain, introducing iodine to soils . Earth deficient in iodine is most common inland and in mountainous areas and areas of frequent flooding, but can also occur in coastal regions owing to past glaciation, and leaching by snow, water and heavy rainfall, which removes iodine from the soil . Plants and animals grown in iodine deficient soils are correspondingly deficient . Populations living in those areas without outside food sources are most at risk of iodine deficiency diseases . </P>

A cretin is an individual who lacks which hormone