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Congenital hypothyroidism can also occur due to genetic defects of thyroxine or triiodothyronine synthesis within a structurally normal gland. Among specific defects are thyrotropin ( TSH ) resistance, iodine trapping defect, organification defect, thyroglobulin , and iodotyrosine deiodinase deficiency.
Congenital iodine deficiency syndrome (CIDS), also called cretinism, [2] is a medical condition present at birth marked by impaired physical and mental development, due to insufficient thyroid hormone production (hypothyroidism) often caused by insufficient dietary iodine during pregnancy.
Thyroid dysgenesis is a cause of congenital hypothyroidism [1] where the thyroid is missing (thyroid agenesis), ectopic, or severely underdeveloped.It should not be confused with iodine deficiency, or with other forms of congenital hypothyroidism, such as thyroid dyshormonogenesis, where the thyroid is present but not functioning correctly.
Untreated cases of hypothyroidism during pregnancy can lead to delays in growth and intellectual development in the baby or congenital iodine deficiency syndrome. [ 5 ] Worldwide, too little iodine in the diet is the most common cause of hypothyroidism.
Iodine deficiency is a lack of the trace element iodine, an essential nutrient in the diet.It may result in metabolic problems such as goiter, sometimes as an endemic goiter as well as congenital iodine deficiency syndrome due to untreated congenital hypothyroidism, which results in developmental delays and other health problems.
Thyroid dyshormonogenesis is a rare condition due to genetic defects in the synthesis of thyroid hormones. [1] [2] It is due to either deficiency of thyroid enzymes, inability to concentrate, or ineffective binding.
In the United States, autoimmune inflammation is the most common form of thyroid disease while worldwide hypothyroidism and goiter due to dietary iodine deficiency is the most common. [ 35 ] [ 4 ] According to the American Thyroid Association in 2015, approximately 20 million people in the United States alone are affected by thyroid disease.
Hypothyroidism is common in pregnancy with an estimated prevalence of 2-3% and 0.3-0.5% for subclinical and overt hypothyroidism respectively. [8] Endemic iodine deficiency accounts for most hypothyroidism in pregnant women worldwide while chronic autoimmune thyroiditis is the most common cause of hypothyroidism in iodine sufficient parts of the world.