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Iodine deficiency causes gradual enlargement of the thyroid gland, referred to as a goiter. Poor length growth is apparent as early as the first year of life. Adult stature without treatment ranges from 100 to 160 cm (3 ft 3 in to 5 ft 3 in), depending on severity, sex, and other genetic factors.
One common cause of this is the presence of maternal antibodies that temporarily impair thyroid function for several weeks. [ 5 ] The word "cretinism" is an old term for the state of mental and physical retardation resulting from untreated congenital hypothyroidism, usually due to iodine deficiency from birth because of low iodine levels in the ...
A goitre, or goiter, is a swelling in the neck resulting from an enlarged thyroid gland. [ 1 ] [ 2 ] A goitre can be associated with a thyroid that is not functioning properly. Worldwide, over 90% of goitre cases are caused by iodine deficiency . [ 3 ]
Goiter is the general enlargement of the thyroid that can be associated with many thyroid diseases. The main reason this happens is because of increased signaling to the thyroid by way of TSH receptors to try to make it produce more thyroid hormone. [9] This causes increased vascularity and increase in size (hypertrophy) of the gland. [9]
A low amount of thyroxine (one of the two thyroid hormones) in the blood, due to lack of dietary iodine to make it, gives rise to high levels of thyroid stimulating hormone (TSH), which stimulates the thyroid gland to increase many biochemical processes; the cellular growth and proliferation can result in the characteristic swelling or hyperplasia of the thyroid gland or goiter.
Though the exact cause of myxedema is still unclear, a wealth of research has demonstrated the importance of iodine. [10] In an important study [ 11 ] the researchers showed that in the myxedematous type of cretinism treatment with iodine normalizes thyroid function provided that the treatment is begun early in the postnatal period.
The earlier a person is affected by thyroid disease, the more the development of personality is affected and the bigger the delay from their potential development level. The child gets behind in its cognitive, emotional and sexual growth, which, by itself, also influences its processing abilities of the endocrine disease. [2]
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.