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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.
Fibrous tissue may be found throughout the affected thyroid as well. [5] In late stages of the disease, the thyroid may be atrophic. [10] Severe thyroid atrophy presents often with denser fibrotic bands of collagen that remains within the confines of the thyroid capsule. [60]
Hypothyroidism is classified as either primary, secondary, or tertiary. Primary hypothyroidism is for when the cause is due to an abnormality of the thyroid gland, secondary hypothyroidism is when the cause is decreased thyroid-stimulating hormone levels, and tertiary hypothyroidism is when the cause is an inadequate amount of thyrotropin-releasing hormone being released.
In 1971, the thyroid stimulating hormone (TSH) radioimmunoassay was developed, which was the most specific marker for assessing thyroid status in patients. [82] Many people who were being treated based on basal metabolic rate, minimizing hypothyroid symptoms, or based on serum protein-bound iodine, were found to have excessive thyroid hormone. [82]
However, this disease was less mentioned in medical books because it was erroneously considered to be an aesthetic rather than a clinical disorder. [18] Congenital iodine-deficiency syndrome was especially common in areas of southern Europe around the Alps and was often described by ancient Roman writers and depicted by artists.
Ord's thyroiditis is an atrophic form of chronic thyroiditis, an autoimmune disease where the body's own antibodies fight the cells of the thyroid. It is named after the physician, William Miller Ord, who first described it in 1877 and again in 1888. It is more common among women than men.
The thyroid hormones have a wide range of effects on the human body. These include: Metabolic. The thyroid hormones increase the basal metabolic rate and have effects on almost all body tissues. [26] Appetite, the absorption of substances, and gut motility are all influenced by thyroid hormones. [27]
Most patients with autoimmune polyendocrine syndrome type 3 have autoimmune thyroid diseases associated with only one other autoimmune disease; these associations are most frequently with either type 1 diabetes (20–30% of cases) [5] or chronic atrophic gastritis (39 percent of cases). [6]