Primary hypothyroidism develops when damage ... when it detects that the thyroid has produced enough T3 and T4. Secondary hypothyroidism occurs when thyroid levels are too low due to problems ...

The causes of primary versus secondary hyperthyroidism differ. Thyroid problems cause primary hyperthyroidism while problems in the pituitary gland cause secondary hyperthyroidism. Hyperthyroidism ...

(1) Hypothyroidism can also be classified as primary or secondary. Primary hypothyroidism occurs when your body does not produce enough thyroid hormone naturally. Secondary hypothyroidism occurs ...

Primary vs secondary hypothyroidism. The majority of women with hypothyroidism have primary hypothyroidism, which is most commonly due to chronic autoimmune thyroid disease (the goiter form of ...

Adolescents and young adults (AYAs) who develop thyroid cancer as a secondary cancer have a significantly greater risk of dying than those who have a primary thyroid cancer, according to a new study.

Secondary malignant neoplasms, compared with primary thyroid cancers, were significantly more likely to be multifocal microcarcinomas less than 1 cm with tall/columnar cells, with cases occurring ...