Many permanent or temporary conditions can reduce thyroid hormone secretion and cause hypothyroidism. About 95% of hypothyroidism cases occur from problems that start in the thyroid gland. In such cases, the disorder is called primary hypothyroidism. (Secondary hypothyroidism is caused by disorders of the pituitary gland. Tertiary hypothyroidism is caused by disorders of the hypothalamus.)
The two most common causes of primary hypothyroidism are:
Hypothyroidism is the most common type of thyroid disorder, and is the situation where the thyroid fails to make enough thyroid hormone to... Read more »
Source: ADAM Encyclopedia
Hypothyroidism is a condition in which the thyroid gland does not make enough thyroid hormone.See also:Chronic thyroiditis (Hashimoto's... Read more »
Source: HealthCentral Encyclopedia
Hypothyroidism is thyroid hormone deficiency. It can be due to primary disease of the thyroid gland itself or to the lack of stimulation of the... Read more »
Source: ADAM Encyclopedia
Drug-induced hypothyroidism is an underactive thyroid gland due to a reaction from medication. "Drug-induced" means caused or brought on by... Read more »
Source: ADAM Encyclopedia
Primary hypothyroidism is a condition in which a defect in the thyroid gland leads to reduced production of thyroid hormone. Causes, incidence,... Read more »
Source: ADAM Encyclopedia
Hypothyroidism increases the risk for physical and mental problems.Emergency ConditionsMyxedema Coma. Myxedema coma is a rare, life-threatening... Read more »