Let's Compare Hyperthyroidism and Hypothyroidism


Hyperthyroidism, often referred to as an 'overactive thyroid', is a condition in which the thyroid gland produces and secretes excessive amounts of the free (not protein bound, and circulating in the blood) thyroid hormones, triiodothyronine (T3) and/or thyroxine (T4).

hyperthyroidism n : an overactive thyroid gland; pathologically excessive production of thyroid hormones or the condition resulting from excessive production of thyroid hormones [syn: {thyrotoxicosis}] [ant: {hypothyroidism}]

hyperthyroidism \hyperthyroidism\ n. (Med.) An abnormality of the thyroid gland characterized by the pathologically excessive production of thyroid hormones; -- also, the resulting condition characterized by increased metabolism, weight loss, rapid heart rate, high blood pressure, an enlarged thyroid gland and sometimes exophthalmos. It leads to, and may be confirmed by, high plasma levels of triiodothyronine or thyroxin. Syn: thyrotoxicosis. [WordNet 1.5]


Hypothyroidism is a state in which the thyroid gland does not make enough thyroid hormone.

hypothyroidism n : an underactive thyroid gland; a glandular disorder resulting from insufficient production of thyroid hormones [ant: {hyperthyroidism}]

Data Sources:

  • hyperthyroidism: WordNet (r) 2.0
  • hyperthyroidism: The Collaborative International Dictionary of English v.0.44
  • hypothyroidism: WordNet (r) 2.0

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Your Comparisons - Hyperthyroidism And Hypothyroidism