hyperthyroidism
noun
hy·per·thy·roid·ism
ˌhī-pər-ˈthī-ˌrȯi-ˌdi-zəm 
: excessive functional activity of the thyroid gland
also
: the resulting condition marked especially by increased metabolic rate, enlargement of the thyroid gland, rapid heart rate, and high blood pressure
Examples of hyperthyroidism in a Sentence
Recent Examples on the Web
Several conditions can occur with the thyroid, including hyperthyroidism, hypothyroidism, tumors, cancer, or postpartum thyroiditis.
—
Alyce Collins, MSNBC Newsweek, 25 Aug. 2025
By identifying changes in your cat's litter box behavior, the monitor can alert you to potential health issues such as urinary tract infections, kidney disease, diabetes, hyperthyroidism and obesity, allowing for early veterinary intervention.
—Jené Luciani Sena
May Earn A Commission If You Buy Through Our Referral Links. This Content Was Created By A Team That Works Independently From The Fox Newsroom., FOXNews.com, 18 June 2025
Graves' disease is an autoimmune condition that causes hyperthyroidism, the overproduction of thyroid hormone.
—Wesley Stenzel, EW.com, 14 June 2025
Per the Cleveland Clinic, the autoimmune disorder affects the thyroid gland, resulting in the overproduction of the thyroid hormone, also known as hyperthyroidism, the most common cause of which is Graves’ disease.
—Natalie Oganesyan, Deadline, 14 June 2025
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Alyce Collins, MSNBC Newsweek, 25 Aug. 2025
By identifying changes in your cat's litter box behavior, the monitor can alert you to potential health issues such as urinary tract infections, kidney disease, diabetes, hyperthyroidism and obesity, allowing for early veterinary intervention.
—Jené Luciani Sena
May Earn A Commission If You Buy Through Our Referral Links. This Content Was Created By A Team That Works Independently From The Fox Newsroom., FOXNews.com, 18 June 2025
Graves' disease is an autoimmune condition that causes hyperthyroidism, the overproduction of thyroid hormone.
—Wesley Stenzel, EW.com, 14 June 2025
Per the Cleveland Clinic, the autoimmune disorder affects the thyroid gland, resulting in the overproduction of the thyroid hormone, also known as hyperthyroidism, the most common cause of which is Graves’ disease.
—Natalie Oganesyan, Deadline, 14 June 2025
See All Example Sentences for hyperthyroidism
Cite this Entry
“Hyperthyroidism.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hyperthyroidism. Accessed 5 Sep. 2025.
Copy CitationKids Definition
hyperthyroidism
noun
hy·per·thy·roid·ism
ˌhī-pər-ˈthī-ˌrȯid-ˌiz-əm
-rəd-
: abnormally high activity of the thyroid gland
also
: the resulting abnormal state of health
hyperthyroid
adjective
-ˌrȯid
Medical Definition
hyperthyroidism
noun
hy·per·thy·roid·ism
-ˌrȯid-ˌiz-əm, -rəd-
: excessive functional activity of the thyroid gland
also
: the resulting condition marked especially by increased metabolic rate, enlargement of the thyroid gland, rapid heart rate, and high blood pressure
called also thyrotoxicosis
see graves' diseaseLove words? Need even more definitions?
Merriam-Webster unabridged
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