What does hyperthyroid mean?
Hyperthyroid is an adjective describing an overactive thyroid gland or someone affected by hyperthyroidism, a condition in which the thyroid produces too much hormone. The excess can affect energy, weight, heart rate, body temperature, mood, and sleep, although symptoms and severity vary. In medical writing, the term may modify symptoms, a state, a test result, or a diagnosis: for example, “hyperthyroid symptoms” or “a hyperthyroid patient.” The related noun is “hyperthyroidism,” while the opposite condition is hypothyroidism, in which the thyroid is underactive. Hyperthyroid should not be used as a synonym for merely energetic or nervous, since it refers to a specific medical condition. Its use is primarily formal and clinical, though the adjective is widely understood.
adjectiveRelating to or affected by an overactive thyroid gland and the resulting excess of thyroid hormones. The related condition is called hyperthyroidism.
- Relating to an overactive thyroid gland or to the condition of hyperthyroidism.
- Affected by hyperthyroidism.
"Her hyperthyroid symptoms included weight loss, rapid heartbeat, and difficulty sleeping."
"The test results suggested a hyperthyroid state rather than a hypothyroid one."
"She was diagnosed as hyperthyroid after reporting unexplained weight loss and tremor."
When the thyroid gland is described as “hyper,” it is working too hard, and the resulting hormonal surge can make the whole body feel wired.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does hyperthyroid come from?
The English word combines the prefix hyper-, meaning “over” or “excessive,” with thyroid, from Greek words referring to the shield-shaped cartilage at the front of the larynx. The medical adjective developed in the 19th century alongside the term hyperthyroidism. The root is shared by related forms such as thyroxine, thyroiditis, and thyroglobulin.
Related word forms
How hyperthyroid is actually used
The term is primarily medical. In general usage, “hyperthyroid” may informally describe a person with an overactive thyroid, but “person with hyperthyroidism” is more precise.
Easily confused with hyperthyroid
Hyperthyroid describes an overactive thyroid and excess thyroid hormone, whereas hypothyroid describes an underactive thyroid and insufficient thyroid hormone.