Hyperthyroxinemia is a

thyroid disease Thyroid disease is a medical condition that affects the function of the thyroid gland. The thyroid gland is located at the front of the neck and produces thyroid hormones that travel through the blood to help regulate many other organs, meaning ...

where the serum levels of

thyroxine File:Thyroid_system.svg, upright=1.5, The thyroid system of the thyroid hormones T3 and T4 rect 376 268 820 433 Thyroid-stimulating hormone rect 411 200 849 266 Thyrotropin-releasing hormone rect 297 168 502 200 Hypothalamus rect 66 216 386 25 ...

are higher than expected.

Thyroxine File:Thyroid_system.svg, upright=1.5, The thyroid system of the thyroid hormones T3 and T4 rect 376 268 820 433 Thyroid-stimulating hormone rect 411 200 849 266 Thyrotropin-releasing hormone rect 297 168 502 200 Hypothalamus rect 66 216 386 25 ...

or tetraiodothyronine (T4) is produced by the thyroid gland. The term is sometimes used to refer to

hyperthyroidism Hyperthyroidism is the condition that occurs due to excessive production of thyroid hormones by the thyroid gland. Thyrotoxicosis is the condition that occurs due to excessive thyroid hormone of any cause and therefore includes hyperthyroidis ...

, but hyperthyroidism is a more general term. When the level of

(T4) in the blood exceeds normal range, it can lead to symptoms such as irritability and unexplained weight loss. Types include: * Familial dysalbuminemic hyperthyroxinemia * Familial euthyroid hyperthyroxinemia * Thyroid hormone resistance syndrome

References

External links

Thyroid disease {{endocrine-disease-stub