Hyperthyroxinemia

Hyperthyroxinemia is a thyroid disease where the serum levels of thyroxine are higher than expected.^[1] Thyroxine or tetraiodothyronine (T4) is produced by the thyroid gland.

Hyperthyroxinemia
Other names	Hyperthyroxinaemia
Thyroxine
Specialty	Endocrinology

The term is sometimes used to refer to hyperthyroidism, but hyperthyroidism is a more general term. ^[2]

When the level of thyroxine (T4) in the blood exceeds normal range, it can lead to symptoms such as irritability and unexplained weight loss.^[3]

Types include:

• Familial dysalbuminemic hyperthyroxinemia
• Familial euthyroid hyperthyroxinemia
• Thyroid hormone resistance syndrome