What Is the Difference Between Hyperthyroidism and Thyrotoxicosis

Hyperthyroidism is characterised by increased thyroid hormone synthesis and secretion from the thyroid gland, whereas thyrotoxicosis refers to the clinical syndrome of excess circulating thyroid hormones, irrespective of the source.

How is thyrotoxicosis different from hyperthyroidism?

Hyperthyroidism refers to increased thyroid hormone synthesis and secretion from the thyroid gland, whereas thyrotoxicosis is characterized by the clinical manifestations of inappropriately high thyroid hormone action in tissues.

What are the main causes of thyrotoxicosis?

The most common cause of thyrotoxicosis is Graves’ disease, followed by toxic multinodular goiter (TMNG) and toxic adenoma (TA)[7]. Other causes include thyroiditis, subacute thyroiditis, painless thyroiditis, and gestational hyperthyroidism.