[4][5] It can be the result of mistaken ingestion of excess drugs, such as levothyroxine[6] and triiodothyronine,[7] or as a symptom of Munchausen syndrome.
Patients present with hyperthyroidism and may be mistaken for Graves’ disease, if TSH receptor positive, or thyroiditis because of absent uptake on a thyroid radionuclide uptake scan due to suppression of thyroid function by exogenous thyroid hormones.
[8] Ingestion of thyroid hormone also suppresses thyroglobulin levels helping to differentiate thyrotoxicosis factitia from other causes of hyperthyroidism, in which serum thyroglobulin is elevated.
In such cases, increased fecal thyroxine levels in thyrotoxicosis factitia may help differentiate it from other causes of hyperthyroidism.
This article about an endocrine, nutritional, or metabolic disease is a stub.