Thyrotoxicosis factitia (alimentary thyrotoxicosis, exogenous thyrotoxicosis)[1][2] refers to a condition of thyrotoxicosis caused by the ingestion[3] of exogenous thyroid hormone.[4][5] It can be the result of mistaken ingestion of excess drug, such as levothyroxine[6] and triiodothyronine,[7] or as a symptom of Munchausen syndrome. It is an uncommon form of hyperthyroidism.