<unk>  (alimentary<unk> , exogenous<unk>  refers to a condition of<unk>  caused by the ingestion of exogenous thyroid hormone. It can be the result of mistaken ingestion of excess drug, such as levothyroxine and triiodothyronine, or as a symptom of Munchausen syndrome. It is an uncommon form of hyperthyroidism. 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. Ingestion of thyroid hormone also suppresses thyroglobulin levels helping to differentiate<unk>  from other causes of hyperthyroidism, in which serum thyroglobulin is elevated. Caution, however, should be exercised in interpreting thyroglobulin results without thyroglobulin antibodies, since thyroglobulin antibodies commonly interfere in thyroglobulin immunoassays causing false positive and negative results which may lead to clinical misdirection. In such cases, increased faecal thyroxine levels in<unk>  may help differentiate it from other causes of hyperthyroidism.
Thyrotoxicosis factitia
Pork–cat syndrome
Thyroid storm
Polar T3 syndrome
Hyperpituitarism
Oneiroid syndrome
Adiposis dolorosa
Acromegaly