Version July 2025
| Hyperthyroidism due to increased thyroid hormone synthesis |
| Autoimmune thyroid disease |
| Graves' disease |
| Hashitoxicosis* |
| Autonomous thyroid tissue¶ |
| Toxic adenoma |
| Toxic multinodular goiter |
| TSH-mediated hyperthyroidism |
| TSH-producing pituitary adenoma |
| Non-neoplastic TSH-mediated hyperthyroidism |
| Human chorionic gonadotropin-mediated hyperthyroidism |
| Hyperemesis gravidarum |
| Trophoblastic disease (choriocarcinoma, molar pregnancy) |
| Hyperthyroidism due to release of preformed thyroid hormone |
| Thyroiditis |
| Subacute granulomatous (de Quervain's) thyroiditis |
| Painless thyroiditis (silent thyroiditis, lymphocytic thyroiditis) |
| Postpartum thyroiditis |
| Amiodarone (also may cause iodine-induced hyperthyroidism) |
| Checkpoint inhibitor-induced thyroiditis |
| Radiation thyroiditis |
| Palpation thyroiditis |
| Hyperthyroidism due to exogenous thyroid hormone intake |
| Excessive replacement therapy |
| Intentional suppressive therapy |
| Factitious hyperthyroidism |
| Ectopic hyperthyroidism |
| Struma ovarii (ectopic thyroid tissue in an ovarian teratoma) |
| Metastatic follicular thyroid cancer |
TSH: thyroid-stimulating hormone.
* Hashitoxicosis is a variant of Hashimoto's thyroiditis that presents with high thyrotropin receptor antibodies and hyperthyroidism (high radioiodine uptake) with transition to overt hypothyroidism over 3 to 12 months.
¶ Radioiodine uptake may be low if recent iodine load led to iodine-induced hyperthyroidism.