Related DDx ⬇
Etiology ⬆
- Primary hyperthyroidism, eg, Graves’ disease, toxic multinodular goiter, toxic nodule, subacute thyroiditis, early Hashimoto’s disease
- Thyroid hormone administration
- Severe nonthyroidal illness
- Dopamine or dopamine agonists (levodopa, bromocriptine)
- Pregnancy
- hCG-secreting trophoblastic tumor
- Acute psychiatric illness
- Acute glucocorticoid administration
- Other drugs, eg, NSAIDs, amphetamines, octreotide, opioids, nifedipine, verapamil
- "Subclinical" hyperthyroidism: low TSH, clinically euthyroid, normal T4, common in elderly (10%), risk of atrial fibrillation and osteoporosis