TSH decreased

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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

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Last updated: December 1, 2014