Hyperthyroidism Criteria

Thyrotoxicosis means that tissues are exposed to excessive thyroid hormone action, regardless of where the hormone came from. Hyperthyroidism is narrower: the thyroid gland is actively producing too much hormone. Graves disease, toxic multinodular goiter, and toxic adenoma cause true hyperthyroidism. Thyroiditis releases preformed hormone from injured follicles, while prescribed or nonprescribed thyroid hormone causes thyrotoxicosis without increased gland production. That distinction matters because antithyroid drugs block new synthesis; they do not remove hormone that has already leaked from a damaged gland or been taken from outside the body. The clinical picture reflects an accelerated metabolic state and increased adrenergic sensitivity. Patients may report heat intolerance, sweating, weight loss despite appetite, frequent stools, tremor, anxiety, insomnia, and proximal muscle weakness. An experienced nurse notices the pulse and rhythm early: persistent tachycardia, widened pulse pressure, or a new irregular rhythm may signal atrial fibrillation rather than simple nervousness. Assess temperature, hydration, orthostatic symptoms, cardiac rhythm, heart-failure findings, mental status, and gastrointestinal symptoms. A goiter, thyroid bruit, thyroid tenderness, lid retraction, proptosis, or diplopia helps narrow the cause. Untreated hormone excess increases...