Causes of Thyrotoxicosis Hyperthyroidism

Thyrotoxicosis is any syndrome caused by excess thyroid hormone. Hyperthyroidism is related to excess thyroid hormone secreted by the thyroid gland. Thyrotoxicosis can be related to the presence or absence of excess hormone production (hyperthyroid-ism). The common causes of thyrotoxicosis are shown in Table 44-6 '

disease is the most common cause of hyperthyroidism. Thyrotoxicosis in the elderly is more likely due to toxic thyroid nodules or multinodular goiter than to Graves' disease. Excessive intake of thyroid hormone may be due to overtreatment with prescribed therapy. Surreptitious use of thyroid hormones also may occur, especially in health professionals or as a self-remedy for obesity. Thyroid hormones can be obtained easily without a prescription from health food stores or Internet sources. Refer to Clinical Presentation and Diagnosis of Hyperthyroidism for information regarding screening and diagnosis.

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