Some thyroid glands are nodular because of areas of hyperplasia (overgrowth). No symptoms may arise as a result of this condi-tion, but not uncommonly these nodules slowly increase in size, with some descending into the thorax, where they cause local pressure symptoms. Some nodules become malignant, and some are associated with a hyperthyroid state. Thus, the patient with many thyroid nodules may eventually require surgery.
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