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Cardiac complications include rapid heart rate, congestive heart failure, and atrial fibrillation (a rapid and irregular heart rhythm). Another complication of hyperthyroidism is bone loss leading to osteoporosis.
Thyroid crisis or storm is an acute worsening of the symptoms of hyperthyroidism, which may occur with infection or stress. Fever, decreased mental alertness, and abdominal pain may occur, and immediate hospitalization is necessary.
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