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Hyperthyroidism describes excessive production of thyroid hormone, a less common condition than hypothyroidism. Symptoms of hypothyroidism usually
relate to increased metabolism. In mild cases, there may not be apparent
symptoms. Symptoms and signs of hyperthyroidism can include:
Fast heart rate
Intolerance for heat
Increase in bowel movements
Some of the most common causes of hyperthyroidism are:
Toxic multinodular goiter
Thyroid nodules that overexpress
thyroid hormone (known as "hot" nodules)