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Hyperthyroidism occurs when the thyroid gland produces too much thyroid hormone.
The disorder affects at least 2.5 million Americans, according to the Thyroid Society , a Houston, Texas-based, nonprofit organization dedicated to the prevention, treatment and cure of thyroid disease. The thyroid gland is a butterfly-shaped gland located in the neck by the Adam's apple. Learn Through Community Connect with others who share your concerns. T4 and T3 affect many bodily functions by regulating how the body uses energy and how fast it works. Nervousness, irritability, hair loss, increased heart rate, and fine tremors may all be signs and symptoms of hyperthyroidism.