What condition is characterized by an excess of thyroid hormone?

Hyperthyroidism is defined as a condition where there is an overproduction of thyroid hormones, leading to an accelerated metabolism. This condition can result in symptoms such as increased heart rate, weight loss, heat intolerance, and nervousness.

The thyroid gland plays a crucial role in regulating various bodily functions through the hormones it produces. When the production of these hormones exceeds normal levels, it disrupts the body’s balance and can lead to the variety of symptoms associated with hyperthyroidism.

In contrast, hypothyroidism, thyroiditis, and Hashimoto's Disease involve different aspects related to thyroid hormone levels. Hypothyroidism is characterized by insufficient production of thyroid hormones, while thyroiditis refers to inflammation of the thyroid gland, which may lead to hormone imbalances without necessarily indicating excess production. Hashimoto's Disease is an autoimmune disorder that usually results in hypothyroidism due to the body's immune system attacking the thyroid.

Thus, when considering the characteristics and effects of excessive thyroid hormone production, hyperthyroidism distinctly stands out as the correct answer for the condition associated with an excess of thyroid hormones.