Which condition is indicated by very high levels of thyroid hormones in the blood?

Very high levels of thyroid hormones in the blood clearly indicate hyperthyroidism. This condition arises when the thyroid gland produces an excessive amount of thyroid hormones, leading to a hypermetabolic state. Symptoms of hyperthyroidism can include increased heart rate, weight loss, anxiety, heat intolerance, and increased sweating, among others. The overproduction of hormones, primarily thyroxine (T4) and triiodothyronine (T3), results from conditions such as Graves' disease, toxic nodular goiter, or thyroiditis, further substantiating the diagnosis.

Hypothyroidism, on the other hand, is characterized by low thyroid hormone levels, which is the opposite of what is being asked. Diabetes Mellitus is unrelated to thyroid hormone levels, as it primarily involves insulin regulation and blood glucose levels. Thyroiditis refers to inflammation of the thyroid, which can sometimes lead to fluctuating hormone levels but does not inherently signify very high hormone levels. Thus, hyperthyroidism is the condition associated with very high levels of thyroid hormones in the blood.