What is the condition called when the thyroid is overactive?

The condition when the thyroid is overactive is known as thyrotoxicosis. This term specifically refers to the excess levels of thyroid hormones in the body, which can result from various causes, including Graves' disease, toxic nodular goiter, or excessive intake of thyroid hormone medication. The symptoms of thyrotoxicosis can include weight loss, increased heart rate, anxiety, and sensitivity to heat, among others.

In contrast, hypothyroidism refers to an underactive thyroid, where hormone production is insufficient. Hypoparathyroidism relates to a deficiency of parathyroid hormone, affecting calcium levels in the body. Adrenal insufficiency refers to insufficient production of hormones by the adrenal glands. Understanding these differences helps highlight thyrotoxicosis as the correct term for an overactive thyroid.