What condition is linked to low levels of thyroid hormone?

Hypothyroidism is a condition directly associated with low levels of thyroid hormone in the body. When the thyroid gland does not produce sufficient amounts of hormones, various bodily functions can slow down, leading to symptoms such as fatigue, weight gain, cold intolerance, and depression. This condition can occur for several reasons, including autoimmune diseases like Hashimoto’s disease, iodine deficiency, certain medications, or damage to the thyroid gland.

Understanding the physiological role of thyroid hormones helps clarify why low levels result in hypothyroidism. These hormones are crucial for regulating metabolism, energy production, and overall growth and development. When they are deficient, the body's metabolism decreases, leading to the characteristic symptoms of hypothyroidism.

Other conditions like hyperthyroidism and thyroiditis relate to either excessive hormone production or inflammation of the thyroid, respectively, rather than low hormone levels. Adrenal fatigue is not a medically recognized condition related to thyroid function, further distinguishing hypothyroidism as the correct choice in this context.