What does low t4 mean?

Low T4, or low thyroxine levels, indicate a deficiency in the thyroid hormone produced by the thyroid gland. This condition can lead to symptoms such as fatigue, weight gain, depression, and sensitivity to cold, as T4 plays a crucial role in regulating metabolism and energy levels. Low T4 levels may suggest hypothyroidism, which can result from various factors, including autoimmune diseases, iodine deficiency, or certain medications. Diagnosis and treatment typically involve thyroid function tests and hormone replacement therapy if necessary.