The major organ that produces thyroid hormones is the thyroid gland. Located in the neck, this butterfly-shaped gland plays a crucial role in regulating metabolism, growth, and energy levels in the body. The thyroid produces two main hormones: thyroxine (T4) and triiodothyronine (T3). These hormones influence many bodily functions, including heart rate, weight regulation, and temperature control. Thyroid health is vital, as imbalances can lead to conditions such as hypothyroidism (underactive thyroid) or hyperthyroidism (overactive thyroid), both of which can affect overall well-being.