Thyroid hormones are essential chemicals produced by the thyroid gland, located in the front of the neck. These hormones, mainly thyroxine (T4) and triiodothyronine (T3), play a crucial role in regulating the body's metabolism, which is how our body uses energy. They help control various functions, including heart rate, body temperature, and even how quickly we burn calories. When the levels of thyroid hormones are balanced, our bodies function smoothly. However, if there is too much or too little of these hormones, it can lead to health issues. For example, an overactive thyroid can cause hyperthyroidism, while an underactive thyroid can lead to hypothyroidism, both of which require medical attention.