What does the thyroid do?

What does the thyroid do?
Your thyroid has an important job to do within your body — releasing and controlling thyroid hormones that control metabolism. Metabolism is a process where the food you take into your body is transformed into energy. This energy is used throughout your entire body to keep many of your body’s systems working correctly.

The thyroid controls your metabolism with a few specific hormones — T4 (thyroxine, contains four iodide atoms) and T3 (triiodothyronine, contains three iodide atoms). These two hormones are created by the thyroid and they tell the body’s cells how much energy to use.

When the pituitary gland senses a lack of thyroid hormones or a high level of hormones in your body, it will adjust the amounts with its own hormone. This hormone is called thyroid stimulating hormone (TSH). The TSH will be sent to the thyroid and it will tell the thyroid what needs to be done to get the body back to normal.