Your thyroid is a small gland in the base of your neck, under your Adam’s apple. The thyroid produces two hormones, T3 and T4. Among many other things, these hormones control how fast you burn calories and how fast your heart beats. A thyroid that is working well will make the right amount of hormones to keep your body working at a rate that is not too fast or too slow.
Hypothyroidism. Hypothyroidism is when your thyroid is sluggish and does not make enough thyroid hormones. A simple blood test can help you and your doctor understand if your symptoms are from a thyroid problem or not.