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The thyroid is an endocrine gland located in the neck, just below the voicebox. Endocrine glands produce hormones. These are chemicals that carry messages through the bloodstream to other parts of the body. The thyroid gland produces thyroid hormone. It does this with help from a gland in the brain called the pituitary.
Thyroid hormone helps keep all the cells in the body working right. It does this by controlling the metabolism. This is the rate at which every part of the body functions. Thyroid hormone keeps the metabolism at a healthy pace. This helps the brain, heart, muscles, and other organs work well. A balanced metabolism also helps ensure a healthy temperature, heart rate, energy level, and growth rate.
The thyroid hormone must be kept at a healthy level. A complex cycle maintains this level. The cycle starts with the pituitary. This gland monitors the level of thyroid hormone in the blood. Depending on the level, the pituitary sends TSH (thyroid stimulating hormone) through the bloodstream to the thyroid gland. TSH tells the thyroid how much thyroid hormone to make. In response to TSH, the thyroid makes thyroid hormone. Then thyroid hormone is sent into the bloodstream to the rest of the body. The pituitary senses the hormone level, adjusts the TSH level, and the cycle continues.