The thyroid gland is located on the front part of the neck.
The gland produces hormones which regulate body metabolism and ultimately effect every organ in the body. Diseases of the thyroid gland can result in hyper or hypothyroidism.
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What is hypothyroidism.

The function of the thyroid gland is to produce hormones that regulate the body's metabolism. Hypothyroidism occurs when the thyroid gland does not produce enough thyroid hormone, and therefore, it affects the way the body uses energy, and negatively impacts other systems in the body.