The thyroid gland is a small gland located in the neck that plays an important role in regulating many body functions, including metabolism, growth, and development. When the thyroid gland does not function properly, it can lead to a variety of symptoms and health problems.

The most common thyroid disorders are hyperthyroidism and hypothyroidism. Hyperthyroidism is a condition in which the thyroid gland produces too much thyroid hormone, while hypothyroidism is a condition in which the thyroid gland does not produce enough thyroid hormone.