Thyroid goiter

Sometimes the thyroid gland will simply grow too large.  This can occur as a result of many nodules gradually enlarging or as a result of the substance of the gland simply expanding over time.  There is almost no limit to how large a gland can get.

Thyroid goiter formation can occur as a result of iodine deficiency, as had occurred before iodized salt was introduced. In most cases in the U.S., however, the cause is unknown.