Add Yahoo as a preferred source to see more of our stories on Google. In the United States, the most common cause of goiter is Hashimoto’s thyroiditis, says Dr. Barlow. This is an autoimmune disorder ...

Goiter is an abnormal enlargement of the thyroid gland, the butterfly-shaped gland at the base of the neck. While iodine deficiency is a major global cause, both too little and too much iodine can ...

The thyroid is a butterfly-shaped gland that sits in the front of the neck. It produces hormones that are essential for heart rate, digestion, mood, and other functions crucial to human health.