In the United States, the most common cause of goiter is Hashimoto’s thyroiditis, says Dr. Barlow. This is an autoimmune disorder that causes hypothyroidism, or an underactive thyroid. The body’s ...
Your thyroid gland is a butterfly-shaped organ on the front of your neck. Its main function is to produce a thyroid hormone that regulates your metabolism. Hypothyroidism occurs when a person’s ...