IN THIS ARTICLE
In the United States, the most common cause of hypothyroidism is Hashimoto's thyroiditis. This is a condition that causes the body's natural defenses—the immune system—to produce antibodies that over time destroy thyroid tissue. As a result, the thyroid gland cannot make enough thyroid hormone.
Worldwide, iodine deficiency is the number one cause of hypothyroidism. But iodine added to salt, food, and water has nearly eliminated this problem in the U.S. and other Western countries.
Other common causes of hypothyroidism include:
Less common causes include:
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