The term “Thyroiditis” refers to “inflammation of the thyroid gland”. There are many possible causes of thyroiditis. Hashimoto’s thyroiditis is the most common cause of hypothyroidism in the United States. It is an autoimmune disorder involving chronic inflammation of the thyroid. Over time, the ability of the thyroid gland to produce thyroid hormones often becomes impaired and leads to a gradual decline in function and eventually an under-active thyroid (Hypothyroidism). Hashimoto’s thyroiditis occurs most commonly in middle aged women, but can be seen at any age, and can also affect men and children.