Chronic thyroiditis is swelling (inflammation) of the thyroid gland that often results in reduced thyroid function (hypothyroidism).
Chronic thyroiditis or Hashimoto disease is a common thyroid gland disorder. It can occur at any age, but is most often seen in middle-aged women. It is caused by a reaction of the immune system against the thyroid gland.
The disease begins slowly. It may take months or even years for the condition to be detected. Chronic thyroiditis is most common in women and in people with a family history of thyroid disease.
In rare cases, Hashimoto disease may be related to other hormone problems caused by the immune system. This condition can occur with adrenal insufficiency and type 1 diabetes. In these cases, the condition is called type 2 polyglandular autoimmune syndrome (PGA II).
Less commonly, Hashimoto disease occurs as part of a condition called type 1 polyglandular autoimmune syndrome (PGA I), along with:
Symptoms of Hashimoto disease may include any of the following:
Laboratory tests to determine thyroid function include:
Imaging studies are generally not needed to diagnose Hashimoto thyroiditis.
This disease may also change the results of the following tests:
A lack of thyroid hormone may develop. You may receive thyroid hormone replacement therapy (levothyroxine) if your body is not producing enough of the hormone. Or, you may receive it if you have signs of mild thyroid failure (such as elevated TSH). This condition is also known as subclinical hypothyroidism.
If there is no evidence of thyroid hormone deficiency, you may just need to be seen regularly by a health care provider.
The disease stays stable for years. If it does slowly progress to thyroid hormone deficiency (hypothyroidism), it can be treated with thyroid replacement therapy.
This condition can occur with other autoimmune disorders. In rare cases, thyroid cancer or thyroid lymphoma may develop.
Call your health care provider if you develop symptoms of chronic thyroiditis.
There is no known way to prevent this disorder. Being aware of risk factors may allow earlier diagnosis and treatment.
Reviewed By: Brent Wisse, MD, Associate Professor of Medicine, Division of Metabolism, Endocrinology & Nutrition, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.