Chronic thyroiditis is caused by a reaction of the immune system against the thyroid gland. It often results in reduced thyroid function (hypothyroidism).
The disorder is also called Hashimoto disease.
The thyroid gland is located in the neck, just above where your collarbones meet in the middle.
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 and for thyroid hormone levels to become lower than normal. Hashimoto disease is most common in people with a family history of thyroid disease.
In very rare cases, the disease may be related to other hormone problems caused by the immune system. It can occur with poor adrenal function and type 1 diabetes. In these cases, the condition is called type 2 polyglandular autoimmune syndrome (PGA II).
Sometimes, 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 and fine needle biopsy are generally not needed to diagnose Hashimoto thyroiditis.
This disease may also change the results of the following tests:
If you have findings of an underactive thyroid, you may receive thyroid replacement medicine.
Not everyone with thyroiditis or goiter has low levels of thyroid hormone. You may just need regular follow-up 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 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.