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.
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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 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).
Rarely (usually in children), Hashimoto disease occurs as part of a condition called type 1 polyglandular autoimmune syndrome (PGA I), along with:
Poor function of the adrenal glands
Fungal infections of the mouth and nails
Underactive parathyroid gland
Symptoms of Hashimoto disease may include any of the following:
Difficulty concentrating or thinking
Enlarged neck or presence of goiter, which may be the only early symptom
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:
Complete blood count
Untreated hypothyroidism can change how your body uses medicines that you may take for other conditions, such as epilepsy. You'll likely need to have regular blood tests to check the levels of the medicines in your body.
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 hormone replacement therapy.
This condition can occur with other autoimmune disorders. In rare cases, thyroid cancer or thyroid lymphoma may develop.
Severe untreated hypothyroidism can lead to a change in consciousness, coma, and death. This usually occurs if people get an infection, are injured, or take medicines, such as opioids.
When to Contact a Medical Professional
Call your provider if you develop symptoms of chronic thyroiditis or hypothyroidism.
There is no known way to prevent this disorder. Being aware of risk factors may allow earlier diagnosis and treatment.
Amino N, Lazarus JH, De Groot LJ. Chronic (Hashimoto's) thyroiditis. In: Jameson JL, De Groot LJ, de Kretser DM, et al, eds. Endocrinology: Adult and Pediatric. 7th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 86.
Brent GA, Weetman AP. Hypothyroidism and thyroiditis. In: Melmed S, Auchus RJ, Golfine AB, Koenig RJ, Rosen CJ, eds. Williams Textbook of Endocrinology. 14th ed. Philadelphia, PA: Elsevier; 2020:chap 13.
Jonklaas J, Bianco AC, Bauer AJ, et al. Guidelines for the treatment of hypothyroidism: prepared by the American Thyroid Association task force on thyroid hormone replacement. Thyroid. 2014;24(12):1670-1751. PMID: 25266247 pubmed.ncbi.nlm.nih.gov/25266247/.
Lakis ME, Wiseman D, Kebebew E. Management of thyroiditis. In: Cameron AM, Cameron JL, eds. Current Surgical Therapy. 13th ed. Philadelphia, PA: Elsevier; 2020:764-767.
Brent Wisse, MD, board certified in Metabolism/Endocrinology, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.