Skip to content

Hashimoto’s Disease (Autoimmune Thyroiditis Causing Hypothyroidism)

DyspareuniaWhat Is Autoimmune Thyroiditis (Hypothyroidism)?

[dropcap]A[/dropcap]utoimmune thyroiditis, also called Hashimoto’s thyroiditis or Hashimoto’s Disease, is an autoimmune destruction of thyroid tissue characterized by insufficient thyroid hormone circulating in the body that causes formation of a goiter (enlarged thyroid gland) and hypothyroidism.

Hypothroidism refers to the condition of markedly reduced secretion of thyroid hormone. There are other causes of hypothyroidism besides Hashimoto’s thyroiditis.

Hashimoto’s thyroiditis is often associated with other autoimmune diseases such as celiac disease.

In Hashimoto’s thyroiditis, a profusion of antibodies are produced, which build up in the blood. Left untreated so that much of the thyroid gland is destroyed, this condition may progress to the very serious and life-threatening condition called myxedema.

Note: In myxedema, protein, electrolytes, and water abnormally accumulate in between cells which produce firm, inelastic puffy skin that is cool, dry, rough, scaly, and may appear yellow; in some people, areas such as the ankles become crusty with a look of tree bark. Many systemic changes develop shown by significant slowing of mental and physical functions. Please see below.

Q: What thyroid tissue is targeted for destruction?

A: In Hashimoto’s thyroiditis, high levels of autoantibodies target thyroglobulin and thyroid peroxidase, leading to inflammation and destruction of the thyroid gland. The resulting fibrosis or scarring of the gland results in lack of thyroid hormone production.

The thyroid gland consists of a large number of closed vesicles that contain a homogenous substance called colloid, which contains the thyroglobulin. Thyroglobulin is an iodine-containing protein secreted by the thyroid gland and stored within its colloid, from which the thyroid hormones thyroxine (T4) and triiodothyroinine (T3) are derived.1

T3 is the active hormone and is made from T4. Thyroid hormones affect metabolism, brain development, breathing, heart and nervous system functions, body temperature, muscle strength, skin dryness, menstrual cycles, weight, and cholesterol levels.

Thyroid hormone production is regulated by thyroid-stimulating hormone (TSH), which is made by the pituitary gland in the brain. Normally, when thyroid hormone levels in the blood are low, the pituitary releases more TSH. When thyroid hormone levels are high, the pituitary decreases TSH production.

Hashimoto’s disease, with or without the development of hypothyroidism, is treated with synthetic thyroxine, which is man-made T4. Health care providers prefer to use synthetic T4, such as Synthroid® (Levothyroxine), rather than synthetic T3, because T4 stays in the body longer, ensuring a steady supply of thyroid hormone throughout the day. The thyroid preparations made with animal thyroid are not considered as consistent as synthetic thyroid.2

What Is Autoimmune Thyroiditis In Celiac Disease and/or Gluten Sensitivity?

Sources:
  1. Taber’s Cyclopedic Medical Dictionary. 19th ed. F.A. Davis Company. Philadelphia, PA. [↩]
  2. National Endocrine and Metabolic Diseases Information Service. [↩]

Juvenile Autoimmune Thyroid Disease

Goiter in Grave's disease. Courtesy Wikimedia.
Goiter in Grave’s disease. Courtesy Wikimedia.

What Is Juvenile Autoimmune Thyroid Disease?

Juvenile autoimmune thyroid disease is an autoimmune disorder occurring in childhood that targets and damages the thyroid gland, often causing goiter. It is characterized by abnormal circulating thyroid hormone levels in the bloodstream.

Recent evidence suggests that thyroid autoimmunity originates from an interaction of genetic, endogenous and environmental factors which end up activating thyroid-specific autoreactive T-lymphocyte cells in susceptible children.1

Q: What is the thyroid gland?

Thyroxine molecule, chemical structure. Thyroid gland hormone that plays a role in energy metabolism regulation. It is a iodine containing derivative of thyrosine. Atoms are represented as spheres with conventional color coding: hydrogen (white), carbon (grey), oxygen (red), nitrogen (blue), iodine (purple).
Thyroxine molecule. Atoms are represented as spheres with conventional color coding: hydrogen (white), carbon (grey), oxygen (red), nitrogen (blue), iodine (purple).

A: The thyroid is an endocrine (hormone secreting) gland that produces thyroid hormones in response to the action of thyroid stimulating hormone (TSH) produced by the pituitary gland, and releases them into the bloodstream to be quickly carried to their site of action.

The three thyroid hormones are thyroxine, called T4, triiodothyronine, called T3, and calcitonin. T4 and T3 hormones control the rate of metabolism, meaning 1) the rate of food usage for energy production, 2) the rate of protein production and breakdown in most tissues, 3) the heart rate and force of heart muscle contraction, 4) body temperature, and 5) the rate of growth and development in children.

Dietary iodine and selenium are required for T3 production. Specifically, selenium is part of the enzyme that converts T4 to the active form, T3. Calcitonin hormone is needed to build and maintain dense bones and regulate calcium blood level. The thyroid gland is located in the front of the neck at the top of the trachea (windpipe).

Who Is Affected in the General Population? Autoimmune thyroid disease is the most common etiology of acquired thyroid dysfunction in pediatrics. It is more common in females and usually occurs in early to mid-puberty. Presentation is rare under the age of 3 years, but cases have been described even in infancy.2 

What Is Juvenile Autoimmune Thyroid Disease In Celiac Disease and/or Gluten Sensitivity?

Sources:
  1. Gopalakrishnan S, Marwaha RK. Juvenile autoimmune thyroiditis. J Pediatr Endocrinol Metab. 2007 Sep;20(9):961-70. [↩]
  2. Cappa M, Bizzarri C, and Crea F. Autoimmune Thyroid Diseases in Children. Journal of Thyroid Research. Volume 2011 (2011), Article ID 675703, 13 pages. http://dx.doi.org/10.4061/2011/675703 [↩]