Graves disease (hyperthyroidism) and Hashimotos thyroiditis, are diseases of this type. Graves disease affects about 1 in 100 of the population, whereas Hashimotos thyroiditis is even more common (its prevalence increases with age).
They may also have a slightly enlarged thyroid gland. Treatment is medication in the form of tablets which reduce the activity of the thyroid gland and return all thyroid hormone levels to normal.
Once thyroid hormone levels are restored, TSH secretion stabilizes at a high level. In healthy individuals and in those with goitre, the hypothalamic - pituitary - thyroid axis maintains thyroid hormone production at a finely controlled level and enables the thyroid to respond to situations requiring more or less thyroid hormone production.
Health Guides on Thyroid Disease The thyroid gland is located in the front of the neck attached to the lower part of the voicebox (or larynx) and to the upper part of the windpipe (or trachea).
Hypothalamic - Pituitary - Thyroid Axis. The thyroid gland is influenced by hormones produced by two other organs: The pituitary gland, located at the base of the brain, produces thyroid stimulating hormone (TSH) The hypothalamus, a small part of the brain above the pituitary, produces thyrotropin releasing hormone (TRH).
In areas of the world where there is an iodine deficiency, iodine must be added to the salt or bread. The Great Lakes area of Canada and the U.S., the Swiss Alps and Tasmania are such areas.
What is thyroid stimulating hormone? Thyroid stimulating hormone is produced and released into the bloodstream by the pituitary gland. It controls production of the thyroid hormones, thyroxine and triiodothyronine, by the thyroid gland by binding to receptors located on cells in the thyroid gland. Thyroxine
Low levels of thyroid hormones in the blood are detected by the hypothalamus and the pituitary. TRH is released, stimulating the pituitary to release TSH. Increased levels of TSH, in turn, stimulate the thyroid to produce more thyroid hormone, thereby returning the level of thyroid hormone in the blood back to normal.
In the later stages, the goitre can disappear because of the progressive destruction of the thyroid. Thyroid Nodules. Sometimes, thyroid enlargement is restricted to one part of the gland; the rest of the gland being normal.
In Canada and the U.S., most of the salt is iodized, thus the iodine intake is more than adequate. Taking excess amounts of iodine in foods such as kelp can aggravate hyperthyroid disease.
Iodine. Iodine plays an important role in the function of the thyroid gland. It is the chief component of thyroid hormones, and is essential for their production. Iodine is obtained from the water we drink and the food we eat.
Symptoms of thyrotoxicosis include intolerance to heat, weight loss, increased appetite, increased bowel movements, irregular menstrual cycle, rapid or irregular heartbeat, palpitations, tiredness, irritability, tremor, hair loss and retraction of the eyelids resulting in a staring appearance.
Thyroid Disorders The main causes of thyroid disease are: too much thyroid hormone production or hyperthyroidism. too little thyroid hormone production or hypothyroidism. The state of normal thyroid function is called euthyroidism.
The three glands and the hormones they produce make up the "Hypothalamic - Pituitary - Thyroid axis.". The way a goitre forms in those geographic areas of the world which have a deficiency of iodine is a good example of how the axis functions.
Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland. It plays vital roles in digestion, heart and muscle function, brain development and maintenance of bones. Alternative names for thyroxine T4; tetraiodothyronine; thyroxin.
Hypothalamus secretes thyrotropin-releasing hormone which, in turn, stimulates the pituitary gland to produce thyroid stimulating hormone. This hormone stimulates the production of the thyroid hormones, thyroxine and triiodothyronine, by the thyroid gland.
"Autoimmune disorders" of the thyroid gland are the most common cause of thyroid dysfunction. These autoimmune disorders are caused by abnormal proteins, (called antibodies and the white blood cells which act together to stimulate or damage the thyroid gland.
System allows the body to maintain a constant level of thyroid hormones in the body. What happens if I have too much thyroxine? The release of too much thyroxine in the bloodstream is known as thyrotoxicosis. This
Reviewed: January 2015).