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www.reference.com/article/thyroid-levels-tested-1f9f0794398ba34

People concerned about their thyroid functioning can visit their primary care doctors to discuss their concerns and have their thyroid levels checked through blood tests, explains WebMD. Tests are available to test thyroid-stimulating hormone, or TSH, as well as the hormones the thyroid directly sec

www.reference.com/world-view/high-thyroid-levels-mean-cf6faecd24daf95c

High levels of thyroid indicate hyperthyroidism, a condition whereby the thyroid gland produces too much thyroid hormone, according to WebMD. The most common cause of this is Grave's disease, which tends to be hereditary.

www.reference.com/article/can-cause-high-thyroid-levels-7c35df00e242b33e

High thyroid levels, or hyperthyroidism, is most commonly caused by Graves’ disease, but can also be caused by multinodular or toxic nodular goiters, excess consumption of iodine or medications that contain iodine, according to EndocrineWeb. More rarely, pregnant women or women who recently gave bir

www.reference.com/article/treatment-high-thyroid-levels-bfaacbdef093d846

Treatment for high thyroid levels may depend on age, severity and cause, with available options including surgery, anti-thyroid medication, radioactive iodine and beta-blockers. The condition in which the thyroid glands produce too many hormones than the body really needs is commonly referred to as

www.reference.com/world-view/symptoms-high-thyroid-levels-dd2d333e142a5189

Symptoms of overactive thyroid, or hyperthyroidism, include double vision, bulging eyes, hair loss, heart arrhythmia, goiter, muscle weakness and rapid heartbeat, states WebMD. These symptoms are often unclear and can also resemble those of other conditions or illnesses.

www.reference.com/article/high-thyroid-fb6a376ff31b3e6f

An overactive thyroid produces more thyroid hormones than the body needs, and the medical term for the condition is hyperthyroidism, according to WebMD. Women have a higher risk of developing the condition than men.

www.reference.com/article/mean-high-thyroid-levels-1c38ddea629f8620

There are several possible causes for high thyroid levels, including Graves' disease, toxic adenoma, Plummer's disease and thyroiditis, according to Mayo Clinic. The general term used when a patient has an overactive thyroid is hyperthyroidism. Women are five to 10 times more likely to get hyperthyr

www.reference.com/article/low-thyroid-levels-992ea4e7f6b9cc39

Normal thyroid levels range from 0.4 to 4 milli-international units per liter, and anything below this range is considered low, according to MedlinePlus. Low thyroid levels are often caused by an overactive thyroid or certain types of medication, including chemotherapy and opiate-based painkillers.

www.reference.com/article/side-effects-high-thyroid-levels-e8bd4211752bbeac

The most common side effect of high thyroid levels, or hyperthyroidism, is a protruding lump in the throat, which is also known as a goiter, according to WebMD. The heartbeat is sometimes irregular or very fast. Hair falls out, thins or becomes brittle.

www.reference.com/article/causes-low-thyroid-levels-7d3a658f26fa7295

The most common cause of low thyroid levels is a condition known as Hashimoto's thyroiditis, which leads to the inflammation of the thyroid gland, according to WebMD. This is an autoimmune disorder in which the body produces antibodies that attack the thyroid. Viral infections can also cause low thy