The Role of the Thyroid in the Human Body

The thyroid is a gland, and an integral part of the body.

The thyroid is a small, butterfly-shaped gland located in the base of our neck, just below the Adam's apple. The two main hormones produced by it are iodine (containing hormones thyroxine or T4) and Triiodothyronine (or T3) that circulate in the body through the bloodstream and work on every living tissue and cell. TSH, a thyroid-stimulating hormone, is produced by the pituitary that stimulates the thyroid gland. These hormones are essential for life and have many effects on body metabolism, growth and development. For example, thyroid hormones make the heart beat faster and cause the body to burn up calories more quickly.

Common thyroid conditions

There are certain problems associated with thyroid, the most common among the general population being Hypothyroidism and Hyperthyroidism. Hypothyroidism is a condition where the thyroid gland doesn't produce a sufficient amount of hormones (underactive thyroid), while it produces more (overactive thyroid) in the case of Hyperthyroidism.


The most common cause of this is Hashimoto's thyroiditis, an autoimmune condition that destroys the thyroid gland. Hashimoto's thyroiditis is an auto-immune disease where the body's own anti-bodies attack the thyroid cells. Auto-immunity occurs when an organism or body fails to recognize its own constituent parts, thereby turning against its own cells and tissues. It is a state where immune cells in your body mistake your own organs, cells or glands as intruders and attack them. Auto-immunity can work against any organ. It could be auto-immunity of the stomach or joints, and when it acts on the thyroid gland, we call it auto-immune thyroiditis.

Hypothyroidism is found more often in women than men and can be missed in its early stages because of its very insidious onset with symptoms, which can simulate many other diseases. In the beginning of development of clinical hypothyroidism, even before the TSH level is high enough to warrant treatment, the body's metabolism can slow down. This means fewer calories burned each day, and even those few calories start to add up.

Hypothyroidism brings in lethargy, which makes regular exercise even more troublesome and the vicious cycle sets in. It occurs when the body's metabolism is too slow due to an absence or deficiency of the thyroid hormone. The good news is, it can be easily treated, as it requires a replacement of hormones through medication and the regular monitoring of blood levels of the hormones.


This occurs when an excess in thyroid hormone produces symptoms of abnormally high metabolism, either due to an overactive thyroid gland or taking too much thyroid hormone replacements like medicines. The most common cause of hyperthyroidism is Graves' disease -- an auto-immune disease where the body's own immune system mistakenly attacks its own thyroid gland, causing it to overproduce the thyroxine hormone.

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The Canary Club is an educational advisory group with a team of medical advisors headed by Richard Shames, M.D.