Courtesy of: EarthTalk®

Dear EarthTalk: Instances of people with thyroid problems seems to be on the rise. Is there an environmental connection? — Dora Light, Waukesha, WI

The American Cancer Society reports that thyroid cancer is one of the few cancers that have been on the rise in recent decades, with cases increasing six percent annually since 1997. Many researchers, however, attribute these increases to our having simply gotten better at detection. Regardless, exposures to stress, radiation and pollutants have been known to increase a person’s risk of developing thyroid problems.

Thyroid disease takes two primary forms. Hyperthyroidism occurs when the thyroid produces too much of the T3 and T4 hormones that regulate metabolism. This can cause a racing heart, weight loss, insomnia and other problems. In cases of hypothyroidism, the body produces too few hormones, so we feel fatigued and may gain weight, among other symptoms. According to the American Thyroid Association (ATA), many people with thyroid problems don’t realize it, as symptoms can be mistaken for other problems or attributed to lack of sleep. Thyroid problems in children can delay or impair neurological development.

This article appears in Mar 10-16, 2011.