Hyperthyroidism is a condition in which the thyroid gland produces excessive hormones. (tickledred.com)
There have been several food scandals in recent months, involving rat meat in mutton, excessive hormones in chicken meat and toxins in rice. (articles.chicagotribune.com)
However, it has been unknown until recently whether these mutations alone are sufficient to prompt thyroid cells to proliferate and produce excessive hormones, or whether additional factors have to be present. (sciencedaily.com)