Not having enough iodine in the diet is a rare cause of hypothyroidism in the U.S. Other causes of primary hypothyroidism include: 1  Certain drugs such as lithium. 2  Radiation exposure to the neck. 3  Radioactive iodine used for treatment of hyperthyroidism (overactive thyroid). 4  Special x-ray dyes.
Princeton, TX. Princeton is located in northeast Texas. Princeton is part of Collin County. Princeton has 7.40 square miles of land area and 0.06 square miles of water area. As of 2010-2014, the total Princeton population is 7,520, which has grown 116.28% since 2000.
Grayson County, Texas. Grayson County is a county in the U.S. state of Texas. As of the 2010 census, its population was 120,877. The county seat is Sherman. The county was founded in 1846 and is named after Peter Wagener Grayson, an attorney general of the Republic of Texas.