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Deccan Chronicle
26 May 2010

Underactive (hypothyroidism) or overactive thyroid (hyperthyroidism) can occur any time. Women are 5–8 times more likely to be affected than men. Untreated, both can lead to complications.

cancer: There are no clear–cut causes for thyroid cancer, but exposure to radiation, a diet of seafood and shellfish, and living in areas with iodine–rich soil are believed to increase risk .

tobacco: Smoking is said to decrease secretion of thyroid hormone and even block its action, aggravating hypothyroidism, especially in women.

pregnancy: Thyroid gland produces 10 to 15 per cent more thyroxine during pregnancy, raising risk of hyperthyroidism.

Signs and Symptoms of Thyroid Disease