What Causes Thyroid Nodules?

One of the major things I can think of that causes thyroid nodules is the lack of iodine in a person's diet. That's why when you buy salt for your cooking needs you should buy salt that has iodine in it. You can find more information here: http://www.mayoclinic.com/health/thyroid-nodules/DS00491/DSECTION=causes
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