Experts don't know the exact cause
thyroid nodules. But they do know that people who have
been exposed to radiation have a greater chance of developing thyroid nodules.
Exposure to environmental radiation or past
radiation treatment to the head, neck, and chest
(especially during childhood) raises your risk for thyroid nodules. Thyroid nodules are more common as you age.
Experts know that thyroid nodules run in families. This means you are
more likely to have a thyroid nodule if one of your parents has had a thyroid
Also, if you have another thyroid condition (such as
goiter ), you may have a greater chance of developing