Thyroid nodules cannot be prevented.

It is not clear whether people who do not have any risk factors and who do not have any symptoms of hyperthyroidism need to be tested regularly for thyroid problems. The American Thyroid Association recommends that adults, particularly women, be screened for thyroid problems every 5 years, beginning at age 35. But the U.S. Preventive Services Task Force does not think there is enough evidence to recommend either for or against regular thyroid testing. Talk to your doctor about whether you need to be tested for thyroid problems.