Which statement about iodine deficiency and hypothyroidism in the United States is true?

Which statement about iodine deficiency and hypothyroidism in the United States is true?

• A. It is a common cause
• B. It is not a common cause
• C. It is the only cause
• D. It never occurs

Answer: (B)

The key idea is that in the United States, iodine deficiency is not a common driver of hypothyroidism. Public health measures, like iodized salt, have ensured adequate iodine intake for most people, so autoimmune thyroid disease (such as Hashimoto thyroiditis) and iatrogenic causes (surgery or radioactive treatment) are the typical culprits rather than a lack of iodine. If iodine deficiency were a major issue here, you’d expect widespread endemic goiter and hypothyroidism, which is not the usual pattern seen today. So the true statement is that iodine deficiency is not a common cause in this country. The other options are not accurate because iodine deficiency does occur in other parts of the world and can cause hypothyroidism, it is not the only cause, and it does occur in some situations, so saying it never occurs would be incorrect.

The key idea is that in the United States, iodine deficiency is not a common driver of hypothyroidism. Public health measures, like iodized salt, have ensured adequate iodine intake for most people, so autoimmune thyroid disease (such as Hashimoto thyroiditis) and iatrogenic causes (surgery or radioactive treatment) are the typical culprits rather than a lack of iodine. If iodine deficiency were a major issue here, you’d expect widespread endemic goiter and hypothyroidism, which is not the usual pattern seen today. So the true statement is that iodine deficiency is not a common cause in this country. The other options are not accurate because iodine deficiency does occur in other parts of the world and can cause hypothyroidism, it is not the only cause, and it does occur in some situations, so saying it never occurs would be incorrect.