Which condition can be caused by iron and iodine deficiency?

Which condition can be caused by iron and iodine deficiency?

• A. Hyperthyroidism
• B. Hypothyroidism
• C. Goiter without hypothyroidism
• D. Hyperparathyroidism

Answer: (B)

Iron and iodine are both essential for making thyroid hormones. Iodine is the raw material for T4 and T3, so not enough iodine directly lowers hormone production. Iron plays a supporting role as a cofactor for thyroid peroxidase, the enzyme that uses iodine to build those hormones; with insufficient iron, this step becomes less efficient, further reducing output. When both deficiencies are present, the thyroid can’t produce enough hormones, leading to hypothyroidism. You may also see the gland enlarge as the pituitary tries to stimulate it with more TSH, which is a common response to low hormone levels. Hyperthyroidism is the opposite condition and isn’t caused by these deficiencies, and while iodine deficiency can cause a goiter, the systemic consequence most tied to these deficiencies is hypothyroidism.

Iron and iodine are both essential for making thyroid hormones. Iodine is the raw material for T4 and T3, so not enough iodine directly lowers hormone production. Iron plays a supporting role as a cofactor for thyroid peroxidase, the enzyme that uses iodine to build those hormones; with insufficient iron, this step becomes less efficient, further reducing output. When both deficiencies are present, the thyroid can’t produce enough hormones, leading to hypothyroidism. You may also see the gland enlarge as the pituitary tries to stimulate it with more TSH, which is a common response to low hormone levels. Hyperthyroidism is the opposite condition and isn’t caused by these deficiencies, and while iodine deficiency can cause a goiter, the systemic consequence most tied to these deficiencies is hypothyroidism.