Which of the Following is NOT a Cause of Hypothyroidism

Question

Which of the following is NOT a cause of hypothyroidism
A)lack of TRH
B)iodine-deficient diet
C)Grave's disease
D)lack of an enzyme necessary for one of the steps in the synthesis and release of thyroid hormone

Accepted Answer

Grave's disease is a cause of hyperthyroidism, not hypothyroidism. A lack of TRH, an iodine-deficient diet, and a lack of an enzyme necessary for thyroid hormone synthesis and release are all known causes of hypothyroidism.