Hyperthyroidism Can Be Due to All of the Following EXCEPT

Question

Hyperthyroidism can be due to all of the following EXCEPT which one
A)too much TRH
B)lack of iodine
C)too much TSH
D)too much T₄ or T₃

Accepted Answer

Hyperthyroidism is caused by excessive production of thyroid hormones T₄ and T₃. This can be due to excessive TRH, TSH or T₄/T₃ production. However, lack of iodine leads to hypothyroidism, not hyperthyroidism.