Hyperthyroidism can be due to all of the following except A) too much TRH B) too much TSH C) lack of iodine D) too much T₄ or T₃ E) thyroid-stimulating immunoglobulin

Question

Quizplus · Accepted Answer

Hyperthyroidism is caused by an overactive thyroid gland, which is typically stimulated by excessive levels of thyroid-stimulating hormone (TSH) from the pituitary gland. Too much TRH (thyrotropin-releasing hormone) can indirectly lead to hyperthyroidism by increasing TSH levels. Thyroid-stimulating immunoglobulin (TSI) is a type of antibody that can mimic TSH and stimulate the thyroid gland, leading to hyperthyroidism. However, lack of iodine is typically associated with hypothyroidism, not hyperthyroidism. The option D ("too much T₄ or T₃") is not a relevant or coherent answer.

Hyperthyroidism Can Be Due to All of the Following Except