Question

Hyperthyroidism is excessive secretion of thyroid hormones. This can happen due to

• A. Excess secretion of thyroid hormone in thyroid gland
• B. Excess secretion of TSH from pituitary gland
• C. Excess secretion of TSH-RH from hypothalamus
• D. All the above

Answer 1

The correct option is D

All the above

Thyroid hormone is secreted by thyroid gland under the influence of Thyroid Secreting Hormone (TSH). TSH is produced by the pituitary, which in turn, is secreted under the influence of TSH-releasing hormone (TSH-RH) from the hypothalamus. Therefore, excess secretion of any of these can cause hyperthyroidism.