Pheochromocytoma disturbs the secretion of which hormones?

• A. TSH
• B. FSH
• C. Epinephrine and Norepinephrine
• D. ACTH

Answer: (C)

Pheochromocytoma is a tumor of the adrenal medulla that overproduces catecholamines. The two main hormones involved are epinephrine and norepinephrine, whose excess drives the hallmark sympathetic responses—episodes of high blood pressure, tachycardia, sweating, headaches, and palpitations. The other hormones listed (TSH, FSH, ACTH) are produced by other parts of the endocrine system and are not the ones secreted in excess by pheochromocytoma. So, the disturbance is in epinephrine and norepinephrine.