Question

Graves' disease is due to

• A. Hyperactivity of thymus
• B. Hypoactivity of thymus
• C. Hyperactivity of thyroid
• D. Hypoactivity of thyroid

Answer 1

Answer: (C)

Hyperactivity of thyroid

Grave's disease is known as Exophthalmic goitre. It occurs in adults due to thyrotoxicosis. It occurs due to over secretion of thyroid hormone i.e. thyroxine due to increased secretion of TSH (Thyroid stimulating hormone) from anterior pituitary. In exophthalmic goitre, protrusion of eyeballs occur due to deposition of excess fat behind the eyes. Hence, Grave's disease occurs due to hyperactivity of thyroid.

So, the correct answer is 'Hyperactivity of thyroid'.