What causes Graves disease?

• A. Autoantibodies stimulating thyroid hormone overproduction
• B. Viral infections damaging thyroid cells
• C. Chronic inflammatory response
• D. Infections of the thyroid gland

Answer: (A)

Graves disease is primarily caused by the production of autoantibodies that stimulate the thyroid gland to overproduce thyroid hormones, leading to hyperthyroidism. These autoantibodies specifically target the thyroid-stimulating hormone (TSH) receptor, mimicking the action of TSH itself. This results in excessive production of thyroid hormones, which can cause symptoms such as weight loss, increased heart rate, and anxiety.

The other choices, while related to thyroid conditions, do not accurately describe the primary cause of Graves disease. Viral infections might lead to thyroid dysfunction, but they do so in different contexts and mechanisms, rather than through autoimmune activity. Chronic inflammatory responses and infections of the thyroid can also lead to thyroid-related disorders, but they do not specifically cause Graves disease. Thus, the correct answer highlights the autoimmune nature of Graves disease, emphasizing the role of autoantibodies in its pathophysiology.