Which autoimmune disease is associated with hyperthyroidism?

• A. Hashimoto's thyroiditis
• B. Graves disease
• C. Subacute thyroiditis
• D. Cretinism

Answer: (B)

Graves disease is an autoimmune disorder that is specifically associated with hyperthyroidism. In Graves disease, the immune system produces antibodies known as thyroid-stimulating immunoglobulins (TSIs) that bind to the thyroid gland’s receptors. This leads to an overstimulation of the thyroid hormones (primarily thyroxine), resulting in an overproduction of these hormones and the clinical manifestations of hyperthyroidism, such as weight loss, increased heart rate, anxiety, and heat intolerance.

This condition differs significantly from others listed. For example, Hashimoto's thyroiditis primarily causes hypothyroidism due to the immune system attacking the thyroid gland, leading to decreased hormone production. Subacute thyroiditis is often a temporary condition characterized by pain and may result in fluctuating thyroid hormone levels but not specifically hyperthyroidism in the same way as Graves disease. Cretinism, which is often a consequence of congenital hypothyroidism, is not associated with hyperthyroidism, as it relates to insufficient thyroid hormone levels during critical periods of growth and development.

Thus, Graves disease is the condition most directly linked to hyperthyroidism among the options provided.