Which thyroid disorder is classically associated with heat intolerance and exophthalmos?

• A. Hyperthyroidism
• B. Hypothyroidism
• C. Goiter
• D. Thyroiditis

Answer: (A)

Heat intolerance and exophthalmos together point to an overactive thyroid state. Excess thyroid hormone raises the body's overall metabolic rate, leading to heat production, sweating, and a feeling of being warm. Exophthalmos is most characteristic of Graves disease, an autoimmune form of hyperthyroidism, where immune activity damages orbital tissues and causes swelling and protrusion of the eyes. So the combination of these two signs is a classic clue to hyperthyroidism, particularly Graves disease. Other options don’t typically present with both features: hypothyroidism tends to cause cold intolerance and weight gain; a goiter is merely thyroid enlargement that can occur with many conditions; thyroiditis is inflammatory and can cause variable thyroid function but not the classic exophthalmos.