Which symptom best describes hyperthyroidism?

• A. Weight gain and cold intolerance
• B. Weight loss, heat intolerance, irritability
• C. Tremors and bradycardia
• D. Dry skin and hair loss

Answer: (D)

Hyperthyroidism raises the body's metabolism and sympathetic activity, so you see symptoms like weight loss, heat intolerance, and irritability as the body runs hot and burns energy faster, with more CNS stimulation. Tremors and a fast pulse are common too, because of this increased activity. Dry skin and hair loss are more typical of hypothyroidism, where thyroid hormone is low and metabolism slows. So the symptom set that best fits hyperthyroidism is weight loss with heat intolerance and irritability, reflecting the heightened metabolic rate and nervous system excitation.