Which symptom is most consistent with hyperthyroidism?

• A. Weight gain
• B. Cold intolerance
• C. Weight loss
• D. Heat intolerance

Answer: (D)

Hyperthyroidism speeds up the body's metabolism, meaning more heat is produced and the body works harder overall. That excess metabolic activity leads to heat intolerance, sweating, and often weight loss because calories burn more quickly even if appetite rises. Cold intolerance points to hypothyroidism, where metabolism is slowed, and weight gain is common rather than weight loss. Heat intolerance is the most characteristic symptom of hyperthyroidism among the options, making it the best choice.