A patient presents with enlarged thyroid, nervousness, rapid pulse, and thin build. Which symptom is most likely associated?

• A. Heat intolerance
• B. Weight gain
• C. Constipation
• D. Irregular or heavy menses

Answer: (A)

When thyroid hormone is in excess, the body's metabolism shoots up, producing more internal heat. This is why heat intolerance is a hallmark symptom: people feel unusually warm and may sweat easily, even if the environment isn’t hot. The other signs you described—nervousness and a rapid pulse—fit this same hyperthyroid picture, and a thin build reflects the increased energy use and weight loss often seen with overactive thyroid. Weight gain would be unlikely because metabolism is accelerated and energy breakdown is higher. Constipation would also be less likely since intestinal motility tends to increase, not slow down, with excess thyroid hormone. Menstrual irregularities can occur but aren’t as specific or reliable a clue as heat intolerance in this context.