Which statement NOT a typical sign of hyperfunctional thyroid?

• A. Weight loss
• B. Diarrhea
• C. Weight gain
• D. Increased metabolism

Answer: (C)

Hyperthyroidism speeds up many bodily processes. When thyroid hormones are high, the body's basal metabolic rate rises, promoting catabolism of fat and muscle and increasing energy use. This higher energy expenditure usually leads to weight loss, even if appetite is increased. The same hormonal effect also speeds up gut motility, which can cause diarrhea. The overall state is an increased metabolism and sympathetic activity, leading to symptoms like heat intolerance and tremors, not weight gain. Therefore, weight gain is not a typical sign of a hyperfunctional thyroid, while weight loss, diarrhea, and increased metabolism are.