Hypothyroidism is a condition in which the thyroid is not active enough and doesn't make enough thyroid hormone.

• A. Tremors
• B. Weight gain and cold intolerance
• C. Weight loss and heat intolerance
• D. Frequent diarrhea

Answer: (B)

Lower thyroid hormone slows the body’s metabolism, which commonly leads to weight gain and cold intolerance because the body burns fewer calories and generates less heat. Tremors, weight loss with heat intolerance, and frequent diarrhea are more typical of an overactive thyroid, which speeds metabolism. So the symptom pair described—weight gain and cold intolerance—best fits hypothyroidism. In practice this is confirmed with labs showing low T4/T3 and often elevated TSH, and treated with thyroid hormone replacement.