Which of the following is a symptom of hypothyroidism?

Cold intolerance is a classic symptom of hypothyroidism, a condition characterized by the underproduction of thyroid hormones. Thyroid hormones play a crucial role in regulating metabolism and maintaining the body's energy levels. When these hormones are deficient, the body's ability to generate heat is diminished, causing individuals to feel excessively cold, even in normal temperature environments. This symptom is often accompanied by other signs of hypothyroidism, such as fatigue, weight gain, and dry skin, reflecting the overall slowdown of metabolic processes.

The other symptoms presented, like increased heart rate, weight loss, and increased perspiration, are more commonly associated with hyperthyroidism, where the thyroid gland produces an excess of hormones, leading to an accelerated metabolism and heightened bodily functions. These differences highlight the crucial role of thyroid hormones in maintaining homeostasis and demonstrate how imbalances can manifest distinct symptoms.