What is a characteristic symptom of hyperthyroidism?

Hyperthyroidism is characterized by an overproduction of thyroid hormones, leading to an increase in the metabolic rate of the body. This heightened metabolic state can result in various symptoms, one of the most prominent being high metabolism. Individuals with hyperthyroidism often experience increased energy expenditure, which can lead to symptoms such as weight loss despite an increased appetite, rapid heartbeat, and heat intolerance.

In contrast to high metabolism, symptoms like low metabolism, weight gain, and cold intolerance are typically associated with hypothyroidism, where there is a deficiency of thyroid hormones, leading to a decreased metabolic rate. This distinction is crucial in understanding the physiological effects of thyroid hormone levels and their impact on metabolism and overall bodily functions. Thus, recognizing that high metabolism is a hallmark of hyperthyroidism helps in differentiating it from other thyroid disorders.