What symptom is commonly associated with hyperthyroidism?

Weight loss is a common symptom associated with hyperthyroidism due to the increased metabolic rate that occurs with elevated thyroid hormone levels. In hyperthyroidism, the body’s metabolism accelerates, leading to the consumption of energy reserves and breakdown of body tissues, which can result in weight loss despite normal or increased appetite. This symptom is often accompanied by others such as increased heart rate, anxiety, and sweating.

Conversely, weight gain is typically associated with hypothyroidism, where a decrease in metabolic rate leads to weight retention. Cold intolerance is also more characteristic of hypothyroidism, as the body struggles to generate heat. Fatigue can occur in hyperthyroidism but is often more pronounced in hypothyroidism due to overall body sluggishness and lack of energy. Thus, weight loss distinctly marks hyperthyroidism's clinical presentation.