What signs are commonly associated with hyperthyroidism?

In hyperthyroidism, the thyroid gland produces excessive levels of thyroid hormones, which significantly increase the body's metabolism. This heightened metabolic state is typically associated with weight loss, as the body utilizes energy at a faster rate. Individuals often experience an increased appetite because the body requires more fuel to meet its elevated metabolic demands, but despite consuming more food, they still lose weight due to this metabolic imbalance.

This condition can also lead to other symptoms such as increased heart rate, nervousness, irritability, and heat intolerance, further emphasizing the hyperactive state of the body’s processes. The combination of weight loss and increased appetite is a hallmark sign of hyperthyroidism, making this the correct answer.