Which of the following might indicate an individual is suffering from hyperthyroidism?

The indication of rapid heartbeat and irritability as symptoms of hyperthyroidism is indeed correct. Hyperthyroidism is a condition characterized by an overactive thyroid gland, which produces excess thyroid hormones. These hormones are responsible for regulating metabolism and can significantly increase heart rate, leading to symptoms such as palpitations or a rapidly beating heart. Additionally, individuals may experience heightened anxiety and irritability due to the body's increased metabolism and heightened alertness caused by excess hormones.

The combination of a rapid heartbeat and irritability is therefore a classic presentation of hyperthyroidism, reflecting the physiological changes and stress responses elicited by the condition. Understanding these symptoms helps recognize hyperthyroidism early, enabling proper management and treatment of the condition.