What abnormality is most likely in a person with hyperthyroidism?

In a person with hyperthyroidism, the most likely abnormality observed is hypertension. Hyperthyroidism causes an increase in metabolic rate, which often leads to an elevation in the heart rate (tachycardia), increased cardiac output, and ultimately, higher blood pressure. The excess thyroid hormone stimulates various bodily processes, including those impacting the cardiovascular system, contributing to hypertension.

In contrast, low body temperature, slow heart rate, and increased sensitivity to cold are more typically associated with hypothyroidism, where the body’s metabolism slows down due to insufficient thyroid hormone. In this condition, individuals may feel cold and have a lower than normal body temperature as their body struggles to maintain energy levels. This helps to distinguish hyperthyroidism from hypothyroidism and reinforces the link between thyroid hormone levels and cardiovascular health.