Which of the following is NOT a symptom of hyperthyroidism?

• A. Fatigue
• B. Exophthalmos
• C. Tachycardia
• D. Tremor of extremities

Answer: (A)

Fatigue is typically associated with hypothyroidism rather than hyperthyroidism. In hyperthyroidism, symptoms often include heightened energy levels, weight loss, increased appetite, and an overall feeling of restlessness or anxiety.

On the other hand, exophthalmos, which is a protrusion of the eyes, is a specific and well-known symptom often associated with Graves' disease, a common cause of hyperthyroidism. Tachycardia, or an increased heart rate, is frequently seen in individuals with hyperthyroidism due to the accelerated metabolism that the condition causes. Tremor of the extremities is another common symptom of hyperthyroidism, resulting from increased adrenergic activity.

Thus, while fatigue can frequently be a symptom of various conditions, its association with hyperthyroidism is not typical, making it the correct answer in this context.