Which of the following is the LEAST likely symptom of hyperthyroidism in a 77-year-old man?
**Core Concept**
Hyperthyroidism is a condition characterized by an excess of thyroid hormones (T3 and T4) in the body, leading to various systemic effects. In the elderly, hyperthyroidism can manifest differently than in younger individuals, with a higher likelihood of atypical symptoms.
**Why the Correct Answer is Right**
In a 77-year-old man with hyperthyroidism, the most common symptoms include weight loss, palpitations, tremors, and anxiety. However, elderly patients may exhibit atypical symptoms due to decreased reserve capacity and comorbidities. Among the options, muscle weakness is a less common initial presentation of hyperthyroidism in the elderly, as the body's response to excess thyroid hormones can be masked by age-related muscle wasting and decreased physical activity.
**Why Each Wrong Option is Incorrect**
**Option A:** Weight loss is a common symptom of hyperthyroidism, as increased metabolism leads to a higher caloric expenditure.
**Option B:** Palpitations are a frequent complaint in patients with hyperthyroidism, due to the increased heart rate and contractility caused by excess thyroid hormones.
**Option D:** Anxiety is a common psychological symptom of hyperthyroidism, resulting from the increased metabolic rate and autonomic nervous system stimulation.
**Clinical Pearl / High-Yield Fact**
In elderly patients with suspected hyperthyroidism, it's essential to consider atypical presentations, such as muscle weakness, fatigue, and decreased libido, which may be more common in this age group.
**Correct Answer:** C.