Which of the following is NOT a listed cause of hypothermia?

• A. Environmental exposure
• B. Hyperthyroidism
• C. Hypoglycemia
• D. CNS dysfunction

Answer: (B)

Hypothermia results from a drop in core body temperature due to reduced heat production, increased heat loss, or impaired thermoregulation. Environmental exposure is a classic external cause—being in a cold environment can drive temperature down. CNS dysfunction can disrupt the hypothalamic control of body temperature, leading to hypothermia, while hypoglycemia can blunt metabolic heat production and shivering, worsening cooling. Hyperthyroidism, however, increases metabolic heat production and promotes heat intolerance, making hyperthermia (not hypothermia) more likely. So hyperthyroidism is not a listed cause of hypothermia.