What is a sign that a person may be suffering from heat stroke?

A sign that indicates a person may be suffering from heat stroke is altered mental status. Heat stroke occurs when the body's temperature regulation fails and the core body temperature rises to dangerous levels, typically greater than 104°F (40°C). This extreme internal temperature can affect brain function, leading to confusion, disorientation, or even unconsciousness. It's essential to recognize this symptom quickly, as heat stroke can progress rapidly and can be life-threatening.

Other signs of heat stroke can include hot and dry skin, high heart rate, and failure to sweat, but the altered mental status is particularly critical because it signifies potential neurological involvement. Recognizing such a symptom can prompt immediate medical intervention, which is crucial in preventing severe complications or death.

The other options provided do not accurately reflect the physiological changes associated with heat stroke. For instance, a normal body temperature or cold, clammy skin would indicate different conditions, and heightened thirst, while a symptom of dehydration, is not specific to heat stroke and may be seen in less severe heat-related illnesses.