Which of the following is NOT a type of heat injury?

The correct response identifies "cold stress" as not being a type of heat injury. Heat injuries typically occur due to the body overheating and can manifest in various forms such as heat cramps, heat exhaustion, and heat stroke.

Heat cramps are painful muscle spasms caused by dehydration and electrolyte imbalances from excessive sweating. Heat exhaustion is a more severe condition that arises when the body loses too much water and salt, leading to symptoms like weakness, dizziness, and excessive sweating. Heat stroke is the most critical heat-related condition, characterized by a dangerously high body temperature, confusion, and a lack of sweating, which can be life-threatening if not treated promptly.

In contrast, cold stress refers to the adverse effects of cold temperatures on the body, which could lead to hypothermia or frostbite, rather than the heat-related conditions mentioned. Therefore, cold stress does not belong in the category of heat injuries, as it deals with the opposite end of the temperature spectrum.