Which of the following is NOT a symptom of heat stress?

High fever is not typically considered a symptom of heat stress. Heat stress mainly arises when the body struggles to maintain its normal temperature, often due to excessive heat exposure or exertion in hot conditions. When the body experiences heat stress, it primarily responds through mechanisms like heavy sweating to cool down, which can lead to symptoms such as dehydration and severe thirst. Headache is also common, as dehydration affects the body's balance and can cause discomfort, especially in hot environments.

On the other hand, while a high fever indicates an overall rise in body temperature, it is generally a sign of illness or infection rather than a direct symptom of heat stress. The body usually cannot maintain a fever during extreme heat conditions due to the dysregulation of normal thermoregulatory functions. Thus, understanding these different responses helps distinguish between symptoms associated with heat stress and those resulting from other medical conditions.