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The presence of signs of fatigue and excessive sweating is a clear indicator that heat stress may be developing among workers. When the body is exposed to high temperatures, it attempts to cool itself through sweating. An increase in sweating can be a normal physiological response to heat; however, when it becomes excessive and is accompanied by fatigue, it suggests that the body is struggling to regulate its temperature effectively. This condition could lead to more serious heat-related illnesses, such as heat exhaustion or heat stroke, if not addressed promptly.

In contrast, an increase in productivity or higher morale might indicate that workers are feeling well and engaged, which would not typically suggest heat stress. Similarly, less interaction among employees may reflect a number of factors, but it does not specifically indicate heat-related issues. Recognizing the key signs and symptoms of heat stress, such as fatigue and sweating, is crucial for ensuring the safety and wellbeing of workers in environments with potentially high temperatures.