What are the symptoms of heat illness?

Heat illness occurs when the body is unable to properly regulate its temperature, often due to excessive exposure to high temperatures, particularly during strenuous activities. The symptoms listed in the correct choice encompass a wide range of physiological signs that indicate the body is reacting negatively to heat.

Tiredness, weakness, and headache can arise as the body struggles to cope with elevated temperatures, leading to fatigue and exertion. Sweating is one of the body's primary mechanisms for cooling down—however, excessive sweating can also lead to dehydration, which links directly to feelings of tiredness and weakness. Nausea and dizziness are common symptoms as the body begins to malfunction under heat stress, and fainting can occur if the body becomes too overwhelmed. Recognizing these symptoms is crucial for timely intervention, which can prevent progression to more severe forms of heat illness, such as heat exhaustion or heat stroke.

The other options do not relate specifically to heat illness; for instance, symptoms like depression, cold extremities, or respiratory issues such as a persistent cough are not indicative of the body’s response to heat stress. Understanding the symptoms specific to heat illness helps ensure that individuals can respond effectively to mitigate risks associated with high temperatures during work or recreational activities.