Which condition is characterized by headache, nausea, and elevated body temperature?

Heat exhaustion is characterized by symptoms such as headache, nausea, and elevated body temperature, among others. This condition typically occurs when the body loses an excessive amount of water and salt through perspiration, especially in hot environments or during vigorous physical activity. The body struggles to regulate its temperature, leading to these symptoms as it becomes increasingly overwhelmed by heat.

In heat exhaustion, headache and nausea are common indicators of the body's response to overheating and electrolyte imbalance. Elevated body temperature is also a key symptom, as the body's thermoregulation systems attempt to cope with the excessive heat by perspiring. However, unlike heat stroke, heat exhaustion does not usually cause severe alterations in mental state or behavior.

Other conditions such as dehydration do not always present with elevated body temperature or nausea without more severe symptoms. Hyperthermia can include heat exhaustion but is a broader term referring to an increased body temperature without the compensatory mechanisms functioning effectively. Sunburn primarily causes skin damage and pain, not the systemic symptoms like those caused by heat exhaustion.