Final answer:
Heat exhaustion is often the first sign of trouble with the heat, characterized by symptoms such as heavy sweating, dizziness, and weakness.
Step-by-step explanation:
Heat exhaustion is often the first sign that the body is having trouble with the heat. It occurs when the body overheats due to prolonged exposure to high temperatures and inadequate hydration. Symptoms may include heavy sweating, dizziness, nausea, headache, and weakness. It is important to rest in a cool place, drink plenty of fluids, and seek medical attention if symptoms worsen.
Learn more about Heat illnesses