Known heat exposure with temperature 37-40C with:
Tachycardia
Sweating (especially when associated with exercise)
Nausea or vomiting
Headache
Fatigue, weakness
Dizziness
Orthostatic hypotension with normal mental status
Mentation is normal (in contrast to heatstroke)
Heat exhaustion
Heat cramps
Malignant hyperthermia
Heat edema
Heat stroke
Nitrogen narcosis
Heat tetany
Hemorrhagic shock