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Heat Exhaustion

Heat exhaustion is a milder form of heat-related illness that can develop after several days of exposure to high temperatures and inadequate or unbalanced replacement of fluids. Those most prone to heat exhaustion are elderly people, people with high blood pressure, and people working or exercising in a hot environment.

Recognizing Heat Exhaustion

Warning signs of heat exhaustion include:

heavy sweating
paleness
muscle cramps
tiredness
weakness
dizziness
headache
nausea or vomiting
fainting

The skin may be cool and moist. The victim's pulse rate will be fast and weak, and breathing will be fast and shallow. If heat exhaustion is untreated, it may progress to heat stroke. Seek medical attention immediately if:

symptoms are severe, or
the victim has heart problems or high blood pressure.

Otherwise, help the victim to cool off, and seek medical attention if symptoms worsen or last longer than 1 hour.

What to Do

Cooling measures that may be effective include:

cool, non-alcoholic beverages, as directed by your physician
rest
cool shower, bath, or sponge bath
an air-conditioned environment
Lightweight clothing

Based on a CDC Prevention Guide for Emergencies and Disasters.

Heat Exhaustion Center - Featured Article

Heat Exhaustion Main Article from MedicineNet:
Heat exhaustion is a milder form of heat-related illness that can develop after several days of exposure to high temperatuers and inadequate or unbalanced replacement fluids. Warning signs of heat exhaustion include heavy sweating, paleness, muscle cramps, tiredness, weakness, dizziness, headache, nausea or vomiting, and fainting.