Signs and symptoms of heat exhaustion may develop suddenly, or over time, especially with prolonged periods of exercise. Possible heat exhaustion symptoms include:

  • Cool, moist skin with goose bumps when in the heat
  • Heavy sweating
  • Faintness
  • Dizziness
  • Fatigue
  • Weak, rapid pulse
  • Low blood pressure upon standing
  • Muscle cramps
  • Nausea
  • Headache

When to see a doctor

If you think you're experiencing heat exhaustion:

  • Stop all activity and rest
  • Move to a cooler place
  • Drink cool water or sports drinks

Contact your doctor if your signs or symptoms worsen or if they don't improve within one hour. Seek immediate medical attention if your body temperature reaches 104 F (40 C) or higher.

Nov. 18, 2011