Symptoms of heat-related illness can happen in any order. You don't need to have every symptom in a category to have heat illness.

Stop what you're doing, get cool, get shade and drink fluids. Call 911 for immediate help.

Table source: NIOSH First Aid for Heat Illness Fact Sheet (PDF)
Illnesses Caused by HeatSigns and SymptomsWhat to Do
Heat rashRed cluster of pimples or small blisters
  • Move to cooler, less humid areas
  • Keep rash area dry; do not use ointments or creams
Heat crampsMuscle cramps, pain or spasms in abdomen, arms or legs
  • Drink fluids
  • Get medical help
Heat fainting
  • Fainting, dizziness
  • Light-headedness after standing or suddenly rising from a sitting/lying position
  • Sit or lie down in a cool place
  • Slowly drink water or clear juice
Heat exhaustion
  • Headache
  • Nausea
  • Dizziness
  • Weakness
  • Thirst
  • Heavy sweating
  • Irritability
  • Get medical help
  • Move from hot area and take frequent sips of liquids
  • Use cold compresses, ice bath, fans
Heat stroke
  • Confusion, altered mental state
  • Slurred speech
  • Loss of consciousness
  • Hot, dry skin
  • Seizures
  • This is a medical emergency. Get help immediately.
  • Move to a cool place
  • Remove clothing and:
    • Immerse in tub of ice water,
    • Place in tarp with ice or
    • Apply cold, wet towels to entire body

 

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