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Specific symptoms of types of heat illness

Heatstroke - usually fatal unless emergency medical treatment is provided immediately. Body temperature from 102 - 104 oF or higher within 10-15 minutes.


  • No sweating, hot and dry skin (e.g., red, bluish), muscles may twitch
  • Headache, confusion, convulsions, dizziness
  • Pulse fast / weak, shallow breathing
  • Seizures, fits, unconsciousness, coma

Heat Exhaustion - skin feels cool but the body temperature may be dangerously high.


  • Heavy sweating, muscle cramps
  • Extreme weakness and fatigue, nausea and vomiting
  • Headache, dizziness, fainting
  • Pulse fast / weak, shallow breathing

Fainting - sudden dizziness, unconsciousness.

Heat Cramps - painful muscle spasms that may occur during work or at night.

Heat Rash - pimples / small blisters in various parts of the body.