Health A-Z

Medical Content Created by the Faculty of the Harvard Medical School



Heat stroke can come on suddenly, but warning symptoms often appear first. They include:

  • Abdominal cramps

  • Muscle cramps

  • Nausea

  • Vomiting

  • Headache

  • Dizziness

  • Weakness

  • Heavy sweat or a lack of sweat

When heat stroke starts, neurological symptoms can include:

  • Odd or bizarre behavior

  • Irritability

  • Delusions

  • Hallucinations

  • Seizures

  • Coma

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From Health A-Z, Harvard Health Publications. Copyright 2007 by the President and Fellows of Harvard College. All rights reserved. Written permission is required to reproduce, in any manner, in whole or in part, the material contained herein. To make a reprint request, contact Harvard Health Publications. Used with permission of StayWell.

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