Heatstroke: Symptoms & Signs

Medically Reviewed on 5/5/2021

Heatstroke refers to the most severe form of heat-related illness that occurs when the body's system for temperature regulation has failed. It is more severe than heat exhaustion or dehydration.

Signs and symptoms begin with symptoms of heat exhaustion and include

These symptoms and signs can progress to those of heatstroke, involving seizures, confusion, and lethargy. With heatstroke, the body temperature can exceed 106 F (41 C) and sweating stops. Heatstroke is a life-threatening condition that requires emergency medical attention.

Causes of heatstroke

Prolonged exposure to high temperatures or physical exertion in high temperatures causes heatstroke.

Other heatstroke symptoms and signs


Emotional trauma is best described as a psychological response to a deeply distressing or life-threatening experience. See Answer

Subscribe to MedicineNet's Skin Care & Conditions Newsletter

By clicking "Submit," I agree to the MedicineNet Terms and Conditions and Privacy Policy. I also agree to receive emails from MedicineNet and I understand that I may opt out of MedicineNet subscriptions at any time.

Jameson, J. Larry, et al. Harrison's Principles of Internal Medicine, 20th Ed. New York: McGraw-Hill Education, 2018.