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heat waves

overview

the heat index helps people identify days when the risk for a heat illness is higher than normal. during a heat wave, the heat index is excessive for many days in a row. everyone has an increased risk for a heat-related illness during a heat wave.

a heat-related illness can be more serious for:

  • older adults, who may not notice excessive heat, do not sweat as effectively, or do not feel thirsty.
  • infants and children, who can't transfer heat very well.
  • people with chronic medical conditions, such as heart disease, mental illness, or being overweight..
  • people with developmental problems.

other things that affect a person's risk for a heat-related illness during a heat wave include:

  • living in cities, because heat is trapped by tall buildings and air pollutants.
  • living alone.
  • working outdoors.
  • exercising outside.
  • not having cooling devices, such as fans or air-conditioning.

related information

credits

current as of: october 24, 2023

author: healthwise staff
clinical review board
all healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

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this information does not replace the advice of a doctor. healthwise, incorporated, disclaims any warranty or liability for your use of this information. your use of this information means that you agree to the terms of use and privacy policy. to learn more about healthwise, visit healthwise.org. © 1995-2022 healthwise, incorporated. healthwise, healthwise for every health decision, and the healthwise logo are trademarks of healthwise, incorporated.

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