Older people can face risks related to hot weather. As people age, their bodies lose some ability to adapt to heat. They may have medical conditions that are worsened by heat. And their medications could reduce their ability to respond to heat.

The National Institute on Aging (NIA), part of the National Institutes of Health, has some advice for helping older people avoid heat-related illnesses, known collectively as hyperthermia.

Hyperthermia occurs when the body overheats. Conditions involving hyperthermia have different names, including heat stroke, heat fatigue, heat syncope (lightheadedness or fainting in the heat), heat cramps and heat exhaustion.

Health-related factors that may increase the risk of hyperthermia include:

Lifestyle factors that can also increase the risk of hyperthermia include hot living quarters, lack of transportation, overdressing, visiting overcrowded places, and not understanding how to respond to weather conditions. Older people, particularly those at special risk, should pay attention to any air pollution alert in effect. People without fans or air conditioners should go to shopping malls, movie theaters, libraries or other places with air conditioning. In addition, they can visit cooling centers which are often provided by government agencies, religious groups and social service organizations in many communities.

Heat stroke is an advanced form of hyperthermia. It occurs when the body is overwhelmed by heat and unable to control its temperature. In heat stroke, the body temperature is at least 104 degrees Fahrenheit. Someone with heat stroke may have a strong rapid pulse, lack of sweating, dry flushed skin, faintness, staggering and mental status changes such as confusion, combativeness, disorientation or even coma. Seek immediate medical attention for a person with any of these symptoms, especially an older adult.

If you suspect that someone is suffering from a heat-related illness:

The Low Income Home Energy Assistance Program (LIHEAP) within the Administration for Children and Families in the U.S. Department of Health and Human Services helps eligible households pay for home cooling and heating costs. Individuals interested in applying for assistance should contact their local or state LIHEAP agency. For more information, go to www.acf.hhs.gov/programs/ocs/liheap/ or www.acf.hhs.gov/programs/ocs/liheap/brochure/brochure.html.

For a free copy of the NIA’s AgePage on hyperthermia in English or in Spanish, contact the NIA Information Center at 1-800-222-2225 or go to http://www.niapublications., or www.niapublications.org/agepages/hyperther-sp.asp for the Spanish-language version.

The NIA leads the federal government effort conducting and supporting research on aging and the health and well-being of older people. The Institute’s broad scientific program seeks to understand the nature of aging and to extend the healthy, active years of life. For more information on research, aging, and health, go to www.nia.nih.gov.

About the National Institutes of Health (NIH): NIH, the nation's medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit www.nih.gov.

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