Hyperthermia is an abnormally high body temperature caused by a failure of the heat-regulating mechanisms in the body to deal with the heat coming from the environment. Heat stroke, heat syncope (sudden dizziness after prolonged exposure to the heat), heat cramps, heat exhaustion and heat fatigue are common forms of hyperthermia. People can be at increased risk for these conditions, depending on the combination of outside temperature, their general health and individual lifestyle.

Older people, particularly those with chronic medical conditions, should stay indoors, preferably with air conditioning or at least a fan and air circulation, on hot and humid days, especially when an air pollution alert is in effect. Living in housing without air conditioning, not drinking enough fluids, not understanding how to respond to the weather conditions, lack of mobility and access to transportation, overdressing and visiting overcrowded places are all lifestyle factors that can increase the risk for hyperthermia.

People without air conditioners should go to places that do have air conditioning, such as senior centers, shopping malls, movie theaters and libraries. Cooling centers, which may be set up by local public health agencies, religious groups and social service organizations in many communities, are another option.

The risk for hyperthermia may increase from:
• Age-related changes to the skin such as poor blood circulation and inefficient sweat glands
• Alcohol use
• Being substantially overweight or underweight
• Dehydration
• Heart, lung and kidney diseases, as well as any illness that causes general weakness or fever
• High blood pressure or other health conditions that require changes in diet. For example, people on salt-restricted diets may be at increased risk. However, salt pills should not be used without first consulting a physician.
• Reduced perspiration, caused by medications such as diuretics, sedatives, tranquilizers and certain heart and blood pressure drugs
• Use of multiple medications. It is important, however, to continue to take prescribed medication and discuss possible problems with a physician.

Heat stroke is a life-threatening form of hyperthermia. It occurs when the body is overwhelmed by heat and is unable to control its temperature. Heat stroke occurs when someone’s body temperature increases significantly (above 104 degrees Fahrenheit) and shows symptoms of the following: strong rapid pulse, lack of sweating, dry flushed skin, mental status changes (like combativeness or confusion), staggering, faintness or coma. Seek immediate emergency medical attention for a person with any of these symptoms, especially an older adult.

If you suspect someone is suffering from a heat-related illness:
• Get the person out of the heat and into a shady, air-conditioned or other cool place. Urge the person to lie down.
• If you suspect heat stroke, call 911.
• Apply a cold, wet cloth to the wrists, neck, armpits and/or groin. These are places where blood passes close to the surface of the skin, and the cold cloths can help cool the blood.
• Help the individual to bathe or sponge off with cool water.
• If the person can swallow safely, offer fluids such as water or fruit and vegetable juices, but avoid alcohol and caffeine.

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