With extreme heat expected to intensify across 2026, the U.S. faces ongoing heat illness deaths—more than 700 each year—making it crucial to distinguish heat exhaustion from heatstroke, recognize the symptoms early, and take practical steps to cool down and ge
The first blistering days of summer can feel survivable—until the body loses its ability to cool itself.
The Federal Emergency Management Agency warns that extreme heat makes it difficult to keep body temperature within a normal range. setting off a chain of heat-related conditions. And with the summer of 2026 expected to be hotter than normal—pushed by extreme heat. heat domes. and a greater risk of getting sick from the heat—the difference between heat exhaustion and heatstroke can be the difference between a quick recovery and a life-threatening emergency.
In the United States, more than 700 people die from extreme heat every year, according to the Centers for Disease Control and Prevention. Across Europe, at least 40 people have drowned while swimming in lakes or canals in attempts to escape an intense heat wave baking the continent.
Heat affects everyone differently, and knowing the warning signs—and what to do right away—is where prevention turns into real protection.
Extreme heat doesn’t just make people uncomfortable. The National Weather Service warns that “extreme heat and humidity will significantly increase the potential for heat-related illnesses. particularly for those working or participating in outdoor activities.” Humidity can trap heat and overload the body’s cooling system.
The CDC describes heat exhaustion as a milder form of illness than heat stroke. Heat stroke, the agency says, is a life-threatening emergency.
When heatstroke strikes, time matters. The CDC recommends immediate action for people suffering from heatstroke, emphasizing that it is an emergency.
Heat exhaustion is not “safe,” but it carries a different level of urgency. The CDC outlines steps for first aid for heat exhaustion, distinguishing it from heat stroke while still treating it as a condition that requires prompt help.
Even when symptoms are recognized, the risk factors are not always obvious. The CDC lists age, weight, fever, dehydration, heart disease, poor circulation, and sunburn as factors that determine a person’s ability to cool off in hot weather. Alcohol and drug use can also be factors.
The agency says those at greatest risk include people:
Ages 65 and older.
Age 2 or younger.
Suffering from chronic diseases or mental illness.
The CDC also stresses that young and healthy people can still get heat illness if they’re active in hot weather.
For families and communities, prevention can start with habits that don’t require special equipment—just consistency. The FEMA guidance stresses understanding how heat affects the body, then acting before symptoms appear.
Drink water, more than usual, no matter how active you are. Don’t wait until you’re thirsty. Make sure pets have plenty to drink as well.
Avoid liquids with large amounts of sugar, alcohol or caffeine, since these can increase body fluid loss.
Stay in air-conditioned buildings as much as possible. Take cool showers or baths when you can.
Limit outdoor activity, especially in the middle of the day.
Use drapes or shades on windows to keep out the sun.
Limit oven and stove use to keep in-home temperatures lower.
Wear light-colored, loose-fitting clothing to improve perspiration evaporation.
The CDC’s guidance also reaches beyond individual behavior. Check on the well-being of friends and neighbors—do they need help staying cool?
And follow one rule without exception: never leave people or pets in a closed car, even with partially open windows. The vehicle interior can rapidly reach dangerous temperatures.
Because heat illnesses can look similar at first—especially when conditions involve both high temperatures and humidity—the safest move is to take symptoms seriously and seek immediate medical care for those with symptoms of heat illness.
Heat domes don’t just change the weather. They change risk. And right now, the public health message is clear: know the signs, cool the body early, and treat heatstroke as the emergency it is.
heat exhaustion heatstroke extreme heat CDC FEMA National Weather Service heat index prevention tips first aid dehydration