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Extreme Heat and Heart Health: Essential FAQ
Extreme heat is the leading weather-related cause of death in the U.S., placing significant strain on the heart and increasing the risk of cardiovascular complications. The American Heart Association warns that heat-related cardiovascular deaths could more than double in the coming decades.
Heat forces the heart to work harder by increasing heart rate and expanding blood vessels to cool the body. This added strain can be dangerous, especially for people with heart disease, but even healthy individuals are at risk.
Extreme heat is the leading weather-related cause of death in the United States, according to the National Weather Service.
A report in the Journal of the American Medical Association found that more than 2,300 people died from heat exposure in the U.S. in 2023.
Symptoms include headache, cool/pale/clammy skin, fast but weak pulse, dizziness or fainting, weakness or muscle cramps, and nausea or vomiting.
Heat stroke is a medical emergency. Call 9-1-1 immediately if you notice body temperature above 103°F, hot/red/dry or damp skin, rapid strong pulse, confusion, headache, or loss of consciousness.
Avoid outdoor activity between noon and 3 p.m., wear lightweight light-colored clothing, stay hydrated with water, avoid alcohol and caffeine, and take breaks in shade or cool indoor spaces.
Slow down physical activity, move to a cooler place, cool down immediately with cold water, rehydrate, and seek medical attention if needed.