We know that too much sun exposure can be harmful to our health, potentially causing skin damage and cancer. But now, a new study found that the immune system reacts to high temperatures, causing dangerous inflammation that could lead to increased rates of heart attack, stroke, and other cardiovascular issues.

Even short periods of exposure to high heat outdoors can trigger concerning reactions.

The research, presented Tuesday at the American Heart Association’s Epidemiology, Prevention, Lifestyle, and Cardiometabolic Health Conference in Chicago, found a link between hot weather and measures of the body’s immune response, including levels of certain blood cells and indicators of inflammation.

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