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Ask Dr. Oz: Is it True that a Person's Risk of Having a Heart Attack Increases in Winter?
There are several reasons for this effect: The cold causes your blood vessels to constrict, which raises your blood pressure. And as blood cools, it thickens, making clots more likely. Plus, as the temperature goes down, your heart has to pump harder to keep your body's thermostat turned up.
Seasonal flu is another risk factor. It may make arterial plaque unstable, blocking blood flow. Finally, keep in mind that the physical exertion of shoveling snow can worsen the burden on your heart. My recommendations are to stay warm, get a flu shot, and try not to overexert yourself.