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Just because you don't have any physical symptoms of cardiac problems doesn't mean you don't have any problems -- for example, 30% of the time, the first symptom of coronary artery disease is sudden death. Even if you're still young, have yearly checkups, complete with cardiology workups.
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Cardiology experts point out that risk factors for cardiac disease include a history of stroke or heart disease, diabetes, obesity, high blood pressure, a sedentary lifestyle, high cholesterol, and a history of smoking. If you're prone to any combination of these items, consider yourself high risk.