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Hearts attacks are often caused by a build-up of cholesterol, which narrows arteries. They occur due to blood clot blocking the flow of blood through a coronary artery " a blood vessel that feeds blood to a part of the heart muscle. Other factors that raise the probability of a heart attack are age, tobacco, high blood pressure, family history (i.e. genetics), physically unfit body, obesity, stress, illegal drug use and so on.

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