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Lifestyle factors also play a critical role in heart attack prevention and recovery . Rarely , a heart attack can occur when a blood clot from inside a diseased heart breaks loose and lodges in a healthy or narrowed coronary artery . It takes longer than normal for the passengers to board the first bus that arrives , so the bus behind it catches up a little . Make sure there 's a half-inch of space between your longest toe and the inside tip of your shoe . In effect , they capture the degree of similarity ( or disparity ) among products within a brand and across different brands in the same category . These drugs , also called clot-busters , help dissolve a blood clot that 's blocking blood flow to your heart . But in a small number of cases , headaches may be a symptom of a blood clot or brain tumor .