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What Are the Signs and Symptoms of a Heart Attack? - 
NHLBI, 
NIH
What Are the Signs and Symptoms of a Heart Attack? 
Not all heart attacks begin with the sudden, 
crushing chest pain that often is shown on TV or in the movies. 
In one study, for example, one-third of ...
http://www.nhlbi.nih.gov/health/health-topics/topics/heartattack/signs.html