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Cardiology patient page. Fainting.

The concept of fainting (also known as blacking-out, passing-out, or in former days, swooning) is generally well understood by the public. In fact, most people so readily accept fainting that fainters often seek medical attention only after several episodes have occurred. This apparent lack of concern possibly arises from the fact that about 30% of the population have survived a faint, whereas many others may have observed friends or associates recover spontaneously from faints. Nevertheless, few understand why fainting occurs, what the common causes are, and when and how faints should be evaluated.