Half of all heart attacks have no symptoms
Nearly half of all heart attacks may have no symptoms at all — but that doesn't mean they're any less deadly than heart attacks with symptoms, a new study finds. "Silent" heart attacks account for 45 percent of all attacks in the U.S., according to the study, published today (May 16) in the journal Circulation. In addition, the researchers also found that silent heart attacks raise a person's risk of dying from heart disease by three times, compared with if they had not had a heart attack.

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