8. Rapid or irregular pulse. Doctors say that there’s usually nothing worrisome about an occasional skipped heartbeat. But a rapid or irregular pulse — especially when accompanied by weakness, dizziness, or shortness of breath — can be evidence of a heart attack, heart failure, or an arrhythmia. Left untreated, some arrhythmias can lead to stroke, heart failure, or sudden death.

9. Shortness of breath. People who feel winded at rest or with minimal exertion might have a pulmonary condition like asthma or chronic obstructive pulmonary disease (COPD). But breathlessness could also indicate a heart attack or heart failure.

“Sometimes people having a heart attack don’t have chest pressure or pain but feel extremely short of breath,” Goldberg says. “It’s like they’ve just run a marathon when they haven’t even moved.” During a heart attack, shortness of breath often accompanies chest discomfort, but it can also occur before or without chest discomfort.

10. Sweating. Breaking out in a cold sweat is a common symptom of heart attack. “You might just be sitting in a chair when all of a sudden you are really sweating like you had just worked out,” Frid says.

11. Swelling. Heart failure can cause fluid to accumulate in the body. This can cause swelling (often in the feet, ankles, legs, or abdomen) as well as sudden weight gain and sometimes a loss of appetite.

12. Weakness. In the days leading up to a heart attack, as well as during one, some people experience severe, unexplained weakness. “One woman told me it felt like she couldn’t hold a piece of paper between her fingers,” McSweeney says.

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