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you can confirm it by stress test and 2DECHO to rule out if you have a heart problem.It will be a big help to you to ease your worry.

yes u can have a heart attack and not know it my mother had several what they call silent heart attacks they say females are prone to the silent ones. no pain and you may hardley notice anything is wrong maby a little discomfort you may mistake as heartburn. your dr. should be able to tell you more. check with him for answers.

Unfortunately, many people have had heart attacks and not known it. You might have been uncomfortable and just not realized what was happening. It doesn't mean that you've had a major heart attack. When my mom had one of her last EKG's she was put in the hospital for an angiogram and the next thing we knew, she was having quadruple bypass and she never had any signs of trouble. She also had a few unknown heart attacks, one that put a 1/4 of her heart into "hibrenation" which thankfully came back after she had the bypass.