I am a 39 year old female athlete.  I run duathlons, play several sports, and lift weights.  I am a little heavier than I should be and have been that way all me life, even as a collage athlete.  I was diagnosed with a heart murmer years ago, but have never had any major issues.  Within the last few months, when I am at rest, I get a quick flutter in my chest that makes me cough.  It does not hurt, it just startles me.  I ran three miles today, and about 4 hours later it happened.  I had an EkG two months ago and everything was fine.  Should I still be concerned?
Thanks for your question on Chat Doctor. I can understand your concern. Fluttering sensations in chest is commonly seen with arrhythmia (rhythm disturbances in heart). Normal ECG can not rule out arrhythmia. So better to get done Holder monitoring (24 hours continuous recording of ECG). If this is normal then no need to worry about arrhythmia or heart diseases. Sometimes, simple muscular spasm can also give feeling of Fluttering in chest. So don't worry much get done Holder monitoring to rule out arrhythmia. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.