I have a very fast heart rate. Doctors don't know why. 3 years ago i had a sonogram/ekg and it came back normal. My chest will hurt really bad when running. If i do a little exercise my heart will beat really fast and it will take me a while to catch my breath, well i'm not out of breath, just feel light headed. the back of my head will start hurting. What do you think is wrong?
Why does my heart beat so fast?
- Thread starter Koral
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