Unlikely to be heart: Good for you that you decided to take exercise seriously. Though not impossible, heart disease is unlikely in a 21 yr old woman. If you're out of shape the increased work of breathing and fast heart rates during exercise can feel uncomfortable in the beginning. But as you get fitter, that discomfort goes away.
Answered 8/31/2013
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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