Noticed this several times recently, have strange light feeling in chest occasionally. When I breath in my heart beats lighter and faster.. when I breath out it beats heavier and slower. Every time, all the time. Do I need to see a doctor?
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Your hear is using the oxygen that your lungs just provided to your blood, by pumping faster.
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Try articles on respiratory sinus arrhythmia on wickipedia. This is a normal process but if you are aware of it (you can feel it), it might not be a bad idea to check in with a doctor.
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