Several reasons: Normal ecg/lung function tests are good for screening, if u still have shortness of breath, more tests can be performed as stress tests / challenge tests, u have a thyroid problem as well, hypothyroidism can lead 2 overweight, decreased activity and easy fatigue which can be interpreted as shortness of breath, also anemia, low blood pressure, etc further evaluation is needed if condition persists.
Answered 11/29/2013
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