Acid reflux can do this.
Aggravaged by exercise, small amounts of acid get into the lungs.
This can be the only symptom.
Early heart failure can do this. Very mild compromise of the left ventricle. You give you history to indicate this.
New asthma can do this [adults get asthma].
Environmental exposures that you are sensitive to.
Infection is the last on my list.
Just based on your description.
However, why not ask for pulmonary function testing, an EKG and a chest x ray?
That would exclude a number of problems.
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