I would suggest a referral to a pulmonary physician. There are many causes of shortness of breath. This can include asthma, restrictive or obstructive lung disease, heart disease, post-nasal drip, or GERD to name just a few.
I would first suggest full pulmonary function tests as well as a chest X-ray. This can evaluate for most obstructive and restrictive lung dieases. Essentially this test involves blowing into a machine to determine lung function. A plain X-ray should be done and a CT scan considered if further imaging is necessary.
If the lung function is normal, heart causes can be considered - including exercise stress testing, an echocardiogram or cardiopulmonary stress testing.
In terms of a course of action - I would suggest a referral to a lung specialist. Next steps would be dependent on the results of the tests suggested above.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Thanks,
Kevin, M.D.