I have suffered shortness of breath problem before 10 days. When i work and that time rest i have feel shortness of breath. My shortness of breath is comes and goes in month and feel better in 3 to 4 months. And revers this problem. When i go to the chest physican dr he told you do not have problem he told to some test spirometry and chest x-ray both have normal. But whay i have sortness of breath and he is revers.