I'm wondering why I sometimes have a whistling sound when I breathe and why people say I breathe heavily. I've always struggled to control my breathing, even during yoga, and I get out of breath when climbing stairs. People often say it's because I'm overweight, but even when I wasn't, I still had these breathing issues. Could there be another reason for this?

Patient is advised pulmonary function test (PFT)and a chest x-ray .