Depends. When you continue to have breathing problems after evaluation by your primary care physician. Also, when there are abnormalities on x-rays and ct scans. There are many other reasons, but these are the common ones.
Lung problems. Hi Paige, if you are having breathing issues, chronic cough, or decreased ability to exercise you should see your primary care physician. After an initial work up with possibly a chest xray, lung function tests, and/or blood tests, and it is determined you have lung disease, then you will likely get a referral to a pulmonologist. Primary care doctors are very good at doing the initial work up.
Breathing problems. For any concerns related to your lungs and breathing.