Why I have chest tightness, difficulty breathing

Expert Reply
Condition analysis:
Clinically, most patients with COPD usually have breating difficulties and chest pain. But if you have had  pulmonary and heart function test, and found no problem, then it means that you are too sensitive, resulting in stress or anxiety. So if you have had all the relevant test done, and there is still no problem, it is necessary that you need to find an anti-anxiety treatment.