<s>[INST] i washaving pain on my left side of my chest weeks ago...and now i am having pain...left side  below ribs..i even have problem in breathing ...i have to take half breath and leave it...i am scared.....my friends say my lung has collapsed....i cant belive them....what can it be [/INST] Hi welcome to Chat Doctor. Here according to history conclusive diagnosis cant made . Your physical examination including auscultation needed .... It could be emphysema, bronchitis like cause if having habit of smoking .... Sometime if having hypertension history than heart failure could because ... Investigate with .....1. Chest x-ray 2. Spirometry 3.EKG According to cause treatment given Like that if bronchoconstriction present than bronchodilator given in form of inhaler ... If no cause found than HE estimation done for rule out anemia Take care Avoid stress and smoking ... Advise : consult pulmonologist and discuss all this </s>