I am having slight pain in my left lung when I breathe in. The first time I got it was like 4 - 5 days ago. The pain goes away own its own and sometimes I get it at night for sometime. It feels like I have allot of mucus in my lungs that I want to throw out but I can't just cough it out because it seems stuck. I have been getting blocked nose and other cold symptoms now and then continuously for the past month. But that is probably because (what doctors say) an abnormal nose bone which has to be surgically fixed. I get cold the most whenever I compare it to my friends. But this is the first time that I have so much mucus in my lungs that I feel congested and its not going away. Please help its scaring me out. Also I used to be a regular smoker for 4 months but since I'm having this pain I have quit smoking.