question: Hi, I am 24 years old, non smoker, female. 3days ago, I started to feel air bubble in my left chest ( between 2nd and 3rd rib, not lateral part, just close to sternum). I am also a junior doctor and so I auscultate myself and I found out that at the end of deep inspiration, I heard musical sound like rhonchi, not sure though. But it doesn t happen all the time, but often. For the past medical history, I took anti TB last year. What can it be? Please reply me. I am worried!