So here I am about 20 minutes ago sitting at my desk breathing (as one would to stay alive) and as I breath out I am suddenly in awful pain and my left lung is really quite painful. I couldn't take a full breath at this point as it was very painful to try and it took me 5 minutes to pluck up enough balls to take a full breath.
Once I had taken a full breath I felt and heard a rather quite audiable pop from my left lung and hey presto everything is fine now!
I'm not a smoker, I'm not over weight (quite skinny to be fair), I am a singer so my lungs do get a good exersice (not to mention the rest of my body) I have never had any breathing issues before.
One off thing or should I be worried? Anyone else had a similar thing more to the point?