For the last 2 years I've had a problem with coughing up yellow/white phlegm almost exclusively in the mornings. I've always been 'that guy' who seems to regularly catch a cold, and since having this problem, my colds seem to affect my nose less (although it is usually still blocked to some extent). When catching a cold, the cold seems to go in a week or two, but coughing up phlegm will usually stay to some extent for about 6 weeks. Usually by the time it goes, it isn't long until I catch another cold! As I said at start, this is usually only when I first wake up, then I'm fine for the rest of the day.
As a bit of background, I used to have Pectus Excavatum (http://en.wikipedia.org/wiki/Pectus_excavatum) before having the NUSS procedure. I had mentioned the mucus problem to my surgeon and he believed it may have been a symptom of P.E, however since having the operation 5 months ago, I'm still having this problem.
I've mentioned it to docotors as a side note on a few visits, but none have ever seem too concerned. Has anyone got any ideas?