Hi all..as said previously, I havent had any of the tests im being told that are used to diagnose COPD, but was diagnosed COPD Unspecified. I have been spitting out yellow/green phlegm more often, even when I dont cough. We were at a higher altitude this past weekend, not too high about 1,000 ft higher than home. In the morning my cough was non stop and i was full of phlegm there. Does this happen with COPD?