You might want to hold off with that wish. Phlegm is positively good for you. Well, not the thing itself, but what it represents. Phlegm is mucous that becomes congealed and visible. It's practically always a sign of your body fighting off whatever infection is wreaking havoc on your respiratory system - which is positively a good thing. Phlegm is primarily composed of mucous, dead bacteria and virus, dead white blood cells, and assorted tissues...
