At first I thought it was I cold I caught from my boyfriend. I've been coughing up phlegm with the consistency of slime in one of those science kits they have for kids. Up until just now, it's been yellow-green-ish, but I've been coughing up less and less if anything, and it's starting to hurt more and more. a few minutes ago, I coughed up tiny bit of white phlegm with a little of red in it, then again a few seconds later. Right now, my coughs are non-productive, and hurt my lungs and throat.