 [ Symptoms ] i have been coughing constantly for a few days now and just started coughing up a little bit of blood at first i thought it was i cold i caught from my boyfriend i have been coughing up phlegm with the consistency of slime in one of those science kits they have for kids up until just now it is been yellow green ish but i have been coughing up less and less if anything and it is 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 [ Disease ] sounds like you have a sinus or chest cold if the blood is just thin streaks then i do not think theres much to worry about nothing that a round of antibiotics would not cure and if you smoke stop if if more than streaky blood in your sputum [mucus flem] seek medical attention immediately these could be signs of a more serious condition