 [ Symptoms ] i am spittimg up yellow stuff i start coughing and i cough up yellow stuff my mouth then taste like i have eaten soething that was scorched [ Disease ] dark yellow phlegm could be a sign of an infection or at least stagnation of mucous in your nose sinuses or lungs the fact that it is foul tasting is another sign of a possible infection the color of mucous is not as important is the entire package of symptoms that you may be experiencing so if this continues you may need to see a medical evaluation in the meantime drink plenty of water this will thin your mucous humidify the air humidifier or a hot steamy shower and consider trying a decongestant during the day if the underlying cause is a cold viral then you should be improving in a few days if you are having sinus pain sore throat chest pain or fever then it would not be prudent to wait it out