If your mucus is gray or black... …you likely inhaled dark-colored particles, like smoke from a fire or heavy exhaust. Regular smokers can also blow out darker mucus because of the tar or other toxic ...

However, one clue you might need antibiotics is persistent thick, green discharge ... burst blood vessels in the nose. Black: This could be old, dried blood. The mucus can also turn black when ...

Whenever the cold and flu season comes along, it is common to hear those around you – at home or at the workplace – struggling with the discomforts of a runny nose ... thick, hard-to-clear ...