The color of the phlegm from patients with the lung disease bronchiectasis can indicate the degree of inflammation in their lungs and predict their future outcomes, according to new research presented ...

Phlegm is naturally clear. So, if your phlegm is a different color, such as yellow or green, you may have a viral or bacterial infection. Brown, red, or black phlegm may be a sign of a more serious ...

As the icy weather approaches, many start coughing and spluttering while they battle winter colds and flu. Although for most coughing up mucus is part of the cold season, coloured phlegm can be a sign ...