Is coughing up green phlegm a sign of
- is coughing up green phlegm always a sign of infection
- is coughing up green phlegm a sign of a chest infection
- is coughing up green phlegm a sign of lung cancer
- is coughing up green phlegm a sign of pneumonia
- is coughing up green phlegm a sign of getting better
- is coughing up green phlegm a sign of infection
