What does GREY phlegm mean?

Related questions

1. Is milk good for pneumonia?
2. Is it bad to swallow phlegm?
3. Can you poop out phlegm?
4. Can you get pneumonia from being cold and wet?
5. Can u die from pneumonia?
6. What is the difference between a chest infection and pneumonia?
7. Is coffee good for pneumonia?
8. What is the main cause of pneumonia?
9. Do I need to go to hospital for pneumonia?
10. How do you get the mucus out of your lungs?

Tags

1. #coughing
2. #pollutants
3. #trying
4. #smoking
5. #large
6. #amounts
7. #excessive
8. #causes
9. #discharge
10. #inhalation
11. #leading
12. #meanwhile
13. #stagnate
14. #resins
15. #mucus
16. #phlegm
17. #accumulated
18. #white