If you’re coughing up brown mucus, though ... the bronchial tubes which carry air from your nose to your lungs). Black mucus can materialise after inhaling dirt or dust; or after smoking ...

That's right, the color and consistency of your nasal discharge or what you cough up can shed some light ... dust and/or soot ...

You may cough up blood-stained phlegm that is thick and dry in consistency. This phlegm may be yellow, green, or brown in color. How to treat it: Some cases of pneumonia can go away on their own ...