…your body is using many reinforcements to fight the infection, and perhaps it’s losing the battle. This is especially true if your mucus has been green for a few weeks or longer. If that’s the case, you should see your doctor; especially if you have a fever or feel nauseated.
Brown Snot
When blood from your nasal lining dries, it can mix with the mucus and turn brown. But brown mucus isn’t always because of blood. It could also be dirt, dust, discoloration from cigarette smoke, snuff, or a spice. If you’re coughing up brown mucus, though, you should see a doctor because this could be a sign of bronchitis.
Black Snot
Black mucus can materialize after inhaling dirt or dust; or after smoking cigarettes or marijuana. But it can also signal a serious fungal infection, especially if you have a compromised immune system. If your mucus is black for no obvious reason, you should see a doctor. This is especially true if you have a fever, chills, or have difficulty breathing.