If you’re coughing up brown mucus, though, you should see a doctor because this could be a sign of bronchitis (or inflammation of the bronchial tubes which carry air from your nose to your lungs).

To many people, mucus is nothing more than a gross goo, something to be tossed away in a tissue immediately after clearing your throat or blowing your nose. To scientists, it’s nothing short of a ...

Your nose is built with a fantastic gooey substance called mucus, and we produce close to a liter of it every day. I'm getting there now. Every breath you take is filled with dust, dirt ...

A build-up of bacteria may cause mucus that is green without making you sick. You may wonder whether you need antibiotics if you blow your nose and notice your snot is green. Antibiotics only ...

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 ...

Brown explained that when nasal filtration ... a well-hydrated mucus layer which helps to keep the nose humidified and clean.