Black mucus is rare. It can be the sign of a fungal infection, or exposure to pollutants such as coal, dust or cigarette ...

Mucus isn't exactly something people give much thought to — until they're sick and dealing with a constantly runny nose. But mucus is actually an important part of a healthy immune system, according ...

Coughing up mucus may be a sign of a respiratory infection or lung issue. The color of the mucus may help inform what’s going on. Coughing is a natural reflex. It’s your body’s way of clearing your ...

A cough that produces mucus, or phlegm, is known as a wet — or productive — cough. Producing mucus while coughing is typically a response to allergens and irritants, airway infections, or an ...

Coughing up white mucus can be a sign of an upper respiratory infection or chronic conditions like COPD. Viral infections that cause white mucus cannot be treated with antibiotics, so focus on rest ...

Phlegm. Mucus. Sputum. These are different names for the slimy, slippery stuff that flows out when you cough, sneeze, or sniffle. This gunk is your body’s defense weapon against infectious microbes ...