Bloody, brown, white, yellow, or green phlegm may be a sign of an underlying condition or infection. Viral and bacterial infections, allergies, and respiratory illnesses can cause phlegm as a symptom.

Drinking warm fluids like tea can help loosen thickened mucus in the lungs. Inhaling moist air using a humidifier or steam can make it easier to cough up and remove lung mucus. Controlled coughing ...

Mucus, or phlegm, is a thick, slippery substance secreted by glands and cells in your body. It's important to your immune system because it traps microorganisms, dirt, and other particles that shouldn ...