Mucus.

If you feel unwell and are struggling with a respiratory illness, you may cough up red mucus. Red phlegm or mucus is a sign that blood has been...

Coughing up mucus can be confusing, especially if you are not sure that you’re sick. Mucus protects your respiratory system with lubrication and filtration. How do you know...

When your body produces so much phlegm that you are coughing up sticky, thick goo, it can be frustrating and feel a little gross. But mucus is actually...