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 ...

If you’re blowing your nose regularly, it’s hard not to notice your mucus—and what color it is. So it can also be alarming if you happen to spot yellow, brown, bloody, or green mucus in your used ...

When a person has black or dark-colored mucus, they may have inhaled potentially harmful pollutants. Coughing up black mucus may also be due to an underlying infection or condition. Mucus serves an ...

I’m guessing you haven’t spent much time thinking about mucus recently. Sure, some of you with allergies or colds probably have, but not in a sort of optimistic way. Well, good news, there are ...

Mucus consists mainly of water and a gel-forming molecule called mucin. The body uses mucus to protect tissues, remove particles, and prevent infections. Mucus is essential for the functioning of many ...

Medically reviewed by Susan Russell, MD Key Takeaways Coughing up white mucus can signal an upper respiratory infection or chronic conditions like COPD.Viral infections causing white mucus can't be ...

Open your tissue, if you dare. The color of your snot can reveal a lot about your health. The nose is lined with mucus membranes that secrete snot to help keep tissues healthy and trap dirt, cleaning ...

Add Yahoo as a preferred source to see more of our stories on Google. The color of your mucus can reveal some surprising things about your health. (Photo: Getty Images) (Getty Images/iStockphoto) ...