And the color and consistency of nasal mucus can reveal intriguing details ... as your immune system starts mobilizing against invaders. Yellow mucus indicates your immune system is actively ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Having a congested chest can ...

Producing mucus ... yellow or green snot, but if it persists for seven to 10 days, then you probably should let your doctor know. That may mean that you have developed a bacterial infection, sinus ...

If your mucus is gray or black... …you likely inhaled dark-colored particles, like smoke from a fire or heavy exhaust.

If your child has white mucus for more than two weeks, is a teenager, or develops sinus pain, fever, or other symptoms, they could be getting an infection. When your child has yellow snot, it's ...

And the colour and consistency of nasal mucus can reveal intriguing ... as your immune system starts mobilising against invaders. Yellow Yellow mucus indicates your immune system is actively ...

And the colour and consistency of nasal mucus can reveal intriguing ... as your immune system starts mobilising against invaders. Yellow mucus indicates your immune system is actively fighting ...