This cold and flu season, you may be looking for clues you're getting better anywhere you can find them, even in the color of your snot.

Mucus is usually clear when you're not sick. So it can be startling when your boogers are suddenly as yellow as the sun. Though it might give you the ick, your mucus isn't changing colors out of ...

A lot of people think yellow or green snot means you need an antibiotic. That is not true. Laura Martin, MD, MPH If it's a viral infection causing the yellow or green snot, yellow in particular is ...

When a white blood cell finds a germ, it latches onto it. Then it changes its shape to surround the germ. You can imagine the ...

Phlegm might seem like an everyday nuisance, but it can serve as a critical indicator of your body’s respiratory and systemic ...

Julia Calderone wrote an earlier version of this post.

you’ve likely examined your mucus color, from yellow to green, for signs you may be healing. “We are in the midst of one of the most severe flu seasons in the past few decades, and it is ...